40) Trigger pulses are essential for the operation of a bistable multivibrator because

there are no RC timing circuits

the circuit cannot switch between its two states automatically

transistor operation is controlled by the triggering pulses

all of these

Answer is:

all of these

Explanation:

Trigger pulses are essential for the operation of a bistable multivibrator because
* there are no RC timing circuits
* the circuit cannot switch between its two states automatically
* transistor operation is controlled by the triggering pulses

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41) In a multivibrator

feedback between two stages is 100%

feedback employed is positive

when one transistor is on, the other is off

all of the above

Answer is:

all of the above

42) An astable multivibrator produces

sine wave

triangular wave

saw-tooth wave

square wave

Answer is:

square wave

43) For generating a 1 kHz signal, the most suitable circuit is

Hartley oscillator

Colpitts oscillator

un tuned collector oscillator

Wein bridge oscillator

Answer is:

Wein bridge oscillator

44) Which one of the following oscillators is used for generation of high frequencies ?

R.C. phase shift

Wein bridge

L.C. oscillator

Blocking oscillator

Answer is:

L.C. oscillator

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