Flip-Flops and Timers Questions and Answers

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Q1
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.
Answer: Option A
Q2
When both inputs of a J-K flip-flop cycle, the output will:
  • A be invalid
  • B not change
  • C change
  • D toggle
Answer: Option B
Q3
Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?
  • A asynchronous operation
  • B low input voltages
  • C gate impedance
  • D cross coupling
Answer: Option D
Q4
A basic S-R flip-flop can be constructed by cross-coupling which basic logic gates?
  • A AND or OR gates
  • B XOR or XNOR gates
  • C NOR or NAND gates
  • D AND or NOR gates
Answer: Option C
Q5
One example of the use of an S-R flip-flop is as a(n):
  • A transition pulse generator
  • B astable oscillator
  • C racer
  • D switch debouncer
Answer: Option D
Q6
If both inputs of an S-R NAND latch are LOW, what will happen to the output?
  • A The output would become unpredictable.
  • B The output will toggle.
  • C The output will reset.
  • D No change will occur in the output.
Answer: Option A
Q7
An astable multivibrator is a circuit that:
  • A has two stable states
  • B is free-running
  • C produces a continuous output signal
  • D is free-running and produces a continuous output signal
Answer: Option C
Q8
What is another name for a one-shot?
  • A monostable
  • B bistable
  • C astable
  • D tristable
Answer: Option A
Q9
The truth table for an S-R flip-flop has how many VALID entries?
  • A 3
  • B 1
  • C 4
  • D 2
Answer: Option A
Q10
What is the significance of the J and K terminals on the J-K flip-flop?
  • A There is no known significance in their designations.
  • B The J represents "jump," which is how the Q output reacts whenever the clock goes HIGH and the J input is also HIGH.
  • C The letters represent the initials of Johnson and King, the co-inventors of the J-K flip-flop.
  • D All of the other letters of the alphabet are already in use.
Answer: Option A

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