Flip Flops – Exercise – 2

66. What is the hold condition of a flip-flop?

(a) both S and R inputs activated
(b) no active S or R input
(c) only S is active
(d) only R is active

Answer
Answer : (b)
Explanation
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67. Why are the S and R inputs of a gated flip-flop said to be synchronous?

(a) They must occur with the gate.
(b) Th
(c)
(d)

Answer
Answer : (a)
Explanation
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68. When is a flip-flop said to be transparent?

(a) when the Q output is opposite the input
(b) when the Q output follows the input
(c)
(d)

Answer
Answer : (b)
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69. Which of the following is correct for a gated D flip-flop?

(a) The output toggles if one of the inputs is held HIGH.
(b) Only one of the inputs can be HIGH at a time.
(c) The output complement follows the input when enabled.
(d) Q output follows the input D when the enable is HIGH.

Answer
Answer : (d)
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70. Edge-triggered flip-flops must have:

(a) very fast response times
(b) at least two inputs to handle rising and falling edges
(c) positive edge-detection circuits
(d) negative edge-detection circuits

Answer
Answer : (c)
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