Multivibrators and 555 Timer Questions and Answers

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Q41
A bidirectional 4-bit shift register is storing the nibble 1101. Its input is HIGH. The nibble 1011 is waiting to be entered on the serial data-input line. After three clock pulses, the shift register is storing ________.
  • A 1101
  • B 0111
  • C 0001
  • D 1110
Answer: Option B
Q42
How can parallel data be taken out of a shift register simultaneously?
  • A Use the Q output of the first FF.
  • B Use the Q output of the last FF.
  • C Tie all of the Q outputs together.
  • D Use the Q output of each FF.
Answer: Option D
Q43
What is meant by parallel load of a shift register?
  • A All FFs are preset with data.
  • B Each FF is loaded with data, one at a time.
Answer: Option A
Q44
What does the output enable do on the 74395A chip?
  • A It determines when data can be loaded.
  • B It forces all outputs to go HIGH.
  • C It forces all outputs to go LOW.
  • D It activates the three-state buffer.
Answer: Option D
Q45
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
Answer: Option B
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