Shift Registers Questions and Answers

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Q1
On the fifth clock pulse, a 4-bit Johnson sequence is Q0 = 0, Q1 = 1, Q2 = 1, and Q3 = 1. On the sixth clock pulse, the sequence is ________.
  • A Q0 = 1, Q1 = 0, Q2 = 0, Q3 = 0
  • B Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 0
  • C Q0 = 0, Q1 = 0, Q2 = 1, Q3 = 1
  • D Q0 = 0, Q1 = 0, Q2 = 0, Q3 = 1
Answer: Option C
Q2
The bit sequence 0010 is serially entered (right-most bit first) into a 4-bit parallel out shift register that is initially clear. What are the Q outputs after two clock pulses?
  • A 0000
  • B 0010
  • C 1000
  • D 1111
Answer: Option C
Q3
What is a shift register that will accept a parallel input, or a bidirectional serial load and internal shift features, called?
  • A tristate
  • B end around
  • C universal
  • D conversion
Answer: Option C
Q4
On the third clock pulse, a 4-bit Johnson sequence is Q0 = 1, Q1 = 1, Q2 = 1, and Q3 = 0. On the fourth clock pulse, the sequence is ________.
  • A Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 1
  • B Q0 = 1, Q1 = 1, Q2 = 0, Q3 = 0
  • C Q0 = 1, Q1 = 0, Q2 = 0, Q3 = 0
  • D Q0 = 0, Q1 = 0, Q2 = 0, Q3 = 0
Answer: Option A
Q5
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
Q6
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
Q7
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
Q8
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
Q9
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
Q10
In a 6-bit Johnson counter sequence there are a total of how many states, or bit patterns?
  • A 2
  • B 6
  • C 12
  • D 24
Answer: Option C

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