Digital Electronics And Logic Design Set 6

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 6

Q1 | A NAND gate is called a universal logic element because
  • it is used by everybody
  • any logic function can be realized by nand gates alone
  • all the minization techniques are applicable for optimum nand gate realization
  • many digital computers use nand gates.
Answer: any logic function can be realized by nand gates alone
Q2 | Digital computers are more widely used as compared to analog computers, because they are
  • less expensive
  • always more accurate and faster
  • useful over wider ranges of problem types
  • easier to maintain.
Answer: useful over wider ranges of problem types
Q3 | Most of the digital computers do not have floating point hardware because
  • floating point hardware is costly
  • it is slower than software
  • it is not possible to perform floating point addition by hardware
  • of no specific reason.
Answer: floating point hardware is costly
Q4 | The number 1000 would appear just immediately after
  • ffff (hex)
  • 1111
  • 7777 (octal)
  • all of the
Answer: all of the
Q5 | (1(10101)2 is
  • (37)10
  • ( 69)10
  • (41 )10
  • — (5)10
Answer: (37)10
Q6 | The number of Boolean functions that can be generated by n variables is equal to
  • 2n
  • 22 n
  • 2n-1
  • — 2n
Answer: 22 n
Q7 | Consider the representation of six-bit numbers by two’s complement, one’scomplement, or by sign and magnitude: In which representation is there overflow fromthe addition of the integers 011000 and 011000?
  • two’s complement only
  • sign and magnitude and one’s complement only
  • two’s complement and one’s complement only
  • all three representa tions.
Answer: all three representa tions.
Q8 | Positive logic in a logic circuit is one in which
  • logic 0 and 1 are represented by 0 and positive voltage respectively
  • logic 0 and, - 1 are represented by negative and positive voltages respectively
  • logic 0 voltage level is higher than logic 1 voltage level
  • logic 0 voltage level is lower than logic 1 voltage level.
Answer: logic 0 voltage level is lower than logic 1 voltage level.
Q9 | Which of the following gate is a two-level logic gate
  • or gate
  • nand gate
  • exclusiveor gate
  • not gate.
Answer: exclusiveor gate
Q10 | An AND gate will function as OR if
  • all the inputs to the gates are “1”
  • all the inputs are ‘0’
  • either of the inputs is “1”
  • all the inputs and outputs are compleme nted.
Answer: all the inputs and outputs are compleme nted.
Q11 | An OR gate has 6 inputs. The number of input words in its truth table are
  • 6
  • 32
  • 64
  • 128
Answer: 64
Q12 | NAND. gates are preferred over others because these
  • have lower fabrication area
  • can be used to make any gate
  • consume least electronic power
  • provide maximum density in a chip.
Answer: can be used to make any gate
Q13 | In case of OR gate, no matter what the number of inputs, a
  • 1 at any input causes the
  • 1 at any input causes
  • 0 any input causes the
  • 0 at any input
Answer: 1 at any input causes the
Q14 | Excess-3 code is known as
  • weighted code
  • cyclic
  • self-
  • algebraic
Answer: self-
Q15 | Indicate which of the following three binary additions are correct? 1.1011 + 1010 = 10101II. 1010 + 1101 = 10111III. 1010 + 1101 = 11111
  • i and ii
  • ii and iii
  • iii only
  • ii and i
Answer: ii and i
Q16 | X – = Y + 1 means
  • x = x – y + 1
  • x = –x – y – 1
  • x = –x + y + 1
  • x= x – y – 1
Answer: x = x – y + 1
Q17 | A binary digit is called a
  • bit
  • byte
  • number
  • character
Answer: bit
Q18 | The ASCII code for letter A is
  • 1100011
  • 1111111
  • 1000001
  • 10011
Answer: 1000001
Q19 | Transistor is a
  • current controlled current device.
  • current controlled voltage device.
  • voltage controlled current device.
  • voltage controlled voltage device.
Answer: current controlled current device.
Q20 | A digital logic device used as a buffer should have what input/output characteristics?
  • high input impedance and high output impedance
  • low input impedance and high output impedance
  • low input impedance and low output impedance
  • high input impedance and low output impedance
Answer: high input impedance and low output impedance
Q21 | What is the standard TTL noise margin?
  • 5.0 v
  • 0.2 v
  • 0.8 v
  • 0.4 v
Answer: 0.4 v
Q22 | The range of a valid LOW input is:
  • 0.0 v to 0.4 v
  • 0.4 v to 0.8 v
  • 0.0 v to 1.8 v
  • 0.0 v to2.8 v
Answer: 0.4 v to 0.8 v
Q23 | When an IC has two rows of parallel connecting pins, the device is referred to as:
  • a qfp
  • a dip
  • a phase splitter
  • cmos
Answer: a dip
Q24 | Which digital IC package type makes the most efficient use of printed circuit board space?
  • smt
  • to can
  • flat pack
  • dip
Answer: smt
Q25 | The digital logic family which has minimum power dissipation is
  • ttl
  • rtl
  • dtl
  • cmos
Answer: cmos
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