141. A one= shot is a type of
A. monostable multivibrator
B. astable multivibrator
C. bistable multivibrator
D. timer

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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

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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

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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

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145. The output of the circuit shown in Fig. 7.7 will be
A. delayed pulses
B. squarewaves
C. trianglular waves
D. trapezoidal waves

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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%

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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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