# Flip Flops – Exercise – 3

101. A 555 operating as a monostable multivibrator has a C1 = 100 F. Determine R1 for a pulse width of 500 ms.

(a) 45
(b) 455
(c) 4.5 k
(d) 455 k

Explanation
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102. Assume a J-K flip-flop has 1s on the J and K inputs. The next clock pulse will cause the output to ________.

(a) set
(b) reset
(c) latch
(d) toggle

Explanation
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103. The postponed symbol () on the output of a flip-flop identifies it as being ________.

(a) a D flip-flop
(b) a J-K flip-flop
(c) pulse triggered
(d) trailing edge-triggered

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104. Most people would prefer to use ________ over HDL.

(a) graphic descriptions
(b) functions
(c) VHDL
(d) AHDL

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105. When the output of the NOR gate S-R flip-flop is in the HOLD state (no change), the inputs are ________.

(a) S = 1, R = 1
(b) S = 1, R = 0
(c) S = 0, R = 1
(d) S = 0, R = 0

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