Digital Electronics MCQs

MCQs on Digital Electronics

Solve Digital Electronics Multiple-Choice Questions to prepare better for GATE. If you wish to learn more about Digital Electronics and Digital Electronics MCQs, you can check notes, mock tests, and previous years’ question papers. Gauge the pattern of MCQs on Digital Electronics by solving the ones that we have compiled below for your practice:

Digital Electronics Multiple-Choice Questions

1. Which of these number systems has a base of 16?

a. Decimal

b. Binary

c. Hexadecimal

d. Octal

Answer: (c) Hexadecimal

2. A Silicon Controlled Rectifier (SCR) is a device with:

a. 4 junctions

b. 3 junctions

c. 2 junctions

d. 1 junction

Answer: (c) 2 junctions

3. Which of these semiconductor devices isn’t a current triggering device?

a. MOSFET

b. TRIAC

b. Thyristor

d. GTO

Answer: (a) MOSFET

4. The addition of these binary numbers 101001+ 010011 would generate:

a. 101110

b. 000111

c. 111100

d. 010100

Answer: (c) 111100

5. The subtraction of these binary numbers 101001 – 010110 would generate:

a. 010010

b. 011001

c. 100110

d. 010011

Answer: (d) 010011

6. The multiplication of these binary numbers 10100 * 01011 would generate:

a. 011100011

b. 011011100

c. 011001100

d. 011011000

Answer: (b) 011011100

7. The division of these binary numbers: 111001 ÷ 1101 would generate:

a. 1010

b. 0110

c. 0101

d. 0011

Answer: (c) 0101

8. A JK flip-flop in the toggle mode has:

a. K = 1 and J = 1

b. K = 1 and J = 0

c. K = 0 and J = 1

d. K = 0 and J = 0

Answer: (a) K = 1 and J = 1

9. The classification of IC with complexities of 30-300 equivalent gates on one chip is called as:

a. SSI

b. MSI

c. LSI

d. VLSI

Answer: (b) MSI

10. The overflow is a:

a. Hardware problem

b. User input problem

c. Input-Output problem

d. Software problem

Answer: (d) Software problem

11. _____ is a digital circuit that is capable of storing only a single bit.

a. Flip-flop

b. NOR gate

c. XOR gate

d. Register

Answer: (a) Flip-flop

12. The DeMorgan’s Law would state that:

a. (AB)’ = A + B

b. (A+B)’ = A’*B

c. (AB)’ = A’ + B

d. (AB)’ = A’ + B’

Answer: (d) (AB)’ = A’ + B’

13. A logical sum of multiple logical products is called as:

a. NAND operation

b. OR operation

c. POS

d. SOP

Answer: (d) SOP

14. Which of these devices is used in controlling the speed of a DC motor?

a. PNP transistor

b. NPN transistor

c. SCR

d. FET

Answer: (c) SCR

15. The logic gating function in DTL is performed by:

a. Diode

b. Inductor

c. Transformer

d. Transistor

Answer: (a) Diode

16. Out of these logic families, which one provides the minimum dissipation of power?

a. TTL

b. JFET

c. CMOS

d. ECL

Answer: (c) CMOS

17. The use of the Ward- Leonard system is to control the speed of ______ Motors.

a. DC

b. Induction

c. Universal

d. Three-phase AC

Answer: (a) DC

18. Whenever the PIV rating of any diode is exceeded, then the diode would:

a. behaves like a tunnel diode.

b. be destroyed.

c. behaves like a resistor.

d. behaves like a thyristor.

Answer: (b) be destroyed.

19. Which insulating layer do we use for fabricating the MOSFET?

a. Aluminium sulphate

b. Silicon Nitride

c. Silicon dioxide

d. Copper sulphate

Answer: (c) Silicon dioxide

20. Which of these is the basic building block of all the arithmetic logic units in all the digital computers?

a. Subtractors

b. Demultiplexer

c. Attenuator

d. Adders

Answer: (d) Adders

21. The radix of an octal number system is:

a. 8

b. 2

c. 16

d. 10

Answer: (a) 8

22. We would obtain a two-transistor model of SCR by bisecting the SCRs:

a. top two layers

b. diagonally

c. bottom two Layers

d. bottom two and top two layers

Answer: (d) bottom two and top two layers

23. In a rectifier circuit, the primary function of the filter is to:

a. Minimise the AC output and DC input variations.

b. Remove ripples out of the rectified output.

c. Suppress odd harmonics.

d. Maximise the AC input variations.

Answer: (b) Remove ripples out of the rectified output.

24. In the case of a 100 kHz clock frequency, we can enter 16 bits serially into a shift register in:

a. 180 micro-sec

b. 170 micro-sec

c. 160 micro-sec

d. 150 micro-sec

Answer: (c) 160 micro-sec

25. At what frequency can we apply the digital data to a gate?

a. Propagation Frequency

b. Run-time frequency

c. AC frequency

d. Operating frequency

Answer: (d) Operating frequency

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