Digital Electronics and Microprocessors - MCQS

Note: We have tried to upload as much as we can, all the question and answers might be shuffled - Please find the answer below each question, some answers might be wrong please review on the last date(some answers might be changed) if you find any of the answer is wrong please comment down below. 

Question

How many memory chips of (64 x 2) are needed to provide a memory capacity of 2048 x 8? 

A 32

B 128

C  4

D  16

Select one:

a. A

b. D

c. B

d. C

The correct answer is : 128

Question 

In 2's complement binary representation what is the magnitude of  these two numbers 1001    & 11001 

A   -6 & 6

B   9 & 25

C   -6 & -6

D   9 & -6

Select one:

a. C

b. D

c. B

d. A

The correct answer is : -6 & -6

Question

Minimum no. of  two input NAND gate required to implement a Ex-OR function is 

(A)2 (B)3

(C)4 (D)5

Select one:

a. A

b. D

c. B

d. C 

The correct answer is : 4

Question

What is the logic function implemented by the 2X1 mux shown below

A AND logic

B OR logic

C NAND logic

D Nor Logic

Select one:

a. d

b. A

c. c

d. b 

The correct answer is : OR logic

Question

In Boolean expression X+YZ equals 

(A)(X+Y)(X+Z) (B) (X'+Y)(X'+Z)

(C)(X+A)(X'+Z) (D) (X+Y)Z

Select one:

a. C

b. D

c. A

d. B

The correct answer is : (X+Y)(X+Z)

Question

If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output? 

A. 8                     B. 4                        C. 1                               D. 0 

Select one:

a. D

b. A

c. B

d. C

The correct answer is : 1

Question

A x-or B x-or C is equal to A x-Nor B x-Nor C for 

(A) A=0, B=1, C=0 (B) A=1, B=0, C=1

(C) A=1, B=1, C=1 (D) All of the above

Select one:

a. D

b. C

c. A

d. B 

The correct answer is : All of the above

Question

Gray code equivalent of (1000)2 is

(A) (1111)G (B) (1100)G

(C) (1000)G (D) None of these

Select one:

a. B

b. A

c. c

d. d 

The correct answer is : (1111)G

Question

What is the POS of the function F(A, B, C, D) = ∑(0, 1, 2, 5, 8, 9, 10) 

A   (A’+B’) .(C’+D’) .(B’+D)

B   (A’+B’) .(C+D’) .(B’+D)

C  (A+B) .(C’+D’) .(B’+D)

D  (A’+B’) .(C’+D’) .(B+D)

Select one:

a. D

b. C

c. A

d. B

The correct answer is : (A’+B’) .(C’+D’) .(B’+D)

Question

What is the minimum number of  2 to 4 decoders with enable inputs are required to implement a 4 to 16 decoder

A 4

B 16

C 5 

D 8

Select one:

a. B

b. C

c. D

d. A

The correct answer is : 5