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600+ Digital Electronics and Logic Design Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Electronics and Telecommunication Engineering [ENTC] .

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51.

Convert the octal number 7401 to Binary.

A. 1.111e+11
B. 1.1111e+11
C. 1.111e+11
D. 1.11e+11
Answer» A. 1.111e+11
discuss
52.

Find the hex sum of (93)16 + (DE)16 .

A. (171)16
B. (271)16
C. (179)16
D. (181)16
Answer» A. (171)16
discuss
53.

Perform 2’s complement subtraction of (7)10 − (11)10 .

A. 1100 (or -4)
B. 1101 (or -5)
C. 1011 (or -3)
D. 1110 (or -6)
Answer» A. 1100 (or -4)
discuss
54.

What is the Gray equivalent of (25)10

A. 1101
B. 110101
C. 10110
D. 10101
Answer» D. 10101
discuss
55.

Simplify the Boolean expression F = C(B + C)(A + B + C).

A. c
B. bc
C. abc
D. a+bc
Answer» A. c
discuss
56.

Simplify the following expression into sum of products using Karnaugh map F(A,B,C,D) = (1,3,4,5,6,7,9,12,13)

A. a\b+c\ d+ a\d+bc\
B. a\b\+c\ d\+ a\d\+b\c\
C. a\b\+c\ d+ a\d+bc\
D. a\b+c\ d\+ a\d\+bc\
Answer» A. a\b+c\ d+ a\d+bc\
discuss
57.

Simplify F = (ABC)'+( AB)'C+ A'BC'+ A(BC)'+ AB'C.

A. ( a\ + b\ +c\ )
B. ( a\ + b +c )
C. ( a + b +c )
D. ( a + b\ +c\ )
Answer» A. ( a\ + b\ +c\ )
discuss
58.

Determine the binary numbers represented by 25.5

A. 11001.1
B. 11011.101
C. 10101.11
D. 11001.010 1
Answer» A. 11001.1
discuss
59.

Conversion of decimal number 10.625 into binary number:

A. 1010.101
B. 1110.101
C. 1001.11
D. 1001.101
Answer» A. 1010.101
discuss
60.

Conversion of fractional number 0.6875 into its equivalent binary number:

A. 0.1011
B. 0.1111
C. 0.10111
D. 0.0101
Answer» A. 0.1011
discuss
61.

Perform the following subtractions using 2’s complement method. 01000 – 01001

A. 1
B. 10
C. 11
D. 11110
Answer» A. 1
discuss
62.

Subtraction of 01100-00011 using 2’s complement method. :

A. 1001
B. 1000
C. 1010
D. 110
Answer» A. 1001
discuss
63.

Minimize the logic functionY(A,B,C,D) = IZm(0,1,2,3,5,7,8,9,11,14) . Using Karnaugh map.

A. abc d\ + a\ b\ + b\ c\ + b\ d+ a\d
B. abc d + a b + b\ c\ + b\ d+ a\d
C. a\ b\ + b\ c\ + b\ d+ a\d
D. abc d\ + a\ b\ + b\ c\ + b\ d
Answer» A. abc d\ + a\ b\ + b\ c\ + b\ d+ a\d
discuss
64.

Simplify the given expression to its Sum of Products (SOP) form Y = (A + B)(A + (AB)')C + A'(B+C')+ A'B+ ABC

A. ac+ bc+ a\b + a\ c\
B. ac+ bc+ a\b
C. bc+ a\b + a\ c\
D. ac+ a\b + a\ c\
Answer» A. ac+ bc+ a\b + a\ c\
discuss
65.

Convert the decimal number 82.67 to its binary, hexadecimal and octal equivalents

A. (1010010.1010 1011)2; (52.ab)16 ;
B. (1010010.10 101011)2; (52.ab)16 ;
C. (1010010.10 101011)2; (52.ab)16 ;
D. (1010010.
Answer» A. (1010010.1010 1011)2; (52.ab)16 ;
discuss
66.

Add 20 and (-15) using 2’s complement.

A. (100100 )2 or (+4)10
B. (000100 )2 or (-4)10
C. both (a) and (b)
D. none of the above
Answer» A. (100100 )2 or (+4)10
discuss (1)
67.

Add 648 and 487 in BCD code.

A. 1135
B. 1136
C. 1235
D. 1138
Answer» A. 1135
discuss
68.

(23.6)10 = (X)2 FIND X

A. (10111.100110 0)2
B. (10101.1001 100)2
C. (10001.1001 100)2
D. (10111.10 00011)2
Answer» A. (10111.100110 0)2
discuss
69.

(65.535)10 =(X)16 FIND X

A. (41.88f5c28)16 .
B. (42.88f5c28 )16.
C. (41.88f5c)16.
D. (42.88f5c )16.
Answer» A. (41.88f5c28)16 .
discuss
70.

Convert the decimal number 430 to Excess-3 code:

A. 110110001
B. 110110000
C. 110110011
D. 11010000 1
Answer» A. 110110001
discuss
71.

Minimize the following logic function using K-maps F(A,B,C,D) = m(1,3,5,8,9,11,15) + d(2,13)

A. a b\ c\ + c\ d + b\d + ad
B. c\ d + b\d + ad
C. a b\ c\ + b\d + ad
D. a b\ c\ + c\ d + b\d
Answer» A. a b\ c\ + c\ d + b\d + ad
discuss
72.

Convert (2222)10 in Hexadecimal number.

A. 8ae
B. 8be
C. 93c
D. fff
Answer» A. 8ae
discuss
73.

Divide ( 101110) 2 by ( 101)2.

A. quotient -1001 remainder - 001
B. quotient - 1000 remainder - 001
C. quotient - 1001 remainder - 011
D. quotient - 1001 remainder -000
Answer» A. quotient -1001 remainder - 001
discuss
74.

Minimise the logic function (POS Form) F A,B,C,D) = PI M (1, 2, 3, 8, 9, 10, 11,14)× d (7, 15)

A. f=[(b+d’)+(b+ c’)’(a’+c’)+(a’ +b)]’
B. f=[(b+d’)+(b +c’)’(‘a’+c’)+ (a’+b)]’
C. f=[(b+d’)+(b +c’)’(‘a’+c’)+ (a’+b)]’
D. f=[(b+d’)+ (b+c’)’(‘a’ +c’)+(a’+b )]’
Answer» A. f=[(b+d’)+(b+ c’)’(a’+c’)+(a’ +b)]’
discuss
75.

Perform following subtraction (i) 11001-10110 using 1’s complement

A. 11
B. 111
C. 10
D. 10011
Answer» A. 11
discuss
76.

Perform following subtraction(ii) 11011-11001 using 2’s complement

A. 10
B. 111
C. 11
D. 10011
Answer» A. 10
discuss
77.

Reduce the following equation using k-map Y = (ABC)'+ A(CD)'+ AB'+ ABCD'+ (AB)'C

A. b\+(ad)\
B. b\
C. (ad)\
D. b\+ad
Answer» A. b\+(ad)\
discuss
78.

Write the expression for Boolean function F (A, B, C) = m (1,4,5,6,7) in standard POS form.

A. = (a+b+c)(a+b\ +c)(a+b\ +c\ )
B. = (a+b\ +c)(a+b\ +c\ )
C. = (a+b+c)(a+b \ +c)
D. = (a+b+c)(a +b\ +c\ )
Answer» A. = (a+b+c)(a+b\ +c)(a+b\ +c\ )
discuss
79.

Convert the decimal number 45678 to its hexadecimal equivalent number.

A. (b26e)16
B. (a26e)16
C. (b26b)16
D. (b32e)16
Answer» A. (b26e)16
discuss
80.

Convert (177.25)10 to octal.

A. (261.2)8
B. (260.2)8
C. (361.2)8
D. (251.2)8
Answer» A. (261.2)8
discuss
81.

Reduce the following equation using k-map Y = B C' D'+ A' B C' D+ A B C' D+ A' B C D+ A B C D

A. bc’ + bd
B. bc’ + bd+a
C. bc’ + bd + ac
D. bc’ + bd + ad
Answer» A. bc’ + bd
discuss
82.

8-bit 1’s complement form of –77.25 is

A. 1001101.01
B. 10110010.10 11
C. 01001101.00 10
D. 10110010
Answer» B. 10110010.10 11
discuss
83.

In computers, subtraction is generally carried out by

A. 9’s complement
B. 10’s complement
C. 1’s complement
D. 2’s compleme nt
Answer» D. 2’s compleme nt
discuss
84.

The answer of the operation (10111)2*(1110)2 in hex equivalence is

A. 150
B. 241
C. 142
D. 10101111 0
Answer» C. 142
discuss
85.

The decimal number equivalent of (4057.06)8 is

A. 2095.75
B. 2095.075
C. 2095.937
D. 2095.094
Answer» D. 2095.094
discuss
86.

12-bit 2’s complement of –73.75 is

A. 01001001.110 0
B. 11001001.11 00
C. 10110110.01 00
D. 10110110. 1100
Answer» C. 10110110.01 00
discuss
87.

What is decimal equivalent of BCD 11011.1100 ?

A. 22
B. 22.2
C. 20.2
D. 21.2
Answer» B. 22.2
discuss
88.

What is the binary equivalent of the decimal number 368

A. 101110000
B. 110110000
C. 111010000
D. 11110000 0
Answer» A. 101110000
discuss
89.

(2FAOC)16 is equivalent to

A. (195 084)10
B. (001011111 010 0000 1100)2
C. both (a) and (b)
D. none of these
Answer» B. (001011111 010 0000 1100)2
discuss
90.

The octal equivalent of hexadecimal (A.B)16 is

A. 47.21
B. 12.74
C. 12.71
D. 17.21
Answer» B. 12.74
discuss
91.

Logic X-OR operation of (4ACO)H & (B53F)H results

A. aacb
B. 0
C. ffff
D. abcd
Answer» C. ffff
discuss
92.

The simplified form of the Boolean expression (X+Y+XY)(X+Z) is

A. x + y + zx + y
B. xy – yz
C. x + yz
D. xz + y
Answer» C. x + yz
discuss
93.

The output of a logic gate is 1 when all its inputs are at logic 0. the gate is either

A. nand or an xo
B. or or an xn
C. o an and or xor
D. a nor or an xnor
Answer» D. a nor or an xnor
discuss
94.

2's complement of any binary number can be calculated by

A. adding 1\s complement twice
B. adding 1 to 1\s complement
C. subtracting 1 from 1\s complement.
D. calculating 1\s compleme nt and inverting most significant bit
Answer» B. adding 1 to 1\s complement
discuss
95.

Sum-of-Weights method is used                   

A. to convert from one number system to other
B. to encode data
C. to decode data
D. to convert from serial to parralel data
Answer» A. to convert from one number system to other
discuss
96.

The complement of a variable is always

A. 1
B. 0
C. inverse
D. none
Answer» C. inverse
discuss
97.

The difference of 111 - 001 equals

A. 100
B. 111
C. 1
D. 110
Answer» D. 110
discuss (2)
98.

The Unsigned Binary representation can only represent positive binary numbers

A. true
B. false
C. both (a) and (b)
D. none of above
Answer» A. true
discuss
99.

which of the following rules states that if one input of an AND gate is always 1, the output is equal to the other input?

A. a +1 =1
B. a +a =a
C. a.a = a
D. a.1= a
Answer» C. a.a = a
discuss
100.

Which of the number is not a representative of hexadecimal system

A. 1234
B. abcd
C. 1001
D. defh
Answer» D. defh
discuss

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