Digital Circuits MCQ For Supervisor and Operator

 

Digital Circuits MCQ For Supervisor and Operator

All Questions are important , so read it carefully. Others question Suggestions  Coming soon....

 

 1. How many bits are needed to store one BCD digit?

1. 2 bits
2. 4 bits
3. 3 bits
4. 1 bit 

2. Which of these sets of logic gates are known as universal gates?

1. XOR, NAND, OR
2. OR, NOT, XOR
3. NOR, NAND, XNOR  
4. NOR, NAND 

3. The inverter can be classified as

1. Power Inverter
2. Voltage source Inverter
3. Current source Inverter
4. Both option b and c

4. Temperature variation is a/an

1. Analog quantity
2. Digital quantity
3. Either Analog or Digital quantity
4. None of these

5. An overflow is a

1. User input problem
2. Hardware problem
3. Software problem
4. Input-Output problem

6.  A digital circuit that can store only one bit is a

1. Register
2. NOR gate
3. Flip-flop
4. XOR gate

7. In DTL, the logic gating function is performed by

1. Inductor
2. Diode
3. Transistor
4. Transformer

 8. Which of the given logic family provide minimum power dissipation

1. JFET
2. ECL
3. CMOS
4. TTL

 9. The AND operation is equivalent to

1. Union
2. Intersection
3. Division
4. Both option a and b

10. TTL is a class of digital circuits built from

1. Resistors only
2. BJT (Bipolar Junction Transistors) only
3. JEFT only
4. Both option a and b

11.  Which logic unit is the fastest of all the logic families?

1. DTL
2. TTL
3. ECL(ECL stands for Emitter Coupled Logic. It is the fastest of all the logic families because of its higher transmission rate)
4. CMOS

12.  Which insulating layer is used in the fabrication of MOSFET?

1. Silicon Nitride
2. Aluminum sulphate
3. Copper sulphate
4. Silicon dioxide

13.  CMOS technology used in?

1. Microprocessor
2. Inverter
3. Digital logic
4. Both option a and c

14.  How much input and output needed for demultiplexer?

1. Many outputs to one input
2. One input many outputs
3. One input one output
4. None of these

15.  A register can be defined as

1. The group of transistors for storing n- a bit of information
2. The group of transistors for storing two bits of information
3. The group of flip-flops for storing n bit of information
4. The group of flip-flops for storing binary information.

16.  At which frequency the digital data can be applied to a gate?

1. Run-time frequency
2. Propagation Frequency
3. Operating frequency
4. AC frequency

17. A device which converts BCD to seven segments is called ……..

1. Encoder
2. Decoder
3. Multiplexer
4. None of these

18. A decade counter skips ………..

1. binary states 1000 to 1111
2. binary states 0000 to 0011
3. binary states 1010 to 1111
4. binary states 1111 to higher

Explanation:  A decade counter counts from 0 to 9. It has 4 flip-flops. The states skipped are 10 to 15 or 1010 to 1111.

19. Which of the following is non-saturating?

1. TTL
2. CMOS
3. ECL
4. Both 1 and 2

 20. The basic storage element in a digital system is ………….

1. flipflop
2. counter
3. multiplexer
4. encoder

21. Which device has one input and many outputs?

1. Multiplexer
2. Demultiplexer
3. Counter
4. Flip flop

22. How many entries will be in the truth table of a 3 input NAND gate ?

1.  3
2.  6
3. 8

 9

23.Which of the following is a digital device

1.  Regulator of a fan
2.  Microphone
3.  Resistance of a material
4.  Light switch

24. In Digital Logic Designs, GAL is abbreviated as

1.  General Advance Logic
2.  General Array Logic
3.  Generic Advance Logic
4.  Generic Array Logic 

25.  Stack is also known as

1. FIFO memory
2. Flash memory
3. LIFO memory
4. LILO memory

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