tag:blogger.com,1999:blog-15410386339371389712024-09-13T06:57:51.629-07:00satpansatpanhttp://www.blogger.com/profile/02844676451849547823noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-1541038633937138971.post-31339645456696298782010-11-07T01:19:00.000-07:002012-10-08T19:36:32.624-07:00Electronics puzzles<div dir="ltr" style="text-align: left;" trbidi="on">
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Q.1 The charging and discharging of a RC combination by a battery and switch is seen on a CRO. The waveform will be<br />
<br />
(a) a sawtooth<br />
(b) square pulses<br />
(c) sawtooth of amplitudeVc<br />
(d) square pulses of amplitude Vr+Vc<br />
<br />
<br />
<br />
ans. (d)<br />
<br />
<br />
<br />
<br />
Q.2 Hystersis losses<br />
<br />
(a) are caused by high frequency a.c current<br />
(b) generally increase with direct current in a coil<br />
(c) can't be produced in an iron core because it is a conductor<br />
(d) none of these<br />
<br />
<br />
<br />
ans (a)<br />
<br />
<br />
<br />
<br />
Q.3 intrinsic impedance of free space is given as<br />
<br />
(a) 75 ohm<br />
(b) 73 ohm<br />
(c) 377 ohm<br />
(d) 300 ohm<br />
<br />
<br />
<br />
ans (c)</div>
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