Digital Electronics And Logic Design Set 6
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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.
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.
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.
Q4 | The number 1000 would appear just immediately after
- ffff (hex)
- 1111
- 7777 (octal)
- all of the
Q5 | (1(10101)2 is
- (37)10
- ( 69)10
- (41 )10
- — (5)10
Q6 | The number of Boolean functions that can be generated by n variables is equal to
- 2n
- 22 n
- 2n-1
- — 2n
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.
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.
Q9 | Which of the following gate is a two-level logic gate
- or gate
- nand gate
- exclusiveor gate
- not 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.
Q11 | An OR gate has 6 inputs. The number of input words in its truth table are
- 6
- 32
- 64
- 128
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.
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
Q14 | Excess-3 code is known as
- weighted code
- cyclic
- self-
- algebraic
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
Q16 | X – = Y + 1 means
- x = x – y + 1
- x = –x – y – 1
- x = –x + y + 1
- x= x – y – 1
Q17 | A binary digit is called a
- bit
- byte
- number
- character
Q18 | The ASCII code for letter A is
- 1100011
- 1111111
- 1000001
- 10011
Q19 | Transistor is a
- current controlled current device.
- current controlled voltage device.
- voltage controlled current device.
- voltage controlled voltage 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
Q21 | What is the standard TTL noise margin?
- 5.0 v
- 0.2 v
- 0.8 v
- 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
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
Q24 | Which digital IC package type makes the most efficient use of printed circuit board space?
- smt
- to can
- flat pack
- dip
Q25 | The digital logic family which has minimum power dissipation is
- ttl
- rtl
- dtl
- cmos