Top 350+ Solved Digital Electronics and Logic Design MCQ Questions Answer
Q. In the following question, match each of the items A, B and C on the left with an approximation item on the rightA. Shift register can be used 1. for code conversionB. A multiplexer can be used 2. to generate memory slipto selectC. A decoder can be used 3. for parallel to serial conversion4. as many to one switch5. for analog to digital conversion
a. a b c1 2 3
b. a b c3 4 1
c. a b c5 4 2
d. a b c1 3 5
Q. A standard SOP form has terms that have all the variables in the domain of the expression.
a. sum
b. sub
c. mult
d. div
Q. Half adder circuit is ?
a. half of an and gate
b. a circuit to add two bits together
c. half of a nand gate
d. none of above
Q. The full adder adds the Kth bits of two numbers to the
a. difference of the previous bits
b. sum of all previous bits
c. carry from ( k - 1 )th bit
d. sum of previous bit
Q. The number of two input multiplexers required to construct a 210 input multiplexer is,
a. 31
b. 10
c. 127
d. 1023
Q. Which of the following adders can add three or more numbers at a time ?
a. parallel adder
b. carry-look- ahead adder
c. carry-save- adderd.
d. full adder
Q. An AND circuit
a. is a memory circuit
b. gives an output when all input signals are present simultaneous ly
c. is a -ve or gate
d. is a linear circuit
Q. What are the three output conditions of a three-state buffer?
a. high, low,float
b. 1, 0, float
c. both of the above
d. neither of the above
Q. The device which changes from serial data to parallel data is
a. counter
b. multiplexe r
c. demultiple xer
d. flip-flop
Q. A device which converts BCD to Seven Segment is called
a. multiplexer
b. demultipl exer
c. encoder
d. decoder
Q. A device which converts BCD to Seven Segment is called
a. encoder
b. decoder
c. multiplexer
d. demultiple xer
Q. A multiplexer is a logic circuit that
a. accepts one input and gives several output
b. accepts many inputs and gives many output
c. accepts many inputs and gives one output
d. accepts one input and gives one output