Digital Electronics - Logic Gates

Exercise :: Logic Gates - General Questions

61. 

How many entries would a truth table for a four-input NAND gate have?

A. 2
B. 8
C. 16
D. 32

Answer: Option C

Explanation:

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62. 

The Boolean expression for a 3-input OR gate is ________.

A. X = A + B
B. X = A + B + C
C. X = ABC
D. X = A + BC

Answer: Option B

Explanation:

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63. 

From the truth table for a three-input NOR gate, what is the only condition of inputs A, B, and C that will make the output X high?

A. A = 1, B = 1, C = 1
B. A = 1, B = 0, C = 0
C. A = 0, B = 0, C = 1
D. A = 0, B = 0, C = 0

Answer: Option D

Explanation:

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64. 

The logic gate that will have a LOW output when any one of its inputs is HIGH is the:

A. NAND gate
B. AND gate
C. NOR gate
D. OR gate

Answer: Option C

Explanation:

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65. 

The output of a NAND gate is LOW if ________.

A. all inputs are LOW
B. all inputs are HIGH
C. any input is LOW
D. any input is HIGH

Answer: Option B

Explanation:

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