Digital Electronics - Digital Concepts

Exercise :: Digital Concepts - General Questions

16. 

Which of the following is not an analog device?

A. Thermocouple
B. Current flow in a circuit
C. Light switch
D. Audio microphone

Answer: Option C

Explanation:

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17. 

A demultiplexer has ________.

A. one data input and a number of selection inputs, and they have several outputs
B. one input and one output
C. several inputs and several outputs
D. several inputs and one output

Answer: Option A

Explanation:

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18. 

A flip-flop has ________.

A. one stable state
B. no stable states
C. two stable states
D. none of the above

Answer: Option C

Explanation:

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19. 

Digital signals transmitted on a single conductor (and a ground) must be transmitted in:

A. slow speed.
B. parallel.
C. analog.
D. serial.

Answer: Option D

Explanation:

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20. 

In a certain digital waveform, the period is four times the pulse width. The duty cycle is ________.

A. 0%
B. 25%
C. 50%
D. 100%

Answer: Option B

Explanation:

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