Digital Electronics - Logic Gates

Exercise :: Logic Gates - General Questions

6. 

The output of an OR gate with three inputs, A, B, and C, is LOW when ________.

A. A = 0, B = 0, C = 0
B. A = 0, B = 0, C = 1
C. A = 0, B = 1, C = 1
D. all of the above

Answer: Option A

Explanation:

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7. 

Which of the following logical operations is represented by the + sign in Boolean algebra?

A. inversion
B. AND
C. OR
D. complementation

Answer: Option C

Explanation:

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8. 

Output will be a LOW for any case when one or more inputs are zero for a(n):

A. OR gate
B. NOT gate
C. AND gate
D. NOR gate

Answer: Option C

Explanation:

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9. 

How many pins does the 4049 IC have?

A. 14
B. 16
C. 18
D. 20

Answer: Option B

Explanation:

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10. 

Which of the following choices meets the minimum requirement needed to create specialized waveforms that are used in digital control and sequencing circuits?

A. basic gates, a clock oscillator, and a repetitive waveform generator
B. basic gates, a clock oscillator, and a Johnson shift counter
C. basic gates, a clock oscillator, and a DeMorgan pulse generator
D. basic gates, a clock oscillator, a repetitive waveform generator, and a Johnson shift counter

Answer: Option A

Explanation:

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