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digital electronics MCQs

Practise focused digital electronics questions with marked answers for exam preparation and subject revision.

digital electronics Mcqs
1. NAND gates are preferred over others because these__________________?
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A. have lower fabrication area

B. consume least electronic power

C. can be used to make any gate

D. provide maximum density in a chip

2. Which type of CPLD packaging can provide maximum number of pins on the package due to small size of the pins ?
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A. BGA

B. PGA

C. QFP

D. PLCC

3. The only function of NOT gate is to__________________?
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A. Stop signal

B. Invert input signal

C. None of the above

D. Act as a universal gate

4. In which of the following base systems is 123 not a valid number ?
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A. Base 16

B. Base 10

C. Base 3

D. Base8

5. (1(10101)2 is_______________?
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A. ( 69)10

B. (37)10

C. (41 )10

D. (5)10

6. When an input signal 1 is applied to a NOT gate, the output is ______________?
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A. Either 0 & 1

B. 0

C. None of the above

D. 1

7. The universal gate is ________________?
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A. NAND gate

B. OR gate

C. AND gate

D. None of the above

8. A debouncing circuit is________________?
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A. an astable MV

B. a bistable MV

C. a latch

D. a monostable MV

9. An AND gate will function as OR if________________?
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A. all the inputs to the gates are 1

B. all the inputs are 0

C. all the inputs and outputs are complemented

D. either of the inputs is 1

10. The inverter is _________________?
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A. one of the above

B. AND gate

C. NOT gate

D. OR gate

11. A NAND gate is called a universal logic element because______________?
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A. many digital computers use NAND gates

B. it is used by everybody

C. any logic function can be realized by NAND gates alone

D. all the minization techniques are applicable for optimum NAND gate realization

12. The number 1000 would appear just immediately after__________________?
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A. FFFF (hex)

B. 1111 (binary)

C. 7777 (octal)

D. All of the above

13. In Boolean algebra, the bar sign (-) indicates__________________?
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A. NOT operation

B. AND operation

C. None of the above

D. OR operation

14. The NOR gate is OR gate followed by____________________?
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A. None of the above

B. AND gate

C. NOT gate

D. NAND gate

15. The NAND gate is AND gate followed by_________________?
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A. None of the above

B. AND gate

C. OR gate

D. NOT gate
16. Digital circuit can be made by the repeated use of________________?
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A. NOT gates

B. OR gates

C. None of the above

D. NAND gates
17. The number of Boolean functions that can be generated by n variables is equal to_________________?
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A. 2n

B. 22 n

C. 2n-1

D. 2n

18. The fan put of a 7400 NAND gate is_______________?
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A. 10TTL

B. 8TTL

C. 5TTL

D. 2TTL

19. The binary number 10101 is equivalent to decimal number_________________?
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A. 21

B. 27

C. 12

D. 19

20. Which mechanism allocates the binary value to the states in order to reduce the cost of the combinational circuits ?
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A. State Evaluation

B. State Reduction

C. State Minimization

D. State Assignment