141. A one= shot is a type of
A. monostable multivibrator
B. astable multivibrator
C. bistable multivibrator
D. timer
142. An astable multivibrator
A. requires a periodic trigger input
B. has one stable states
C. is an oscillator
D. produces a non-periodic pulse output
143. A 1 msec pulse can be converted to a 10 msec pulse by using :
A. an astable multivibrator
B. a monostable multivibrator
C. a bistable multivibrator
D. a J-K flip-flop
144. A retriggerable one shot is one which
A. can be triggered only once
B. has two quassi-stable states
C. cannot be triggered until full pulse has been outputted
D. is capable of being triggered while the output is being generated
145. The output of the circuit shown in Fig. 7.7 will be
A. delayed pulses
B. squarewaves
C. trianglular waves
D. trapezoidal waves
146. The input waveform Vi and the output waveform Vo of a Schmitt NAND are shown in Fig. 7.8. The duty cycle of the output waveform is
A.100%
B.85.50%
C.72.20%
D.25%
147. Which of the following circuit is used for production of delays?
A. astable multivibrator
B. bistable multivibrator
C. monostable multivibrator
D. sclunitt-trigger
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