Electrical Engineering Reviewer

Electrical Engineer (Protection and Control)

2011-09-08T23:30:00.001+08:00

Electrical Engineer (Protection and Control)
Work Description:
As part of the SNC-Lavalin group of companies, SNC-Lavalin T & D designs, develops, and delivers engineering, including system planning and studies, procurement, and construction solutions for high voltage power transmission line and substation projects in Alberta, British Columbia, Ontario and abroad, from our Canadian and Brazilian offices.

SNC-Lavalin T & D has exciting full time career opportunities for Junior, Intermediate and Senior Engineers to join our team in the area of Substation protection and control for High Voltage substations. Based out of our Calgary, Vancouver and Toronto offices, our Electrical Engineers (P&C) are responsible for protective relay settings and for the delivery of Protection & Control systems for our high voltage substation projects.

The Electrical Engineer (P&C) is required to work within a multi-discipline team to develop efficient and reliable Protection & Control systems. The incumbent will coordinate his/her design activities to maintain project schedules and ensure successful project completion. The incumbent will also assist the Estimating Team in preparation of estimates and project proposals.

This position is accountable to provide design activities in accordance with applicable codes and standards, including SNC-Lavalin’s policies and procedures, such as Safety, Environmental, Quality Assurance and Quality Control.

Additional accountabilities for the Electrical Engineer (P&C) include:
• Prepare conceptual design of the complex projects.
• Carry out/review/analyze complex technical studies and project scopes.
• Develop and review technical specifications, drawings and standards of equipment/ projects.
• Review the design based memorandum, detailed engineering scope and guide the assigned discipline engineers to align the engineering deliverables according to project requirements.
• Work closely with peers to ensure accurate delivery and thorough electrical design that will meet industry standards and specifications, and meet good engineering practices.
• Maintain complete project documentation with respect to engineering studies and calculations, all design packages, as-built requirements and return data information.
• Maintain good working relationship with internal groups that support project such as other Engineering disciplines, Drafting, Procurement, Construction and Project Management etc.
• Selection of equipment and material and preparation of specifications for material, equipment, construction and installation work.
• Develop relay setting calculations and coordination report.
• Review of internal and external designs for code compliance, good design practice and constructability.
• Coordinate design activities with other multi-discipline project team members.
• Construction support including resolving site queries, attending site meetings and performing site inspections during the construction phase of projects.
• Maintaining complete project documentation with respect to relay settings and calculations, all design packages, as-built requirements and return data information. Maintaining good working relationship with internal groups that support projects such as other engineering disciplines, Drafting, Project Management etc.
• Mentoring and providing guidance to developing engineers within the department.

Qualifications for the positions include:

Junior:
• A degree in Electrical Engineering from a recognized institution.
• Eligible for registration with APEGGA (Alberta), PEO (Ontario), or APEGBC (British Columbia).
• 1 – 2 years experience in substation protection and control design.

Intermediate:
• A degree in Electrical Engineering from a recognized institution.
• Eligible for registration with APEGGA (Alberta), PEO (Ontario), or APEGBC (British Columbia).
• A minimum of 5 years experience in substation protection and control design.

Senior:
• A degree in Electrical Engineering from a recognized institution.
• Eligible for registration with APEGGA (Alberta), PEO (Ontario), or APEGBC (British Columbia).
• A minimum of 10 years experience in substation protection and control design.

Additional Qualifications for the positions include:

• Experience on MathCAD, ASPEN or ETAP software is an asset
• Experience on PSCAD or EMTP software is an asset
• Experience on relay setting and coordination is an asset
• Experience on SVC, Series Compensation and/or HVDC converter stations is an asset
• Knowledge of modern power system, power system protection and relay technologies.
• Strong client focus.
• Knowledge of Canadian and Alberta codes and standards, including OH&S Regulations, CSA and AECUC codes is an asset.

Electrical Engineer (Mining) - Senior or Intermediate

2011-09-08T23:29:00.006+08:00

Electrical Engineer (Mining) - Senior or Intermediate
Description:Our client, a consulting engineering firm, is looking to add an Intermediate or Senior Electrical Engineer for it's Oakville area location.

Work will include:
· Designing electrical systems
· Design of cable trays, lighting systems, heat tracing, grounding systems
· Equipment selection
· Interpret system requirements and create schematics
· Should have related heavy industry experience, preferably Mining

Candidate must be a Professional Engineer in the province of Ontario, with a minimum of 10 years as above.

To apply email your resume in confidence to Nureen Qureshi nqureshi@dg.ca

Only qualified candidates will be contacted
Please visit www.dg.ca for a complete list of open positions.

Senior Electrical & Instrumentation Engineer

2011-09-08T23:29:00.004+08:00

Senior Electrical & Instrumentation Engineer
Description:
Design Group Staffing is currently recruiting for an Electrical and Instrumentation Engineer for our local Edmonton company.

Job description:

· Provide technical support for Electrical & Instrumentation system engineering design of the plants & equipments, design reviews, evaluations and safety studies
· Prepare functional specifications for any modification/replacements in the area of electrical and instrumentation system
· Provide technical support for troubleshooting of problems at running plants, commissioning and construction activities
· Ensure technical integrity of the power generation and distribution systems
· Standardise electrical & instrumentation specifications for all modifications and new developments
· Review & update the plant maintenance philosophies/ procedures in accordance with the business needs and safety standards
· Evaluate spares consumption & requirement and help field staff in inventory optimisation
· Perform reliability & availability analysis and suggest improvements Assist development of projects & contracts scope of work supply, tender documents, selection of vendors & contractors, project completion, close out and lessons learned report

Requirements Senior Electrical & Instrumentation Engineer

· B.Sc. or Master Engineering degree having minimum 10 years of experience in Oil & Gas industry with minimum 5 years experience of Electrical/Instrumentation design
· Experience of being active participant in conceptual/FEED studies under capacity of overall coordinator capturing design deliverables
· Knowledge of Electrical & Instrumentation engineering design documents e.g. equipment specifications, instrument & control loop diagrams, instrument calibration & certifications, SLDs, Electrical equipment specifications, hook-ups, ESD system, TDC, PLC, MTO etc.
· Knowledge of engineering reviews, HAZOP, other safety studies and hazardous area classifications
· Knowledge of gas processing plant maintenance & experience in working with contractors
· Thorough knowledge of safety in plant maintenance operations, maintenance strategies like RCM, RBI, TPM etc.
· Familiar with applicable international standards, Plant design specifications & philosophies, statutory regulations & requirements for safety & environment

Interested candidates should submit their MS Word format resume to Taryn Gantar at tgantar@dg.ca for consideration.

Electrical Engineer (Mining) - Senior or Intermediate

2011-09-08T23:29:00.001+08:00

Senior Electrical & Instrumentation Engineer

2011-09-08T23:28:00.004+08:00

Senior Electrical & Instrumentation Engineer

2011-09-08T23:28:00.001+08:00

Electrical Systems and Controls Engineer

2011-09-08T23:27:00.002+08:00

Electrical Systems and Controls Engineer

About Us

GE Energy – Motors Division, Peterborough; Large Motors and Generators manufactures engineered-to-order AC & DC motors for variety of industrial applications including petrochemical production, mining, steel mills and air separation. Motors up to 75,000 HP and generators up to 2,000 KW have been designed and built at this site. We are a world leader in providing high value, custom, large motor solutions, leveraging premium technology and quality. This is a Canadian custom design and manufacturing facility with a global product mandate. We offer a competitive salary and benefits package, and the professional advantages of an environment that supports your development and recognizes your achievements. We are an Equal Opportunity Employer. Located an hour’s drive north-east of Toronto in the beautiful Kawartha Lakes Region, Peterborough boats an extraordinary quality of life, outstanding educational facilities (Trent University and Fleming College) and a 500-bed Regional Health Centre. A vibrant arts and cultural community, exceptional sports facilities and programs for all ages, and an expanding regional retail/commercial base to make Peterborough a special place to work, live and call home.

Essential Responsibilities

* Working from customer’s written or verbal specifications, specify and apply Variable Speed AC Drive Systems, Medium and Low voltage Switchgear, MCC’s and related equipment, and / or
* Carry out Power System Analysis, Motor Starting Studies, Protective Relay Settings and Co-ordination, Harmonic Analysis and Power Factor Correction, and / or
* From a solid foundation of engineering expertise, develop and upgrade existing control and power equipment to the standards and functionality required for today and tomorrow, to keep GE in the foreground of technical innovation
* Design and /or apply PLC or other digitally-based variable voltage power conversion excitation control systems for custom-built large synchronous machines up to 70 MW.
* Plan, coordinate, and provide technical and project guidance to engineering team members in various global locations.
* Provide technical support to CAD, manufacturing, test, and commissioning and service personnel.
* Provide technical support to sales and marketing personnel in the pursuit of new business opportunities.
* Provide leadership in advancing the competitive position of GE’s large motor and generator products through continuous improvement of product designs and design processes, or the application of new techniques and technologies.
* Support GE’s four main initiatives: globalization, services, digitization, and Lean-Six Sigma quality.
* Work with other GE teams in the integration and development of advanced monitoring of motors and control systems to enhance the sales of post-warranty service.

Qualifications/Requirements

* Bachelor or Advanced Degree in Electrical Engineering, or equivalent qualifications and experience.* Advance degree in EE, or equivalent experience* 5 years or more of related experience * Knowledge of, and experience with large industrial electrical applications, including AC drives.* Knowledge of large synchronous and induction machines.* Strong overall technical skills.* Ability to achieve excellent performance in individual and team environments.* Demonstrated ability for on-time performance in a high-pressure work environment.* Demonstrated excellent communications and people skills.* Strong pro-active performer who will establish a network of experienced engineers to widen his / her knowledge base.* Eligible for PEO (PE) certification as a licensed professional engineer, or already certified.

Senior Electrical Engineer

2011-09-08T23:26:00.005+08:00

Senior Electrical Engineer
Work Description:

Cronos Consulting Group is an Engineering Search firm. We headhunt for stellar individuals within these sectors: Infrastructure (Transportation, Water, Energy), Mining, Consulting (all disciplines), Power Generation (hydro, nuclear and renewable – wind, solar etc), Environmental and Petrochemical.

If you are poised for a new opportunity in Engineering in Canada, please visit us at www.teamcronos.com">http://www.teamcronos.com/">www.teamcronos.com or call us today!

Position Summary:

We currently have an opening for a Senior Electrical Engineer. The Senior Electrical Engineer will have experience in managing all aspects of the electrical design of projects. They will also direct the activities of other electrical personnel on the project.

Duties/Responsibilities:
Development of designs, drawings and calculations with minimal guidance from other senior staff.
Checking of design drawings and calculations against layouts, electrical one line diagrams, AC control schematics, wiring distribution schemes and others.
Development of cable block diagrams and cable and conduit schedules.
Design of physical layout of electrical equipment, raceway and grounding plans related to the facility.
Design and development of electric heat tracing systems.
Field verification and preparation of As-Built update of construction drawings.
Experience in field inspection and acceptance testing of electrical equipment, and provide technical support to Construction and Commissioning groups.

Work Requirements:
A minimum of 10 years experience as an Electrical Engineer.
P.Eng or are eligible for registration, with an undergraduate degree in Electrical Engineering.
Experience on commercial and industrial projects; both as a Lead Electrical Engineer and a Project Manager.
In-depth knowledge of all aspects of electrical engineering facility design

Electrical Design Engineer in Canada

2011-09-08T23:26:00.002+08:00

Electrical Design Engineer in Canada
Company Name: Aerotek Automotive
Work Location: Oshawa, ON L1G7R5
Work Position : Full Time, Temporary/Contract/Project

Work Description

Responsible for developing current and future engineering designs for Regional and Global markets in the area of battery thermal testing/analysis/design. Specifically, generates novel project ideas, develops and executes advanced technology projects. Must be a self-starter with experience in non-standardized test design, execution and analysis.

Work Required Qualifications
- BSc in Engineering or higher, Electrical Engineering background preferred
- Strong understanding of power electronics
- Strong understanding and experience in the theory and execution of design for thermal, electrical & mechanical requirements
- Experience in designing, setting up and executing non-standardized testing
- Knowledge and experience in high voltage electrical systems and test equipment, electronic controls, battery system performance and data communication
- Knowledge and experience in programming languages required to execute laboratory testing such as LabVIEW, Matlab/Simulink
- Understanding of engineering theory and principles of design
- Technical hands-on experience, analytical and detail-oriented
- Demonstrated interpersonal, troubleshooting and presentation skills
- Good planning and execution skills
- Stays abreast of new technology and competitive products
- Travels as required

Job Preferred Qualifications
- Knowledge of Lithium Ion battery performance
- Automotive background
- Experience with data acquisition systems and sensors

Required Skills:
Knowledge Lithium Ion Battery, Knowledge of Matlab/Simulink, Labview, Knowledge of Power Electronics

Intermediate/Senior Electrical Engineer or Designer in Canada

2011-09-08T23:23:00.002+08:00

Intermediate/Senior Electrical Engineer or Designer in Canada
Location: Canada

Work Description:

Design Group is currently recruiting for an IMMEDIATE requirement for Intermediate/Senior Electrical Engineers or Designers to work for in Edmonton for an EPC company. This is a long term contract position or possibly permanent.

Job Description:

A recognized degree/diploma in an engineering discipline, from an accredited college or university.
Specialized courses in an engineering discipline, engineering design and practice, and; practical work experience to the degree necessary to perform the responsibilities below. This work experience to be in design engineering.
Intermediate to advanced computer skills.

Duties:

Plans, coordinates or prepares equipment or work specifications, bid evaluations and award recommendations for equipment.
Coordinates engineering efforts in assigned areas between specialty and other engineering groups or disciplines, with the client, suppliers, and contractors and between other groups.
When delegated, assumes a lead technical role over other engineers or project subgroups for completing specific tasks.
Assists in on-the-job-training of assigned personnel and provides input for their performance evaluations.
Prepares or assists in preparation of conceptual studies, designs, reports or proposals.
Performs or assists in the performance of problem analysis and original design.
Prepares and/or assists in the preparation of cost estimates, quantity take-offs and staffing requirements for proposals, forecasts and change orders.
Supports the creation of a work environment that fosters openness, trust, communication, teamwork, empowerment, innovation, and satisfaction.
Working knowledge of precedents in the specialty area, the principles and practices of related technical areas and of coordinating work with other technical disciplines.
Understands the standard engineering work planning, scheduling and cost estimating, and conducts independent work requiring judgment in the application of engineering techniques. Normally uses conventional approaches to technical problems encountered.
Provides technical direction, assigns/reviews work of engineers, designers, and drafters who assist on specific assignments.
Knowledgeable of and performs standard discipline engineering activities on projects of medium size with minimal technical oversight.
Coordinates technical issues with other departments on projects including constructability requirements and reviews.
Designers

Work expirience:

10 to 15+ years work experience in electrical engineering for Oil & Gas, Refinery, Petrochemical or Heavy industrial projects, in an EPC environment. Knowledge and experience of applying Canadian Electrical Code.
Degree/Diploma in Electrical Engineering from a recognized Institute.
2D/3D AutoCAD, Microstation
Responsibilities:
Responsible designer for a project to carry out FEED, EDS, detail engineering, including man-hour estimate, scheduling and progress reporting.
Duties include preparation of material requisition, cost-estimates, and detailed engineering deliverables such as:
Construction Work Packages.
Hazardous Area Classification drawings.
Single Line/Three line diagrams, control schematics, grounding and lighting drawings, cable/conduit/tray routing plans, electrical/instrument location drawings, cable schedules, panel schedules and electrical equipment data sheets.
Equipment sizing, cable sizing, voltage drop, motor starting and lighting calculations, load flow, fault calculations, relay coordination.
Design of high/medium/low voltage distribution systems.
Electric Heat tracing design.
Technical bid evaluation/recommendation and Vendor document review.
Interested candidates should submit their MS Word format resume to Taryn Gantar at tgantar@dg.ca for consideration.

Sr. Electrical Engineer in Canada

2011-09-08T23:20:00.002+08:00

Sr. Electrical Engineer
Work Description:
Headquartered in Singapore, Flextronics is a leading Electronics Manufacturing Services (EMS) provider focused on delivering complete design, engineering and manufacturing services to automotive, computing, consumer, industrial, infrastructure, medical and mobile OEMs. Flextronics helps customers design, build, ship, and service electronics products through a network of facilities in 30 countries on four continents. This global presence provides design and engineering solutions that are combined with core electronics manufacturing and logistics services, and vertically integrated with components technologies, to optimize customer operations by lowering costs and reducing time to market. For more information, please visit www.flextronics.com .

Responsibility:

Electrical/Hardware Engineer is responsible for design and development of electronics used in a Smartphone and computing devices. EE may lead a small group of junior engineers in the development of one of the electrical blocks of a smartphone. A Senior Engineer will write or guide junior engineers in the writing of technical specifications and test plans for semi-custom integrated circuits and electrical subsystem. This position will have the responsibility for electrical functionality of one of the major blocks on the Smartphone such as Display, Power Management, Memory, Apps processor, Audio, Display, EMC, and Signal integrity.

Major Duties:
The design and development activities include electrical design (processor, memory, display, audio, power control, I/O, and accessories), ASIC specification, component testing / optimization, system testing / integration, product certification and transfer to manufacturing.
Evaluating potential component suppliers, by assessing each vendor's devices and comparing them across several different criteria (electrical performance, component packaging, delivery timeframe, cost, etc.)
Generating supporting design documentation for product development (Electrical functional spec, ASIC specification, Test & Adjust specification, production specification, etc.).
Participate and support in detail design of schematic and PCB.
Test plan execution from the IC level, to the circuit block, and system levels to insure compliance with all applicable specifications and requirements.
Developing and maintaining test platforms for hardware verification and software development.
Conducting environmental tests, providing component qualification support, and providing support to manufacturing through mass production.
Working in a cross functional environment, for the timely development of components (display, speaker, buzzer, microphone, battery, accessories, etc.) and providing support for SW development and integration testing.

REQUIRED Basic Work Requirements:

BS/MS in Electrical Engineering, or relevant background experience.
8+ years industry experience, minimum 5 years in a design contributing role.
Knowledge and experience high speed circuit design for mobile device products and computing devices.
Experience with schematic and PCB design.
Knowledge and experience in the certification of radio / cellular products to regulatory and telecom carrier requirements.
Experience with supporting prototype builds and transferring design to manufacturing.
Experience in working with test labs and agencies for product testing and certification
Results oriented work ethic and the ability to work effectively and respectfully in a project team.
Good communications in oral and written English language

Additiona job requirements

Experience in one or more of the following areas:
Experience with Tier I embedded ARM SoCs and associated peripheral chipsets.
Experience with memory subsystem.
Experience with power Management and thermal management for mobile products
Experience with multimedia (Audio, Video, Display, Camera) for mobile products
Experience with connectivity such as HDMI and USB.
Experience with EMC certification and mitigation techniques.
Experience and knowledge of CAD tools for simulating high speed digital circuits (SI & EMC)
Mandarin language skills

Electrical Engineer in Canada

2011-09-08T23:17:00.002+08:00

Electrical Engineer in Canada
Work Description:
Design Group has partnered with a dynamic manufacturing company to assist them in their search for an Electrical Engineer.

Additional Requirements:

The successful candidate will be responsible for:

· Design, feasibility studies and electrical schematics and wiring diagrams
· Writing reports, proposals and engineering calculations
· Providing mentorship to the team and responding to inquiries from the field
· Interacting with clients and sourcing new work
· Conducting inspections

We are looking for candidates with a B. Sc. in Electrical Engineering, 3+ years of relevant experience and exposure to project management.

To apply for this position, please email your resume in dmacdonald@dg.ca .

Sr. Electrical Engineer in Canada

2011-09-08T23:10:00.000+08:00

Work Description

Develops, approves, and co-ordinates work schedules to ensure that objectives of cost, quality, and time are met
Requires effective working relationships with colleagues, officials, and associates for the purpose of discussing design problems, explaining design features and specifications, and other project control criteria
Establishes and maintains client contacts to seek or provide technical information related to the immediate project
Analyses problems, organizes investigations, and determines specific design criteria
Makes commitments on acceptance of projects, completion dates, resources and staff required to meet objectives
Is required to have knowledge of related disciplines/fields of engineering
Work is assigned in terms of objectives, relative priorities, and critical areas that impact on the work of other units
Assigns and outlines work, advises on technical problems, and reviews work for technical accuracy and adequacy

Work Requirements:

University degree in electrical engineering
At least ten (10) years of experience in electrical engineering
Registered as a Professional Engineer in Canada (or eligibility)
Ideally have experience in the study, technical knowledge and design expertise of electrical distribution systems and industrial controls for a broad range of industries
Previous consulting engineering experience is an asset
Excellent communication skills are required (client relations, team project communications, proposal & report development).

If you meet the above qualifications and are interested in the opportunity please submit your resume to: pstephen@dg.ca

DC ELECTRIC CIRCUITS - Day 5

2011-04-19T23:41:00.000+08:00

Question 1: EE Board October 1997

A load of 10 ohms was connected to a 12-volt battery. The current drawn was 1.18 amperes. What is the internal resistance of the battery?

A. 0.35 ohm

B. 0.20 ohm

C. 0.25 ohm

D. 0.30 ohm

Question 2:

The potential at the terminals of the battery falls from 9 V on open circuit to 6 volts when a resistor of 10 ohms is connected across its terminals. What is the internal resistance of the battery?

A. 5Ω

B. 4Ω

C. 3Ω

D. 2Ω

Question 3: EE Board April 1997

The electromotive force of a standard cell is measured with a potentiometer that gives a reading of 1. 3562 V. When a 1.0 megaohm resistor is connected across the standard cell terminals, the potentiometer reading drops to 1.3560 V. What is the internal resistance of the standard cell?

A. 174.5 ohms

B. 145.7 ohms

C. 147.5 ohms

D. 157.4 ohms

Question 4:

A battery is formed of five cells joined in series. When the external resistance is 4 ohms, the current is 1.5 A and when the external resistance is 9 ohms, the current falls to 0.75 A. Find the internal resistance of each cell.

A. 0.5 ohm

B. 1.0 ohm

C. 0.2 ohm

D. 0.3 ohm

Question 5: EE Board April 1988

A Barangay power station supplies 60 kW to a load over 2,500 ft, 100 mm², two-conductors copper feeder, the resistance of which is 0.078 ohm per 1000 ft. The bus bar voltage is maintained constant at 600 V. Determine the load current.

A. 105 A

B. 108 A

C. 110 A

D. 102 A

Question 6:

A 120 V DC motor draws current of 100 A and is located 1000 ft from the supply source. If the diameter of the copper transmission line is 0.45 inch, what must be the voltage of the supply?

A. 125.32 V

B. 130.24 V

C. 129.32 V

D. 127.05 V

Question 7: EE Board October 1986

A LRT car, 5 km distance from the Tayuman, takes 100 A over a 100 mm hard drawn copper trolley wire having a resistance of 0.270 ohm per km. The rail and ground return has a resistance of 0.06 ohm per km. If the station voltage is 750 V, what is the voltage of the car?

A. 585 V

B. 590 V

C. 585 V

D. 590 V

Question 8:

The hot resistance of an incandescent lamp is 10 ohms and the rated voltage is 50 V. Find the series resistance required to operate the lamp from an 80 V supply.

A. 8Ω

B. 4Ω

C. 6Ω

D. 10Ω

Question 9:

A resistive coil draws 2 A at 110 V after operating for a long time. If the temperature rise is 55 ⁰C above the ambient temperature of 20 ⁰C, calculate the external resistance which must be initially connected in series with the coil to limit the current to 2 A. The temperature coefficient of the material of the coil is 0.0043 per ⁰C at 20 ⁰C.

A. 10.12 ohms

B. 10.52 ohms

C. 11.45 ohms

D. 12.05 ohms

Question 10:

A carbon resistor dissipates 60 W of power from a 120 V source at 20 ⁰C. How much power will be dissipated in the resistor at 120 ⁰C if connected across the same source? Assume the temperature coefficient of carbon at 20^thC is -0.0005 per ⁰C.

A. 61.50 W

B. 65.21 W

C. 62.34 W

D. 63.16 W

DC ELECTRIC CIRCUITS - Day 4

2011-04-19T21:21:00.000+08:00

Question 1: EE Board April 1981, EE Board October 1984

Two (2) 115-V incandescent lamps A and B are connected in series across a 230-V source. If lamp A is rated 75 watts and lamp B is rated 50 watts, determine the current drawn by the series connection.

A. 0.52 A

B. 0.64 A

C. 0.48 A

D. 0.57 A

Question 2:

An arc lamp takes 10 A 50 volts. A resistance R is to be place in series so that the lamp may burn correctly from a 110 V supply. Find the power wasted in this resistor.

A. 800 watts

B. 600 watts

C. 700 watts

D. 900 watts

Question 3:

Conductor “x” of a certain material and a given cross section has a resistance of 0.1 ohm per meter and a temperature coefficient of 0.005 per ⁰C. Conductor “y” of another material and a given cross section has a resistance of 0.5 ohms per meter and a temperature coefficient of 0.001 per ⁰C. Is desired to make a coil having a resistance of 500 ohms and a temperature coefficient of 0.002 by using suitable lengths of the two wires connected in series. Calculate the required length of wire “x”

A. 1225 m

B. 1250 m

C. 1240 m

D. 1210 m

Question 4: EE Board April 1997

If a resistor rated at 5 watts and 6 volts are connected across a battery with an open circuit voltage of 6 volts. What is the internal resistance of the battery if the resulting current is 0.8 A?

A. 0.30 ohm

B. 0.26 ohm

C. 0.23 ohm

D. 0.03 ohm

Question 5:

A high voltage DC transmission line delivers 1000 MW at 500 kV to an aggregate load over a distance of 900 km. Determine the voltage at the sending end. Assume the loop resistance of the line to be 1mΩ per km.

A. 510.5 kV

B. 505.2 kV

C. 507.7 kV

D. 503.6 kV

Question 6: EE Board April 1989

It is required that a loading of 3 kW be maintained in a heating element at an initial temperature of 20 ⁰C, a voltage of 220 V is necessary for the purpose. After the element has settled down to steady state, it is found that a voltage of 240 volts is necessary to maintain the 3 kW loading. The element resistance temperature coefficient is 0.0006 per degree centigrade at 20 ⁰C. Calculate the final temperature of the heating element.

A. 345.43 ⁰C

B. 326.42 ⁰C

C. 336.84 ⁰C

D. 318.48 ⁰C

Question 7:

A 200-W, 110-V incandescent lamp has a filament having a temperature coefficient of resistance equal to 0.005 at ⁰C. If the normal operating temperature of the bulb is 2500 ⁰C, how much current will the bulb draw at the instant it is turned on. Assume a room temperature of 20 ⁰C.

A. 29.42 A

B. 18.37 A

C. 22.31 A

D. 28.21 A

Question 8:

The power drawn by a resistive coil made of copper wire is 220 W at 100 V and 20 ⁰C. Calculate the power consume by the coil at 115 V and 100 ⁰C. The temperature coefficient of resistance at 20 ⁰C is 0.00393.

A. 175 W

B. 211 W

C. 183 W

D. 225 W

Question 9:

An electric water heater has a rating of 1 kW, 230 V. The coil used as the heating element is 10 m long and has a resistivity of 1.724 x 10^-6 ohm-cm. Determine the required diameter of the wire in mils?

A. 2.43 mils

B. 2.52 mils

C. 3.21 mils

D. 1.35 mils

Question 10:

When two resistors A and B are connected in series, the total resistance is 36 ohms. When connected in parallel, the total resistance is 8 ohms. What is the ratio of the resistance Ra to resistance Rb . Assume Ra <Rb.

A. 0.5

B. 0.4

C. 0.8

D. 0.6

DC ELECTRIC CIRCUITS - Day 3

2011-04-19T21:14:00.000+08:00

Question 1: EE Board March 1998

Three resistors of 10, 15 and 20 ohms each are connected in parallel. What is the equivalent resistance?

A. 45 ohms

B. 17.2 ohms

C. 0.22 ohm

D. 4.62 ohms

Question 2:

The equivalent resistance of three resistors A, B and C connected in parallel is 1.714 ohms. If A is twice of B and C is half as much as B, find the equivalent resistance when the three of them are connected in series.

A. 17.5 ohms

B. 21.0 ohms

C. 24.5 ohms

D. 28.0 ohms

Question 3:

Three resistors of 10, 12 and 15 ohms are connected in parallel. Evaluate the value of current to the parallel system that will make the current in the 10 ohm resistor equal to 2 A.

A. 5 A

B. 6 A

C. 4 A

D. None of these

Question 4:

Three resistors of 10, 12 and “x” ohms, respectively are connected in parallel across a constant current source of 8 A. Determine “x” if this resistor draws

2.5 A.

A. 10Ω

B. 12Ω

C. 13Ω

D. 11Ω

Question 5:

Two resistors A and B made of different materials have temperature coefficients of resistance at 20 ⁰C of 0.004 and 0.006 respectively. When connected across a voltage source at 20 ⁰C, they draw current equally. What percentage of the total current at 100 ⁰C does resistor A carry?

A. 47.14%

B. 52.86%

C. 61.34%

D. 38.66%

Question 6:

Two resistor A and B made of different materials have temperature coefficients of resistance of 0.003 and 0.005, respectively. When connected in parallel across a voltage source at 15 ⁰C, it consumes equal power. What is the ratio of the power drawn by resistor B to that in resistor A when temperature rises to 60 ⁰ C? Assume supply voltage is constant.

A. 0.829

B. 0.926

C. 0.964

D. 0.882

Question 7: EE Board March 1998

Three resistor of 10, 15 and 20 ohms each are connected in parallel. What is the total conductance?

A. 0.217 mho

B. 3.41 mhos

C. 4.62 mhos

D. 0.52 mho

Question 8:

Two heating units x and y are connected across a 100 V supply. Unit y takes twice as much power as unit x. Total power supplied by the source is 2280 watts. Determine the total power drawn by the heating units if they are connected in series across the same source.

A. 615.32 W

B. 506.58 W

C. 582.45 W

D. 604.38 W

Question 9:

Three resistors R , R and R are connected in series-parallel with R1 in series with the parallel combination of R2 and R3. The whole combination is connected across a 120 V DC source. Resistors R1, R2 and R3 take 750 W, 250 W and 200 W, respectively Calculate the resistance R2.

A. 8.10Ω

B. 8.52Ω

C. 7.84Ω

D. 9.22Ω

Question 10:

Two lamps X and Y are connected in series. Lamp X is rated 50 W at 100 V while lamp Y is rated at 100 W at 100 V also. The two lamps are to be connected in series across a 200 V source. What resistance must be connected across lamp A so that each lamp will operate properly?

A. 150 ohms

B. 100 ohms

C. 200 ohms

D. 180 ohms

DC ELECTRIC CIRCUITS - Day 2

2011-04-19T21:09:00.000+08:00

Question 1: EE Board October 1997

A 5-ohm resistance is connected in parallel with a 10-ohm resistance. Another set, a 6-ohm and an 8-ohm resistances are also connected in parallel. The two sets are connected in series. What is the equivalent resistance?

A. 6.76 ohms

B. 9.25 ohms

C. 14.4 ohms

D. 21.2 ohms

Question 2: EE Board March 1998

Two resistances of 10 and 15 ohms each respectively are connected in parallel. The two are then connected in series with a 5-ohm resistance. What is the equivalent resistance?

A. 11 ohms

B. 12 ohms

C. 10 ohms

D. 9 ohms

Question 3:

From the circuit as shown, determine the resistance between terminals a &

___________

a 1 Ω | 2 Ω 3 Ω | 4 Ω b

–—^^^—–^^^—–^^^—–^^^——–

|_____________|

A. 1.000 Ω

B. 1.923 Ω

C. 2.083 Ω

D. 2.352 Ω

Question 4: EE Board October 1997

A 10-ohm and a 20-ohm resistance are connected in parallel. Another resistance of 5-ohm is connected in series with the two. If the supply voltage is 48 volts, what is the current through the 10-ohm resistance?

A. 3.21 A

B. 2.74 A

C. 4.02 A

D. 5.72 A

Question 5:

A 30-ohm resistor is connected in parallel with a variable resistance R. The parallel combination is then connected in series with a 6-ohm resistor and connected across a 120 V source. Find the minimum value of R if the power taken by R is equal to the power taken by the 6-ohm resistor.

A. 10.35 Ω

B. 12.24 Ω

C. 10.24 Ω

D. 11.46 Ω

Question 6: EE Board March 1998

Two resistances of 10 and 15 ohms, each respectively are connected in parallel. The two are then connected in series with a 5-ohm resistance. It is then connected across a 12-V battery, what are the current and power?

A. 1.2 A, 17.28 W

B. 0.96 A, 11.52 W

C. 1.09 A, 13.1 W

D. 1.5 A, 20.25 W

Question 7:

An 8-ohm resistor is connected in series with a parallel combination of two resistors, R and 24 ohms. Determine R if the power consumed by the parllel-connected resistors is equal to the power consumed by the 8-ohm resistor.

A. 10 ohms

B. 16 ohms

C. 12 ohms

D. 20 ohms

Question 8:

A multi-tap resistor R is connected across a 220-V supply. A voltmeter whose internal resistance is 15-k Ω is connected across the center tap and one end of the supply terminals. If the voltmeter registers 100 V, what is the value of resistor R.

A. 5.5 k Ω

B. 5.0 k Ω

C. 6.0 k Ω

D. 6.5 k Ω

Question 9:

A potential divider of resistance of 50 ohms is connected across a 100 V DC source. A load resistance of 10 ohms is connected across a tap in the potential divider and the negative terminal of the source. If a current of 4 A flows towards the load, what is the current supplied by the source?

A. 5.32 A

B. 5.05 A

C. 5.21 A

D. 5.48 A

Question 10:

Two resistors A and B are connected in series across a 220 V DC source. When a voltmeter with an internal resistance of 10 k Ω ohms, is connected across resistor A, the instrument reads 100 V and when connected across resistor B, it reads 80 volts. Find the resistance of resistor A.

A. 4 k Ω

B. 3 k Ω

C. 5 k Ω

D. 6 k Ω

DC ELECTRIC CIRCUITS - Day 1

2011-04-19T21:05:00.000+08:00

Question 1: EE Board April 1992

An electric kettle was marked 500 W, 230 V found to take 15 minutes to bring 1 kilogram of water at 15 ⁰C to boiling point. Determine the heat efficiency of the kettle.

A. 79.1%

B. 75.3%

C. 72.4%

D. 74.8%

Question 2: EE Board October 1997

A process equipment contains 100 gallons of water at 25 ⁰C. It is required to bring it to boiling in 10 minutes. The heat loss is estimated to be 5%. What is the kW rating of the heater?

A. 125 kW

B. 252 kW

C. 50.5 kW

D. 207 kW

Question 3: EE Board October 1989

A total of 0.8 kg of water at 20 ⁰C is placed in a 1-kW electric kettle. How long a time in minute is needed to raise the temperature of the water to 100 ⁰C?

A. 4.46 min.

B. 5.32 min

C. 6.34 min

D. 4.56 min

Question 4: EE Board October 1998

How many calories does an electric heater of 100 watts generate per second?

A. 10

B. 23.88

C. 1000

D. 42.25

Question 5: EE Board October 1997

The electric energy required to raise the temperature of water in a pool is 1000 kWh. If the heat losses are 25%, the heating energy required will be ___.

A. 1111 kWh

B. 1266 kWh

C. 1750 kWh

D. 1333 kWh

Question 6: EE Board April 1992

An electric heater carries 12 A at 110 V, is submerged in 22.5 lbs of water for 30 minutes. What will be the final temperature of the water if its initial temperature is 35 ⁰F?

A. 135.43 ⁰F

B. 125.42 ⁰F

C. 133.56 ⁰F

D. 128.33 ⁰F

Question 7: EE Board October 1990

In an electric heater the inlet temperature is 15 ⁰C. Water is flowing at the rate of 300 grams per minute. The voltmeter measuring voltage across the heating element reads 120 volts and an ammeter measuring current taken reads 10 amperes. When steady state is finally reached, what is the final reading of the outlet thermometer?

A. 57.6 ⁰C

B. 68.4 ⁰C

C. 72.6 ⁰C

D. 42.6 ⁰C

Question 8: EE Board October 1991

Four cubic meters of water is to be heated by means of four 1.5 kW, 230-V immersion heating elements. Assuming the efficiency of the heater as 90%, determine the time required boiling the water if the initial temperature is 20 ⁰C and if all four elements are connected in parallel.

A. 71 hrs

B. 63 hrs

C. 69 hrs

D. 66 hrs

Question 9: EE Board October 1991

A. 275.6 hrs

B. 295.3 hrs

C. 252.2 hrs

D. 264.4 hrs

Question 10: EE Board April 1997

A circuit consisting of three resistors rated: 10 ohms, 15 ohms and 20 ohms are connected in delta. What would be the resistances of the equivalent wye connected load?

A. 0.30, 0.23 and 0.15 ohm

B. 3.0, 4.0 and 5.0 ohms

C. 3.33, 4.44 and 6.66 ohms

D. 5.77, 8.66 and 11.55 ohms

Question 11: EE Board October 1994

The equivalent wye element of 3 equal resistors each equal to R and connected in delta is

A. R

B. 3/2R

C. R/3

D. 3R

Question 12:

Three resistors of 6-ohm resistance are connected in delta. Inside the delta another three 6-ohm resistors are connected in wye. Find its resistance between any two corners.

A. 2 ohms

B. 3 ohms

C. 4 ohms

D. 1 ohm

BASIC PRINCIPLES - Day 3

2011-04-19T13:00:00.000+08:00

Question 1:

A positively charged dielectric has a charge of 2 coulombs. If 12.5 x 10¹⁸ free electrons are added to it, what will be the net charge on the said dielectric?

A. 4 C

B. -2 C

C. 8 C

D. Zero

Question 2:

A battery can deliver 10 joules of energy to move 5 coulombs of charge. What is the potential difference between the terminals of the battery?

A. 2 V

B. 50 V

C. 0.5 V

D. 5 V

Question 3:

A cloud of 2.5 x 10¹⁹ electrons move past a given point every 2 seconds. How much is the intensity of the electron flow?

A. 1 A

B. 2 A

C. 2.5 A

D. 1.5 A

Question 4:

The current in an electric lamp is 5 amperes. What quantity of electricity flows towards the filament in 6 minutes?

A. 30 C

B. 3600 C

C. 72 C

D. 1800 C

Question 5:

A constant current of 4 A charges a capacitor. How long will it take to accumulate a total charge of 8 coulombs on the plates?

A. 2 s

B. 32 s

C. ½ s

D. 12 s

Question 6: EE Board March 1998

The substation bus bar is made up of 2-iches round copper bars 20 ft. long. What is the resistance of each bar if resistivity is 1.724 x 10^-6 ohm-cm.

A. 7.21 x 10^-5 ohm

B. 13.8 x 10^-6 ohm

C. 5.185 x 10^-5 ohm

D. 2.96 x 10^-5 ohm

Question 7: EE Board October 1997

Determine the resistance of a bus bar made of copper if the length is 10 meters long and the cross-section is a 4 x 4 cm². Use 1.7241 micro ohm-cm as the resistivity.

A. 2.121 x 10^-4 ohm

B. 4.312 x 10^-4 ohm

C. 3.431 x 10^-5 ohm

D. 1.078 x 10^-4 ohm

Question 8:

Nichrome ribbon resistor elements each has a resistance of 1 ohm. The element is made from sheet of nichrome alloy, 0.025 cm thick. If the width of the ribbon is 0.3 cm, what length is required per element? Assume specific resistance of nichrme alloy to be 109 µΩ-cm.

A. 68.8 cm

B. 62.1 cm

C. 70.7 cm

D. 67.4 cm

Question 9: EE Board October 1991

One turn of a copper bar is produced by cutting a copper washer along a radius and spreading the ends. The washer is cut from soft-drawn copper having a resistivity at 20⁰C of 1.732 x 10^-6 ohm-cm. The washer is 0.125 inch thick and has inside diameter and outside diameter of 1 inch and 9 inches respectively. Calculate the exact resistance between the two ends of the turn to direct current, taking into account the non-uniform current distribution. Assume the contact along the ends of the turn to be perfect over the entire cross-section.

A. 12.74 x 10^-6 ohm

B. 15.53 x 10^-6 ohm

C. 17.22 x 10^-6 ohm

D. 14.83 x 10^-6 ohm

Question 10: EE Board October 1990

Determine the resistance of a conductor 0.10 m long, with a uniform diameter of 1.0 cm and having a resistivity which varies as a function of length L measured from one end of the conductor according to the formula: ρ = 0.003 + 10^-4 L² ohm-cm.

A. 0.0852 ohm

B. 0.0915 ohm

C. 0.0806 ohm

D. 0.0902 ohm

BASIC PRINCIPLES - Day 2

2011-04-19T12:54:00.001+08:00

Question 1: EE Board April 1992

A coil has 6,000 turns of wire and a resistance of 380 ohms. The coil is rewound with the same quantity (weight) of wire, but has 13,400 turns. How many ohms will the new coil have?

A. 1895 ohms

B. 1825 ohms

C. 1792 ohms

D. 1905 ohms

Question 2: EE Board April 1992

A copper wire of unknown length has a resistance of 0.80 ohm. By successive passes through drawing dies, the length of the wire is increased to 2 ½ times its original value. Assuming that resistivity remains unchanged during the drawing process, determine the new value of its resistance.

A. 4 Ω

B. 3 Ω

C. 5 Ω

D. 6 Ω

Question 3: EE Board October 1998

A one-meter rod of 2-cm diameter is drawn until its resistance is 100 times the initial resistance. Its length afterward is?

A. 10 m

B. 100 m

C. 12.5 M

D. 5 m

Question 4: EE Board April 1993

A kilometer of wire having a diameter of 11.7 mm and a resistance of 0.031 ohm is drawn down so that its diameter is 5.0 mm. What does its resistance become?

A. 0.85 ohm

B. 0.78 ohm

C. 0.93 ohm

D. 0.81 ohm

Question 5:

A conductor whose diameter is 0.175 inch has a resistance of 0.5 ohm. The wire is drawn through a series of dies until its diameter is reduced to 0.08 inch. Assuming the specific resistance of the material remains constant, what is the resistance of lengthened conductor?

A. 11.45 Ω

B. 10.22 Ω

C. 12.75 Ω

D. 10.82 Ω

Question 6: EE Board April 1995

A certain wire has a resistance R. The resistance of another wire identical with the first except for having twice its diameter is

A. 4R

B. ½R

C. 2R

D. ¼ R

Question 7:

A given wire has a resistance of 17.5 ohms. If its length is 560 m, how much length must be cut-off from the wire in order to reduce its resistance to 12.5 ohms.

A. 160 m

B. 170 m

C. 145 m

D. 155 m

Question 8: EE Board October 1996

What is the size in square millimeter (mm²) is the cable of 250 MCM size?

A. 118.656 mm²

B. 126.675 mm²

C. 112.565 mm²

D. 132.348 mm²

Question 9:

A 500 MCM ACSR cable has 37 strands. Determine the diameter in mils of each strand.

A. 116.25

B. 120.24

C. 118.34

D. 110.35

Question 10:

A copper transmission line is to be replaced by one of aluminum having the same total resistance. If the cross sectional area of the copper wire is 500 MCM, what would be the cross sectional area of the new aluminum wire?

A. 800 MCM

B. 820 MCM

C. 850 MCM

D. 900 MCM

BASIC PRINCIPLES - Day 1

2011-04-16T01:28:00.000+08:00

Question 1: EE Board October 1998
   The resistance of 120 meters of wire is 12 ohms. What is its conductance?

A. 12 mhos
B. 6 mhos
C. 0.083 mho
D. 0.0521 mho

Question 2: EE Board October 1992
   The insulation resistance of a kilometer of the cable having a diameter of 2 cm and an insulation thickness of 2 cm is 600 ohms. If the thickness of the insulation is increased to 3 cm, find the insulation resistance of the cable.

A. 828 ohms
B. 757 ohms
C. 850 ohms
D. 725 ohms

Question 3:
   The diameter of a given bare conductor is 0.50 inch. A thermoplastic insulation with thickness of 0.1 inch is wrapped around to insulate the conductor. Determine the insulation resistance of this conductor per meter. Assume specific resistance of thermoplastic insulation to be 2 x 10^14 ohm-cm.

A. 109 x 10^9 Ω
B. 110 x 10^9 Ω
C. 105 x 10^9 Ω
D. 107 x 10^9 Ω

Question 4:
   A cylindrical rubber insulated cable has a diameter of 0.18 inch and an insulation of thickness of 0.25 inch. If the specific resistance of rubber is 10^14 ohm-cm, determine the insulation resistance of 1000-ft lenght of the cable.

A. 694 MΩ
B. 678 MΩ
C. 682 MΩ
D. 624 MΩ

Question 5: EE Board October 1991
   Two heating element which is 500 ohms and 250 ohms are connected in series with temperature coefficients of 0.001 and 0.003 ohms per ⁰C, respectively at 20 ⁰C. Calculate the effective temperature coefficient of the combination.

A. 0.00167
B. 0.00712
C. 0.00626
D. 0.00215

Question 6:
   Two wires A & B made from two different materials have temperature coefficient of resistance equal to 0.0025 and 0.0005 ohm per ⁰C, respectively. It is desired to make a coil of wire having a resistance of 1200 ohms with a temperature coefficient of 0.001, using the suitable length of the two given wires connected in series. Determine the required length of wire.

A. 5.0 m
B. 6.0 m
C. 6.2 m
D. 5.5 m

Question 7: EE Board March 1998
   The resistance of a wire is 126.48 ohms at 100 ⁰C and 100 ohms at 30 ⁰C. Determine the temperature coefficient of copper at 0 ⁰C.

A. 0.0356
B. 0.0256
C. 0.00615
D. 0.00427

Question 8:
   The field winding of a series motor has a resistance of 120 ohms at 15 ⁰C. After running for two hours, the resistance increases to 140 ohms. If the temperature coefficient of the windings at 0⁰C is 0.004, find the new temperature of the windings.

A. 53.7 ⁰C
B. 58.4 ⁰C
C. 59.2 ⁰C
D. 60.4 ⁰C

Question 9:
   The shunt field winding of a shunt generator has a resistance of 80 ohms at 20⁰C. After several hours of continuous operation, the winding temperature rises to 50⁰C. How much is the winding resistance under this condition. Assume the resistance temperature coefficient of copper to be 0.004 ohm per degree at 0⁰C.

A. 92.81 ohms
B. 85.22 ohms
C. 90.12 ohms
D. 88.89 ohms

Question 10:
   The resistance of a copper wire at 30⁰C is 50 ohms. If the temperature coefficient of copper at 0⁰C is 0.00427, what is the resistance at 100⁰C?

A. 58.15 ohms
B. 63.24 ohms
C. 54.25 ohms
D. 72.26 ohms