56. To completely load and then unload an 8-bit register requires how many clock pulses?
(a) 2
(b) 4
(c) 8
(d) 16
57. A correct output is achieved from a master-slave J-K flip-flop only if its inputs are stable while the:
(a) clock is LOW
(b) slave is transferring
(c) flip-flop is reset
(d) clock is HIGH
58. The toggle condition in a master-slave J-K flip-flop means that Q and will switch to their ________ state(s) at the ________.
(a) opposite, active clock edge
(b) inverted, positive clock edge
(c) quiescent, negative clock edge
(d) reset, synchronous clock edge
59. The phenomenon of interpreting unwanted signals on J and K while Cp (clock pulse) is HIGH is called ________.
(a) parity error checking
(b) ones catching
(c) digital discrimination
(d) digital filtering
60. On a J-K flip-flop, when is the flip-flop in a hold condition?
(a) J = 0, K = 0
(b) J = 1, K = 0
(c) J = 0, K = 1
(d) J = 1, K = 1
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555555555571. Which of the following describes the operation of a positive edge-triggered D flip-flop? (a) If both inputs are HIGH, the output will toggle. (b) The output will follow the input on the leading edge of the clock. (c) When both inputs are LOW, an invalid state exists. (d) The input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock.
5555555555 40. Which of the following describes the operation of a positive edge-triggered D-type flip-flop? (a) If both inputs are HIGH, the output will toggle. (b) The output will follow the input on the leading edge of the clock. (c) When both inputs are LOW, an invalid state exists. (d) The input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock.
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 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 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 104. Most people would prefer to use ________ over HDL. (a) graphic descriptions (b) functions (c) VHDL (d) AHDL 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 = 0 106. The key to edge-triggered sequential circuits in VHDL is the ________. (a) ARCHITECTURE (b) PROCESS (c) FUNCTION (d) VARIABLE 107. The J-K flip-flop is a standard building block of clocked (sequential) logic circuits known as a ________.…
555555555534. Which of the following is correct for a gated D-type flip-flop? (a) The Q output is either SET or RESET as soon as the D input goes HIGH or LOW. (b) The output complement follows the input when enabled. (c) Only one of the inputs can be HIGH at a time. (d) The output toggles if one of the inputs is held HIGH.