Digital Electronics And Logic Design Set 4

Computer Science Engineering (CSE),

Electronics and Telecommunication Engineering [ENTC]

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This set of Digital Electronics and Logic Design Multiple Choice Questions & Answers (MCQs) focuses on Digital Electronics And Logic Design Set 4

Q1 | Perform following subtraction(ii) 11011-11001 using 2’s complement
  • 10
  • 111
  • 11
  • 10011
Answer: 10
Q2 | Reduce the following equation using k-map Y = (ABC)'+ A(CD)'+ AB'+ ABCD'+ (AB)'C
  • b\+(ad)\
  • b\
  • (ad)\
  • b\+ad
Answer: b\+(ad)\
Q3 | Write the expression for Boolean function F (A, B, C) = m (1,4,5,6,7) in standard POS form.
  • 0
  • 0
  • 0
  • 0
Answer: 0
Q4 | Convert the decimal number 45678 to its hexadecimal equivalent number.
  • (b26e)16
  • (a26e)16
  • (b26b)16
  • (b32e)16
Answer: (b26e)16
Q5 | Convert (177.25)10 to octal.
  • (261.2)8
  • (260.2)8
  • (361.2)8
  • (251.2)8
Answer: (261.2)8
Q6 | 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
  • bc’ + bd
  • bc’ + bd+a
  • bc’ + bd + ac
  • bc’ + bd + ad
Answer: bc’ + bd
Q7 | 8-bit 1’s complement form of –77.25 is
  • 1001101.01
  • 10110010.1011
  • 01001101.0010
  • 10110010
Answer: 10110010.1011
Q8 | In computers, subtraction is generally carried out by
  • 9’s complement
  • 10’scomplement
  • 1’s complement
  • 2’s compleme nt
Answer: 2’s compleme nt
Q9 | The answer of the operation (10111)2*(1110)2 in hex equivalence is
  • 150
  • 241
  • 142
  • 101011110
Answer: 142
Q10 | The decimal number equivalent of (4057.06)8 is
  • 2095.75
  • 2095.075
  • 2095.937
  • 2095.094
Answer: 2095.094
Q11 | 12-bit 2’s complement of –73.75 is
  • 01001001.1100
  • 11001001.1100
  • 10110110.0100
  • 10110110.1100
Answer: 10110110.0100
Q12 | What is decimal equivalent of BCD 11011.1100 ?
  • 22
  • 22.2
  • 20.2
  • 21.2
Answer: 22.2
Q13 | What is the binary equivalent of the decimal number 368
  • 101110000
  • 110110000
  • 111010000
  • 111100000
Answer: 101110000
Q14 | (2FAOC)16 is equivalent to
  • (195 084)10
  • (001011111010 00001100)2
  • both (a) and (b)
  • none of these
Answer: (001011111010 00001100)2
Q15 | The octal equivalent of hexadecimal (A.B)16 is
  • 47.21
  • 12.74
  • 12.71
  • 17.21
Answer: 12.74
Q16 | Logic X-OR operation of (4ACO)H & (B53F)H results
  • aacb
  • 0
  • ffff
  • abcd
Answer: ffff
Q17 | The simplified form of the Boolean expression (X+Y+XY)(X+Z) is
  • x + y + zx + y
  • xy – yz
  • x + yz
  • xz + y
Answer: x + yz
Q18 | The output of a logic gate is 1 when all its inputs are at logic 0. the gate is either
  • nand or an xo
  • or or an xn
  • o an and orxor
  • a nor or an xnor
Answer: a nor or an xnor
Q19 | 2's complement of any binary number can be calculated by
  • adding 1\s complementtwice
  • adding 1 to 1\scomplement
  • subtracting 1 from 1\s complement.
  • calculating 1\s compleme nt and inverting most significant bit
Answer: adding 1 to 1\scomplement
Q20 | Sum-of-Weights method is used                   
  • to convert from one numbersystem to other
  • to encode data
  • to decode data
  • to convertfrom serial to parralel data
Answer: to convert from one numbersystem to other
Q21 | The complement of a variable is always
  • 1
  • 0
  • inverse
  • none
Answer: inverse
Q22 | The difference of 111 - 001 equals
  • 100
  • 111
  • 1
  • 110
Answer: 110
Q23 | The Unsigned Binary representation can only represent positive binary numbers
  • true
  • false
  • both (a) and (b)
  • none of above
Answer: true
Q24 | 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 +1 =1
  • a +a =a
  • a.a = a
  • a.1= a
Answer: a.a = a
Q25 | Which of the number is not a representative of hexadecimal system
  • 1234
  • abcd
  • 1001
  • defh
Answer: defh
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