Digital Electronics And Logic Design Set 5

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 5

Q1 | Which one of the following is NOT a valid rule of Boolean algebra?
  • a = a\
  • aa = a
  • a + 1 = 1
  • a + 0 = a
Answer: a = a\
Q2 | In the binary number ' 10011 ' the weight of the most significant digit is
  • 2^4(2 raise to power 4)
  • 2^3 (2raise to power 3)
  • 2^0 (2raise to power 0)
  • 2^1 (2raise to power 1)
Answer: 2^4(2 raise to power 4)
Q3 | The binary value ' 1010110 ' is equivalent to decimal                   
  • 86
  • 87
  • 88
  • 89
Answer: 86
Q4 | 2's complement of hexadecimal number B70A is
  • b70b
  • b709
  • 48f6
  • 48f5
Answer: 48f6
Q5 | 2's complement of 5 is
  • 1101
  • 1011
  • 1010
  • 1100
Answer: 1011
Q6 | The 4-bit 2's complement representation of ' -7 ' is                        
  • 111
  • 1111
  • 1001
  • 110
Answer: 1001
Q7 | If we multiply ' 723 ' and ' 34 ' by representing them in floating point notation i.e. By first, converting them in floating point representation and then multiplying them, the value of mantissa of result will be                
  • 24.582
  • 2.4582
  • 24582
  • 0.24582
Answer: 24.582
Q8 | The output of the expression F=A+B+C will be Logic when A=0, B=1, C=1. the symbol ' + ' here represents OR Gate.
  • undefined
  • one
  • zero
  • 10(binary)
Answer: one
Q9 | A NAND gate's output is LOW if
  • all inputs are low
  • all inputs are high
  • any input is low
  • any input is high
Answer: any input is low
Q10 | NOR gate is formed by connecting                 
  • or gate and then not gate
  • not gate and then or gate
  • and gate and then or gate
  • or gate and then and gate
Answer: and gate and then or gate
Q11 | The AND Gate performs a logical function
  • addition
  • subtraction
  • multiplicatio
  • division
Answer: multiplicatio
Q12 | The Extended ASCII Code (American Standard Code for Information Interchange) is a code
  • 2-bit
  • 7-bit
  • 8-bit
  • 16-bit
Answer: 8-bit
Q13 | The OR gate performs Boolean .
  • multiplication
  • subtraction
  • division
  • addition
Answer: addition
Q14 | The output of an AND gate is one when              
  • all of the inputs are one
  • any of the input is one
  • any of the input is zero
  • all the inputs arezero
Answer: all of the inputs are one
Q15 | A NOR's gate output is HIGH if
  • all inputs are high
  • any input is high
  • any input is low
  • all inputs arelow
Answer: all inputs arelow
Q16 | A logic circuit with an output X = A(Bar)BC+AB(Bar) consists of .
  • two and gates, two orgates, two inverters
  • three and gates, two or gates, one inverter
  • two and gates, oneor gate, two inverters
  • two andgates, one or gate
Answer: two and gates, oneor gate, two inverters
Q17 | the boolean expression AB'CD'is
  • a sumterm
  • a product ter
  • a literal ter
  • m always 1
Answer: a product ter
Q18 | The boolean expression X = AB + CD represents
  • two ors anded together
  • a 4-input and gate
  • two ands ored together
  • an exclusive- or
Answer: two ands ored together
Q19 | The expression is an example of Commutative Law for Multiplication.
  • ab+c = a+bc
  • a(b+c) = b(a+c)
  • ab=ba
  • a+b=b+a
Answer: ab=ba
Q20 | The total amount of memory that is supported by any digital system depends upon            
  • the organization of memory
  • the structure of memory
  • the size of decoding unit
  • the size of the address bus of the microproc essor
Answer: the size of the address bus of the microproc essor
Q21 | Addition of two octal numbers “36” and “71” results in                
  • 213
  • 123
  • 127
  • 345
Answer: 127
Q22 | In which of the following base systems is 123 not a valid number?
  • base 10
  • base 16
  • base8
  • base 3
Answer: base 3
Q23 | Storage of 1 KB means the following number of bytes
  • 1000
  • 964
  • 1024
  • 1064
Answer: 1064
Q24 | What is the octal equivalent of the binary number: 10111101
  • 675
  • 275
  • 572
  • 573
Answer: 275
Q25 | The binary code of (21.125)10 is
  • 10101.001
  • 10100.001
  • 10101.01
  • 10100.111
Answer: 10101.001
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