Top 350+ Solved Digital Electronics and Logic Design MCQ Questions Answer
Q. 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?
a. two’s complement only
b. sign and magnitude and one’s complement only
c. two’s complement and one’s complement only
d. all three representa tions.
Q. Positive logic in a logic circuit is one in which
a. logic 0 and 1 are represented by 0 and positive voltage respectively
b. logic 0 and, - 1 are represented by negative and positive voltages respectively
c. logic 0 voltage level is higher than logic 1 voltage level
d. logic 0 voltage level is lower than logic 1 voltage level.
Q. Which of the following gate is a two-level logic gate
a. or gate
b. nand gate
c. exclusiveor gate
d. not gate.
Q. An AND gate will function as OR if
a. all the inputs to the gates are “1”
b. all the inputs are ‘0’
c. either of the inputs is “1”
d. all the inputs and outputs are compleme nte
Q. An OR gate has 6 inputs. The number of input words in its truth table are
a. 6
b. 32
c. 64
d. 128
Q. NAND. gates are preferred over others because these
a. have lower fabrication area
b. can be used to make any gate
c. consume least electronic power
d. provide maximum density in a chip.
Q. In case of OR gate, no matter what the number of inputs, a
a. 1 at any input causes the
b. 1 at any input causes
c. 0 any input causes the
d. 0 at any input
Q. Indicate which of the following three binary additions are correct? 1.1011 + 1010 = 10101II. 1010 + 1101 = 10111III. 1010 + 1101 = 11111
a. i and ii
b. ii and iii
c. iii only
d. ii and i
Q. Transistor is a
a. current controlled current device.
b. current controlled voltage device.
c. voltage controlled current device.
d. voltage controlled voltage device.
Q. A digital logic device used as a buffer should have what input/output characteristics?
a. high input impedance and high output impedance
b. low input impedance and high output impedance
c. low input impedance and low output impedance
d. high input impedance and low output impedance