Digital questions -1

1.	The ________ circuit overcomes the problem of switching caused by jitter on the inputs.
	A. astable multivibrator B. monostable multivibrator C. bistable multivibrator D. Schmitt trigger

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2.	Why would a delay gate be needed for a digital circuit?
	A. A delay gate is never needed. B. to provide for setup times C. to provide for hold times D. to provide for setup times and hold times

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3.	An optocoupler is an integrated circuit with an LED and a zener diode encased in the same package.
	A. True B. False

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4.	A Schmitt trigger has VT+ = 2.0 V and VT– = 1.2 V. What is the hysteresis voltage of the Schmitt trigger?
	A. 0.4 volt B. 0.6 volt C. 0.8 volt D. 1.2 volts

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5.	Which of the following circuit parameters would be most likely to limit the maximum operating frequency of a flip-flop?
	A. setup and hold time B. clock pulse HIGH and LOW time C. propagation delay time D. clock transition time