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MCQs

Total Questions : 60 | Page 1 of 6 pages
Question 1.  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 ________.
  1.    Q0 = 1, Q1 = 0, Q2 = 0, Q3 = 0
  2.    Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 0
  3.    Q0 = 0, Q1 = 0, Q2 = 1, Q3 = 1
  4.    Q0 = 0, Q1 = 0, Q2 = 0, Q3 = 1
 Discuss Question
Answer: Option C. -> Q0 = 0, Q1 = 0, Q2 = 1, Q3 = 1
Question 2.  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?
  1.    0000
  2.    0010
  3.    1000
  4.    1111
 Discuss Question
Answer: Option C. -> 1000
Question 3.  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 ________.
  1.    Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 1
  2.    Q0 = 1, Q1 = 1, Q2 = 0, Q3 = 0
  3.    Q0 = 1, Q1 = 0, Q2 = 0, Q3 = 0
  4.    Q0 = 0, Q1 = 0, Q2 = 0, Q3 = 0
 Discuss Question
Answer: Option A. -> Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 1
Question 4.  A bidirectional 4-bit shift register is storing the nibble 1101. Its RIGHT/ LEFT 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
___________________.
  1.    1101
  2.    0111
  3.    0001
  4.    1110
 Discuss Question
Answer: Option B. -> 0111
Question 5.  What is a shift register that will accept a parallel input, or a bidirectional serial load and internal shift features, called?
  1.    tristate
  2.    end around
  3.    universal
  4.    conversion
 Discuss Question
Answer: Option C. -> universal
Question 6.  What does the output enable do on the 74395A chip?
  1.    It determines when data can be loaded.
  2.    It forces all outputs to go HIGH.
  3.    It forces all outputs to go LOW.
  4.    It activates the three-state buffer.
 Discuss Question
Answer: Option D. -> It activates the three-state buffer.
Question 7.  How can parallel data be taken out of a shift register simultaneously?
  1.    Use the Q output of the first FF.
  2.    Use the Q output of the last FF.
  3.    Tie all of the Q outputs together.
  4.    Use the Q output of each FF.
 Discuss Question
Answer: Option D. -> Use the Q output of each FF.
Question 8.  To operate correctly, starting a ring shift counter requires:
  1.    clearing all the flip-flops
  2.    presetting one flip-flop and clearing all others
  3.    clearing one flip-flop and presetting all others
  4.    presetting all the flip-flops
 Discuss Question
Answer: Option B. -> presetting one flip-flop and clearing all others
Question 9.  In a 6-bit Johnson counter sequence there are a total of how many states, or bit patterns?
  1.    2
  2.    6
  3.    12
  4.    24
 Discuss Question
Answer: Option C. -> 12
Question 10. . A modulus-12 ring counter requires a minimum of ________.
  1.    10 flip-flops
  2.    12 flip-flops
  3.    6 flip-flops
  4.    2 flip-flops
 Discuss Question
Answer: Option B. -> 12 flip-flops

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