Exercise: Digital Electronics

Questions for: Digital Electronics

A 4 : 1 multiplexer requires __________ data select line.
A:
1
B:
2
C:
3
D:
4
Answer: B

22 = 4. Hence 2 select lines.

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In a D latch
A:
data bit D is fed to S input and D to R input
B:
data bit D is fed to R input and D to S input
C:
data bit D is fed to both R and S inputs
D:
data bit D is not fed to any input
Answer: A

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4 bit 2's complement representation of a decimal number is 1000. The number is
A:
+ 8
B:
0
C:
- 7
D:
- 8
Answer: D

(a) and (d) both are option, But there is meaning to represent a positive number in 2's complement form, we take complement representation for negative number only. Therefore most appropriate number is "-8".

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The number of bits in ASCII is
A:
12
B:
10
C:
9
D:
7
Answer: D

ASCII is a 7 bit code.

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Assertion (A): The output of a NOR gate is equal to the complement of OR of input variables.

Reason (R): A XOR gate is a universal gate.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is true, R is false
D:
A is false, R is true
Answer: C

XOR gate is not a universal gate.

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