Top 350+ Solved Digital Electronics MCQ Questions Answer
Q. Controlled buffers can be useful
a. to control the circuit’s output into the bus
b. in comparison of component’s output with its input
c. in increasing the output from its low input
d. all of the mentioned
Q. A logic circuit that provides a HIGH output for both inputs HIGH or both inputs LOW is
a. ex-nor gate
b. or gate
c. ex-or gate
d. nand gate
Q. What is the first thing you will need if you are going to use a macro-function?
a. a complicated design project
b. an experienced design engineer
c. good documentation
d. experience in hdl
Q. What is the major difference between half- adders and full-adders?
a. full-adders are made up of two half-adders
b. full adders can handle double-digit numbers
c. full adders have a carry input capability
d. half adders can handle only single-digit numbers
Q. The binary subtraction of 0 – 0 = ?
a. difference = 0, borrow = 0
b. difference = 1, borrow = 0
c. difference = 1, borrow = 1
d. difference = 0, borrow = 1
Q. When performing subtraction by addition in the 2’s-complement system
a. the minuend and the subtrahend are both changed to the 2’s-complement
b. the minuend is changed to 2’s- complement and the subtrahend is left in its original form
c. the minuend is left in its original form and the subtrahend is changed to its 2’s- complement
d. the minuend and subtrahend are both left in their original form
Q. What are the two types of basic adder circuits?
a. sum and carry
b. half-adder and full-adder
c. asynchronous and synchronous
d. one and two’s-complement
Q. Which of the following is correct for full adders?
a. full adders have the capability of directly adding decimal numbers
b. full adders are used to make half adders
c. full adders are limited to two inputs since there are only two binary digits
d. in a parallel full adder, the first stage may be a half adder
Q. The selector inputs to an arithmetic/logic unit (ALU) determine the
a. selection of the ic
b. arithmetic or logic function
c. data word selection
d. clock frequency to be used
Q. What are carry generate combinations?
a. if all the input are same then a carry is generated
b. if all of the output are independent of the inputs
c. if all of the input are dependent on the output
d. if all of the output are dependent on the input
Q. A D flip-flop is used in a 4-bit serial adder, why?
a. it is used to invert the input of the full adder
b. it is used to store the output of the full adder
c. it is used to store the carry output of the full adder
d. it is used to store the sum output of the full adder
Q. What is ripple carry adder?
a. the carry output of the lower order stage is connected to the carry input of the next higher order stage
b. the carry input of the lower order stage is connected to the carry output of the next higher order stage
c. the carry output of the higher order stage is connected to the carry input of the next lower order stage
d. the carry input of the higher order stage is connected to the carry output of the lower order stage