Digital Electronics MCQs
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In a JK master slave flip flop
- A. master is clocked when clock is low
- B. slave is clocked when clock is high
- C. master is clocked when clock is high and slave is clocked when clock is low
- D. master is clocked when clock is low and slave is clocked when clock is high
- Correct Answer: Option C
Which of the following is susceptible to race condition?
- A. R-S latch
- B. D latch
- C. Both R - S and D latches
- D. None of the above
- Correct Answer: Option A
In a positive edge triggered JK flip flop
- A. High J and High K produce inactive state
- B. Low J and High K produce inactive state
- C. Low J and Low K produce inactive state
- D. High J and Low K produce inactive state
- Correct Answer: Option C
In a positive edge triggered D flip flop
- A. D input is called direct set
- B. Preset is called direct reset
- C. Present and clear are called direct set and reset respectively
- D. D input overrides other inputs
- Correct Answer: Option C
A 3 input NAND gate is to be used as inverter. Which of the following will give better results?
- A. The two unused inputs are left open
- B. The two unused inputs are connected to 0
- C. The two unused inputs are connected to 1
- D. None of the above
- Correct Answer: Option C
Assertion (A): A multiplexer can be used for data routing. Reason (R): A multiplexer has one input and many outputs.
- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R are correct but R is not correct explanation of A
- C. A is true, R is false
- D. A is false, R is true
- Correct Answer: Option C
If memory chip size is 256 x 1 bits, the number of chips required to make 1 k byte memory is
- A. 8
- B. 12
- C. 24
- D. 32
- Correct Answer: Option D
DeMorgan’s first theorem shows the equivalence of
- A. OR gate and Exclusive OR gate
- B. NOR gate and Bubbled AND gate
- C. NOR gate and NAND gate
- D. NAND gate and NOT gate
- Correct Answer: Option B
Using the same flip flops
- A. a synchronous flip flop can operate at higher frequency than ripple counter
- B. a ripple counter can operate at higher frequency than synchronous counter
- C. both ripple and synchronous counter can operate at the same frequency
- D. can not determine
- Correct Answer: Option A
A current tracer responds to
- A. steady current only
- B. pulsating current only
- C. both pulsating and steady current
- D. none of the above
- Correct Answer: Option B