56. When the output of a tristate shift register is disabled, the output level is placed in a:
(a) float state
(b) LOW state
(c) high-impedance state
(d) float or high-impedance state
57. What are the three output conditions of a three-state buffer?
(a) HIGH, LOW, float
(b) 1, 0, float
(c) both of the above
(d) neither of the above
58. What is the difference between a ring shift counter and a Johnson shift counter?
(a) There is no difference.
(b) A ring is faster.
(c) The feedback is reversed.
(d) The Johnson is faster.
59. What is the preset condition for a ring shift counter?
(a) all FFs set to 1
(b) all FFs cleared to 0
(c) a single 0, the rest 1
(d) a single 1, the rest 0
60. To operate correctly, starting a ring shift counter requires:
(a) clearing all the flip-flops
(b) presetting one flip-flop and clearing all others
(c) clearing one flip-flop and presetting all others
(d) presetting all the flip-flops
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