About Digital Electronics

Following are some of the multiple choice questions on the Digital Electronics with answers that will help the students in developing their knowledge.

Digital Electronics MCQ

1. Which of the following is Universal Gate?

  • OR gate
  • NAND gate
  • AND gate
  • NOR gate

2. An AND gate will function as OR if

  • All the inputs to the gates are “1”
  • All the inputs are ‘0’
  • Either of the inputs is “1”
  • All the inputs and outputs are complemente'

3. Most of the digital computers do not have floating point hardware because

  • Floating point hardware is costly
  • It is slower than software
  • It is not possible to perform floating point addition by hardware
  • Of no specific reason

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

  • PLCC
  • QFP
  • PGA
  • BGA

5. Which is the example of digital device from the given option ?

  • Record players
  • Microprocessors
  • Sensors
  • Thermistors

6. Which of the following is Inverter?

  • OR gate
  • NOT gate
  • AND gate
  • NAND GATE

7. The Four common and useful MSI circuits are

  • Decoder
  • Encoder
  • Demultiplexer
  • All of the above

8. The NOR gate is OR gate followed by which gate ?

  • AND gate
  • NOT gate
  • NAND gate
  • None of the mentioned

9. The only function of NOT gate is to ___________.

  • Stop signal
  • Invert input signal
  • Act as a universal gate
  • None of the above

10. Digital circuit can be made by the repeated use of ___________

  • OR gates
  • NOT gates
  • NAND gates
  • None of the above

11. "What would happen, if smaller logic modules are utilized for performing logical functions associated with FPGA? A. Propagation delay will increase B. FPGA area will increase C. Wastage of logic modules will not be prevented D. Number of interconnected paths in device will decrease"

  • A & B
  • C & D
  • A & D
  • B & C

12. The inverter is ___________

  • NOT gate
  • OR gate
  • AND gate
  • None of the above

13. What is/are the configurable functions of each and every IOBs connected around the FPGA device from the operational point of view?

  • Input operation
  • Tristate output operation
  • Bi-directional I/O pin access
  • All of the above

14. The binary number 10101 is equivalent to decimal number ___________.

  • 19
  • 12
  • 27
  • 21

15. Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is.

  • 10 CPS
  • 120 CPS
  • 12 CPS
  • None of the above

16. When an input signal 1 is applied to a NOT gate, the output is ___________.

  • 0
  • 1
  • Either 0 & 1
  • None of the above

17. Which of the following gate is a two-level logic gate

  • OR gate
  • NAND gate
  • EXCLUSIVE OR gate
  • NOT gate

18. The NOR gate is OR gate followed by ___________.

  • AND gate
  • NAND gate
  • NOT gate
  • None of the above

19. Excess-3 code is known as

  • Weighted code
  • Cyclic redundancy code
  • Self-complementing code
  • Algebraic code

20. The NAND gate is AND gate followed by ___________.

  • NOT gate
  • OR gate
  • AND gate
  • None of the above

21. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

  • TTLAS
  • CMOS
  • ECL
  • TTLLS

22. In Boolean algebra, the bar sign (-) indicates ___________.

  • OR operation
  • AND operation
  • NOT operation
  • None of the above

23. A hexadecimal odometer displays F 52 F. The next reading will be

  • F52E
  • G52F
  • F53F
  • F53O

24. The binary code of (21.125)10 is

  • 10101.001
  • 10100.001
  • 10101.010
  • 10100.111

25. NAND. gates are preferred over others because these

  • have lower fabrication area
  • can be used to make any gate
  • consume least electronic power
  • provide maximum density in a chip.

26. Which is the correct order of sequence for representing the input values in K-map?

  • (00, 01, 10, 11)
  • (00, 10, 01, 11)
  • (00, 01, 11, 10)
  • (00, 10, 11, 01)

27. The inputs of a NAND gate are connected together. The resulting circuit is ___________.

  • OR gate
  • AND gate
  • NOT gate
  • None of the above

28. Digital computers are more widely used as compared to analog computers, because they are

  • Less expensive
  • Always more accurate and faster
  • Useful over wider ranges of problem types
  • Easier to maintain

29. Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000?

  • Two’s complement only
  • Sign and magnitude and one’s complement only
  • Two’s complement and one’s complement only
  • All three representations

30. ............. Multiplexers can be constructed from smaller ones.

  • Larger
  • Small
  • Dimultiplexers
  • None of the above

31. A full adder have -

  • 2 inputs, 2 outputs
  • 2 inputs, 1 output
  • 3 inputs, 2 outputs
  • 3 inputs, 1 output

32. In Positive logic, logic gate 1 corresponds to -

  • Zero Voltage Level
  • Positive Voltage
  • Lower Voltage Level
  • Higher Voltage Level

33. An X-OR Gate Produces an output only when it's two inputs are -

  • Low
  • Different
  • Same
  • High

34. The Only Function of a Not gate is to -

  • Invert an input signal
  • Stop A signal
  • Act an universal set
  • Recomplement a signal

35. Combinations that not listed for the input variables are -

  • Borrow
  • Don't Care
  • Overflow
  • Carry

36. ASCII code is a .................... bit code.

  • 8
  • 7
  • 2
  • 1

37. Multiplexer means .....................

  • Many in to One
  • Many in to Many
  • One in to Many
  • None of the Above

38. Binary Number system has ........... symbols.

  • 8
  • 16
  • 10
  • 2

39. The Steps required for the analysis of combinational circuits are -

  • Obtain the functions of intermediate points and outputs
  • Label the inputs and outputs
  • Draw the truth table
  • All of the Above

40. There are two types of parity -

  • Odd
  • Even
  • Both 1 & 2
  • None of the above

41. ____________numbers are used in the decimal number system?

  • 0 to 9
  • 0 to 10
  • 1 to 10
  • None of the above

42. The universal gate is ___________

  • NAND gate
  • OR gate
  • AND gate
  • None of the above

43. An OR gate has 6 inputs. The number of input words in its truth table are

  • 6
  • 32
  • 64
  • 128

44. In case of OR gate, no matter what the number of inputs, a

  • 1 at any input causes the output to be at logic 1
  • 1 at any input causes the output to be at logic 0
  • 0 any input causes the output to be at logic 0
  • 0 at any input causes the output to be at logic 1.

45. A + Ā is = ?

  • 1
  • A
  • Ā

46. AND operation is equivalant to -

  • Intersection
  • Division
  • Union
  • none of the above

47. In the boolean algebra, a variable has ________ different state(s)/value(s).

  • 3
  • 1
  • 2
  • 4

48. Pick out the CORRECT statement:

  • In a positional number system, each symbol represents the same value irrespective of its position
  • The highest symbol in a position number system as a value equal to the number of symbols in the system
  • It is not always possible to find the exact binary
  • Each hexadecimal digit can be represented as a sequence of three binary symbols.

49. Storage of 1 KB means the following number of bytes

  • 1000
  • 964
  • 1024
  • 1064

50. The number 10000 would appear just immediately after

  • FFFF (hex)
  • 1111 (binary)
  • 7777 (octal)
  • All of the above

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