Analog Electronics
When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current

  remains almost the same.
 is zero.
 increases by a factor of 6.
 decreases by a factor of 6.

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Analog Electronics
In all base driver amplifiers

None of these
ac collector voltage is 180° out of phase with ac base voltage
ac collector voltage is in phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage

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Analog Electronics
A working diode must have

 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased
 Low resistance when forward or reverse biased

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