Free Printable DIGITAL ELECTRONICS REVISION

1.

A function F(A, B, C) defined by three Boolean variables A, B and C when expressed as sum of products is given by

F=A'B'C'+A'BC'+AB'C'

The product of sums (POS) form of the function F is (GATE 2018)

a)

(A+B+C)(A+B'+C)(A'+B+C)(A+B'+C')

b)

(A+B+C')(A+B'+C')(A'+B'+C)+(A'+B'+C')

2.

For an n - variable Boolean function maximum number of prime implicants is (GATE 2014)

(a)

3.

The output of the combinational circuit given is (GATE 2016)

a)

A+B+C

b)

A(B+C)

c)

B(C+A)

d)

C(A+B)

4.

In the figure shown, the output ܻ is required to be ܻ Y=AB+ C'D'.The gates G1 and G2 must be, respectively, (GATE 2015)

a)

NOR,OR

b)

OR,NAND

c)

NAND,OR

d)

AND,NAND

5.

Following is the k-map of a Boolean function of five variable P, Q, R, S and X. The minimum for the function is

(GATE 2016)

a)

P'Q'SX'+PQ'SX'+QR'S'X+QRS'X

b)

Q'SX'+QS'X

c)

Q'SX+QS'X'

d)

Q'S+QS'

6.

Decimal 43 in Hexadecimal and BCD number system is respectively (GATE 2015)

a)

B2, 0100 0011

b)

2B, 0100 0011

c)

2B, 0001 1100

d)

B2,0100 0100

7.

The Boolean expression (X+Y) (X+Y')+(XY')'+(X')'simplifies to (GATE 2014)

a)

X

b)

Y

c)

XY

d)

X+Y

8.

In the sum of products function f (x,y,z) = ∑m (2,3,4,5), the prime implicants are (GATE 2013)

a)

X'Y,XY'

b)

X'Y,XY'Z',XY'Z

9.

The Boolean expression for the truth table shown is (GATE 2014)

a)

B(A+C)(A'+C')

b)

B(A+C')(A'+C)

10.

The number of distinct Boolean expressions of 4 variables is (GATE 2003)

a)

16

b)

256

c)

1024

d)

65536

11.

HOW IS MY TEACHING?

a)

GOOD

b)

AVERAGE

c)

BAD

d)

VERY BAD

DIGITAL ELECTRONICS REVISION

Total questions: 11

Worksheet time: 8mins

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