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Logic Gates

71.

A NOR gate output is LOW if any of its inputs is LOW.

Answer: B

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72.

Which of the following gates are added to the inputs of the OR gate to convert it to the NAND gate ?

Answer: A

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73.

A one-to-four line demultiplexer is to be implemented using a memory. How many bits must each word have ?

Answer: A

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74.

A truth table illustrates how the input level of a gate responds to all the possible output level combinations.

Answer: B

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Answer: B

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76.

If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

Answer: A

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77.

The time required for a pulse to decrease from 90 to 10 per cent of its maximum value is called

Answer: B

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78.

A small dot or circle printed on top of an IC indicates

Answer: D

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79.

What is the largest number of data inputs which a data selector with two control inputs can have ?

Answer: B

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Answer: D

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