Digital Electronics - Counters

Exercise :: Counters - General Questions

61. 

A principle regarding most display decoders is that when the correct input is present, the related output will switch:

A. HIGH
B. to high impedance
C. to an open
D. LOW

Answer: Option D

Explanation:

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62. 

A modulus-10 counter must have ________.

A. 10 flip-flops
B. flip-flops
C. 2 flip-flops
D. synchronous clocking

Answer: Option B

Explanation:

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63. 

For a one-shot application, how can HDL code be used to make a circuit respond once to each positive transition on its trigger input?

A. By using a counter
B. By using an active clock
C. By using an immediate reload
D. By using edge trapping

Answer: Option D

Explanation:

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64. 

Which is not an example of a truncated modulus?

A. 8
B. 9
C. 11
D. 15

Answer: Option A

Explanation:

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65. 

Four cascaded modulus-10 counters have an overall modulus of ________.

A. 10
B. 100
C. 1,000
D. 10,000

Answer: Option D

Explanation:

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66. 

What is the maximum delay that can occur if four flip-flops are connected as a ripple counter and each flip-flop has propagation delays of tPHL = 22 ns and tPLH = 15 ns?

A. 15 ns
B. 22 ns
C. 60 ns
D. 88 ns

Answer: Option D

Explanation:

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