Flip Flops – Exercise – 2

76. Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?

(a) cross coupling
(b) gate impedance
(c) low input voltages
(d) asynchronous operation

Answer
Answer : (a)
Explanation
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77. One example of the use of an S-R flip-flop is as a(n):

(a) racer
(b) astable oscillator
(c) binary storage register
(d) transition pulse generator

Answer
Answer : (c)
Explanation
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78. Does the cross-coupled NOR flip-flop have active-HIGH or active-LOW set and reset inputs?

(a) active-HIGH
(b)
(c)
(d)

Answer
Answer : (a)
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79. How can the cross-coupled NAND flip-flop be made to have active-HIGH S-R inputs?

(a) It can’t be done.
(b) Invert the Q outputs.
(c)
(d)

Answer
Answer : (c)
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80. Assume an latch, made from cross-coupled NAND gates, has a 0 on both inputs. The outputs will be ________.

(a)
(b)
(c)
(d)

Answer
Answer : (d)
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