1) A \"D\" flip-flop with a PGT clock is in the CLEAR state. Which of the follow
ID: 2990625 • Letter: 1
Question
1) A "D" flip-flop with a PGT clock is in the CLEAR state. Which of the following input actions will cause it to change states?
A) CLK = PGT, D = 0 B) CLK = NGT, D = 1 C) CLK = PGT, D = 1 D) CLK = NGT, D - 0 E) Both A and C
2) What type of multivibrator has no stable state?
A) Monostable B) Bistable C) Astable D) Both A and C
3) A 1.5 MHZ clock signal is applied to an eight flip-flop binary counter. Which of the following indicates the proper MOD number, maximum number of counts, maximum count, and output frequency of the circuit?
A) MOD 128, 128 counts, 127 maximum count, and 23,437.5 Hz
B) MOD 256, 256 counts, 255 maximum count, and 11,718.75 Hz
C) MOD 512, 512 counts, 511 maximum count, and 2,929.69 Hz
D) MOD 256, 256 counts, 255 maximum count, and 5,859.38 Hz
4) Which of the following logic devices has only one stable state?
A) S-C flip-flop B) Monostable multivibrator C) J-K flip-flop D) Astable multivibrator
5) What is the output frequency of a three-stage binary counter with an input clock frequency of 80 kHz?
A) 15 kHz B) 20 kHz C) 5 kHz D) 10 kHz
6) What factors determine the duration of the quasi-stable output pulse from a one-shot multivibrator?
A) An external resistor and capacitor. B) An external Schmitt-trigger circuit. C) The time between input trigger pulses. D) The duration of the input trigger pulse.
7) What is the output state of a MOD-64 counter after 92 input pulses if the starting state is 000000?
A) 011110 2 B) 100100 2 C) 011100 2 D) 010110 2
8) Select the statement that best describes the operation of retriggerable and non-retriggerable one-shot multivibrators.
A) A non-retriggerable one-shot may be retriggered in either its quasi-stable or stable state.
B) A retriggerable one-shot must return to its stable state before it can be retriggered.
C) A retriggerable one-shot may be retriggered while in its quasi-stable state.
D) A non-retriggerable one-shot may be retriggered only while in its quasi-stable state.
9) What type of multivibrator produces a continuous pulse train?
A) Astable B) Monostable C) Bistable D) all of the above
Explanation / Answer
answer1)
C) CLK = PGT, D = 1
Answer 2)
C) Astable
answer 3)
D) MOD 256, 256 counts, 255 maximum count, and 5,859.38 Hz
answer 4 )
B) Monostable multivibrator
answer 5)
D) 10 kHz
answer 6)
A) An external resistor and capacitor.
answer 7)
C) 011100 2
answer 8)
B) A retriggerable one-shot must return to its stable state before it can be retriggered.
answer 9)
A) Astable
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