DIGITAL ELECTRONICS QUIZ

The voltages corresponding to LOW and HIGH levels respectively are given below. Identify the voltages which correspond to positive logic system.

5 V and 0 V

–1.5 V and – 5 V

1 V and -5 V

0 V and 5 V

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the logic which controls a stair case light associated with two switches A and B located at the bottom and top of the stair case respectively?

AND

X-OR

X-NOR

OR

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For the design of a combinational circuit with four inputs using only NAND gates, the number of K-maps required for the simplification process is

1

2

4

0

TRUE ANSWER : ?
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The number A = 01110000 and B = 10101111 are in 2’s complement form .Addition of above two number is

011100001

10101111

00011111

11100000

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A full adder has

3 inputs, 1 output

3 inputs, 2 outputs

2 inputs, 1 output

2 inputs, 2 outputs

TRUE ANSWER : ?
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The binary number 10101 is equivalent to decimal number ___________.

27

21

12

19

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The implicants which will definitely occur in the final expression are called

essential prime implicants

redundent prime implicants

selective prime implicants

prime implicants

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The data bus width of a ROM of size 2048 × 8 bits is

8

10

16

12

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The NOR gate can function as a NOT gate if

all inputs are connected together

inputs are left open

one input is set to 1

one input is set to 0

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The universal gate is ___________

AND gate

OR gate

NAND gate

None of these

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