# Procedure For The Design of Combinational Circuits MCQ’s

This set of Digital Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Procedure For The Design of Combinational Circuits”.

1. A digital system consists of _____ types of circuits.
a) 2
b) 3
c) 4
d) 5

2. In a combinational circuit, the output at any time depends only on the _______ at that time.
a) Voltage
b) Intermediate values
c) Input values
d) Clock pulses

3. The basic building blocks of the arithmetic unit in a digital computers are ____________
a) Subtractors
c) Multiplexer
d) Comparator

4. In a sequential circuit, the output at any time depends only on the input values at that time.
a) Past output values
b) Intermediate values
c) Both past output and present input
d) Present input values

5. All logic operations can be obtained by means of ____________
a) AND and NAND operations
b) OR and NOR operations
c) OR and NOT operations
d) NAND and NOR operations

6. If the two numbers are unsigned, the bit conditions of interest are the ______ carry and a possible _____ result.
a) Input, zero
b) Output, one
c) Input, one
d) Output, zero

7. Procedure for the design of combinational circuits are:

```A. From the word description of the problem, identify the inputs and outputs and draw a block diagram.
B. Draw the truth table such that it completely describes the operation of the circuit for different
combinations of inputs.
C. Simplify the switching expression(s) for the output(s).
D. Implement the simplified expression using logic gates.
E. Write down the switching expression(s) for the output(s).```

a) B, C, D, E, A
b) A, D, E, B, C
c) A, B, E, C, D
d) B, A, E, C, D

8. The design of an ALU is based on ____________
a) Sequential logic
b) Combinational logic
c) Multiplexing
d) De-Multiplexing

9. If the two numbers include a sign bit in the highest order position, the bit conditions of interest are the sign of the result, a zero indication and ___________
a) An underflow condition
b) A neutral condition
c) An overflow condition
d) One indication

10. The flag bits in an ALU is defined as ____________
a) The total number of registers
b) The status bit conditions
c) The total number of control lines
d) All of the Mentioned