Digital Electronics

11. Excess-3 code is known as

  1. Weighted code
  2. Cyclic redundancy code
  3. Self-complementing code
  4. Algebraic code.

Correct answer: (C)
Self-complementing code

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

  1. 1 at any input causes the output to be at logic 1
  2. 1 at any input causes the output to be at logic 0
  3. 0 any input causes the output to be at logic 0
  4. 0 at any input causes the output to be at logic 1.

Correct answer: (A)
1 at any input causes the output to be at logic 1

13. In which of the following base systems is 123 not a valid number?

  1. Base 10
  2. Base 16
  3. Base8
  4. Base 3

Correct answer: (D)
Base 3

14. Indicate which of the following three binary additions are correct?
1.1011 + 1010 = 10101
II. 1010 + 1101 = 10111
III. 1010 + 1101 = 11111

  1. I and II
  2. II and III
  3. III only
  4. II and III

Correct answer: (D)
II and III

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

  1. floating point hardware is costly
  2. it is slower than software
  3. it is not possible to perform floating point addition by hardware
  4. of no specific reason.

Correct answer: (A)
floating point hardware is costly

16. NAND. gates are preferred over others because these

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

Correct answer: (B)
can be used to make any gate

17. Pick out the CORRECT statement:

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

Correct answer: (C)
It is not always possible to find the exact binary

18. Positive logic in a logic circuit is one in which

  1. logic 0 and 1 are represented by 0 and positive voltage respectively
  2. logic 0 and, -1 are represented by negative and positive voltages respectively
  3. logic 0 voltage level is higher than logic 1 voltage level
  4. logic 0 voltage level is lower than logic 1 voltage level.

Correct answer: (D)
logic 0 voltage level is lower than logic 1 voltage level.

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

  1. 1000
  2. 964
  3. 1024
  4. 1064

Correct answer: (C)
1024

20. The binary code of (21.125)10 is

  1. 10101.001
  2. 10100.001
  3. 10101.01
  4. 10100.111.

Correct answer: (A)
10101.001

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