Exercise: Digital Electronics

Questions for: Digital Electronics

The total number of input words for 4 input OR gate is
A:
20
B:
16
C:
12
D:
8
Answer: B

24 = 16.

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In a mod-12 counter the input clock frequency is 10 kHz. The output frequency is
A:
0.833 kHz
B:
1.0 kHz
C:
0.91 kHz
D:
0.77 kHz
Answer: A

Mod-12 counter is divide by 12 counter. Output frequency = = 0.833 kHz.

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In a 3 input NAND gate, the number of states in which output is 0 equals
A:
8
B:
1
C:
6
D:
5
Answer: B

Only one input, i.e., A = 1, B = 1 and C = 1 gives low output.

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A VF display operates on the principle of a vacuum diode.
A:
True
B:
False
C:
D:
Answer: B

It operates on the principle of vacuum triode.

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The number of inputs and outputs of a full adder are
A:
3 and 2 respectively
B:
2 and 3 respectively
C:
4 and 2 respectively
D:
2 and 4 respectively
Answer: A

Inputs are carry from lower bits and two other bits. Outputs are SUM and CARRY.

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