Exercise: Digital Electronics

Questions for: Digital Electronics

The number of bits in EBCDIC is
A:
12
B:
10
C:
8
D:
6
Answer: C

EBCDIC is an 8 bit code.

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A 2 bit BCD D/A converter is a weighted resistor type with ER = 1V, R = 1 MĪ© and Rf = 10KĪ© then Resolution in percent and volt is __________ .
A:
1%, 1 mv
B:
10%, 10 mv
C:
10%, 1 mv
D:
1%, 10 mv
Answer: D

Resolution % for BCD = where d is Resolution in volts.

Resolution in volts =

volts per step = 0.01V 0r 10mV.

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The number of logic devices required in a Mod-16 synchronous counter are
A:
4
B:
5
C:
6
D:
7
Answer: C

4 flip-flops and 2 AND gates.

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Assertion (A): XOR gate is not universal gate.

Reason (R): It is not possible to realize any Boolean function using XOR gates only.

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: A

A universal gate is one which can be used to realize any Boolean function using that type of gates only. Only NOR and NAND are universal gates.

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The inputs A, B, C of the given figure are applied to a 3 input NOR gate. The output is
A:
HIGH from 4 to 0
B:
LOW from 0 to 4
C:
HIGH from 0 to 1 and LOW from 1 to 4
D:
LOW from 0 to 2 and HIGH from 2 to 4
Answer: C

NOR gate gives high output if all inputs are Low. For all other combinations of inputs, output is Low.

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