Practice 1000 Digital Circuits Multiple Choice Questions with Answers Quiz-1

Q.1.

When does a negative level triggered flip-flop in Digital Electronics changes its state?

a) When the clock is negative
b) When the clock is positive
c) When the inputs are all zero
d) When the inputs are all one

Q.2.

Which of the following options represent the synchronous control inputs in an S – R flip flop?

a) S
b) R
c) Clock
d) Both S and R

Q.3.

What must be used along with synchronous control inputs to trigger a change in the flip flop?

a) 0
b) 1
c) Clock
d) Previous output

Q.4.

Which of the following majorly determines the number of emitters in a TTL digital circuit?

a) Fan – in
b) Fan – out
c) Propagation delay
d) Noise immunity

Q.5.

What will be the output from a D flip – flop if the clock is low and D = 0?

a) 0
b) 1
c) No change
d) Toggle between 0 and 1

Q.6.

What are the basic gates in MOS logic family?

a) NAND and NOR
b) AND and OR
c) NAND and OR
d) AND and NOR

Q.7.

How must the output of a gate in a TTL digital circuit act when it is HIGH?

a) Acts as a voltage source
b) Acts as a current sink
c) Acts as a current source
d) Acts as a voltage sink

Q.8.

What will be the output from a D flip-flop if D = 1 and the clock is low?

a) No change
b) Toggle between 0 and 1
c) 0
d) 1

Q.9.

What is the minimum distance required for single error detection according to Hamming’s analysis in Digital Electronics?

a) 1
b) 2
c) 3
d) 4

Q.10.

Which of these error-detecting codes enables to find double errors in Digital Electronic devices?

a) Parity method
b) Check sum method
c) Bit generation method
d) Odd-Even method

Q.11.

What is Digital Electronics?

a) Field of electronics involving the study of digital signal
b) Engineering of devices that digital signal
c) Engineering of devices that produce digital signal
d) All pf the mentioned

Q.12.

Which of the following is correct for Digital Circuits?

a) Less susceptible to noise or degradation in quality
b) Use transistors to create logic gates to perform Boolean logic
c) Easier to perform error detection and correction with digital signal
d) All of the mentioned

Q.13.

What is a Circuit?

a) Open-loop through which electrons can pass
b) Closed-loop through which electrons can pass
c) Closed-loop through which Neutrons can pass
d) None of the mentioned

Explanation

Q.14.

Which of the following is an example of a digital Electronic?

a) Computers
b) Information appliances
c) Digital cameras
d) All of the mentioned

Q.15.

Which of the following is a type of digital logic circuit?

a) Combinational logic circuits
b) Sequential logic circuits
c) Both a & b
d) None of the mentioned

Q.16.

Which of the following options comes under the non – saturated logic family in Digital Electronics?

a) Emitter – coupled Logic
b) High-Threshold Logic
c) Integrated – injection Logic
d) Diode – Transistor Logic

Q.17.

What is a switching function that has more than one output called in Digital Electronics?

a) Multi-gate function
b) Multi-output function
c) Multiple-gate function
d) Multiple-output function

Q.18.

Which characteristic of IC in Digital Circuits represents a function of the switching time of a particular transistor?

a) Fan – out
b) Fan – in
c) Power dissipation
d) Propagation delay

Q.19.

When can one logic gate drive many other logic gates in Digital Electronics?

a) When its output impedance is low and the input impedance is low
b) When its output impedance is high and the input impedance is high
c) When its output impedance is high and the input impedance is low
d) When its output impedance is low and the input impedance is high

Q.20.

Which of the following digital logic circuits can be used to add more than 1 – bit simultaneously?

a) Full – adder
b) Ripple – carry adder
c) Half – adder
d) Serial adder

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