Digital Electronics and Logic Design MCQs with answers Page - 13

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Q. Excess-3 code is known as

  • (A) weighted code
  • (B) cyclic
  • (C) self-
  • (D) algebraic

A

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

  • (A) i and ii
  • (B) ii and iii
  • (C) iii only
  • (D) ii and i

A

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Q. X – = Y + 1 means

  • (A) x = x – y + 1
  • (B) x = –x – y – 1
  • (C) x = –x + y + 1
  • (D) x= x – y – 1

A

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Q. A binary digit is called a

  • (A) bit
  • (B) byte
  • (C) number
  • (D) character

A

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Q. The ASCII code for letter A is

  • (A) 1100011
  • (B) 1111111
  • (C) 1000001
  • (D) 10011

A

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Q. Transistor is a

  • (A) current controlled current device.
  • (B) current controlled voltage device.
  • (C) voltage controlled current device.
  • (D) voltage controlled voltage device.

A

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Q. A digital logic device used as a buffer should have what input/output characteristics?

  • (A) high input impedance and high output impedance
  • (B) low input impedance and high output impedance
  • (C) low input impedance and low output impedance
  • (D) high input impedance and low output impedance

A

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Q. What is the standard TTL noise margin?

  • (A) 5.0 v
  • (B) 0.2 v
  • (C) 0.8 v
  • (D) 0.4 v

A

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Q. The range of a valid LOW input is:

  • (A) 0.0 v to 0.4 v
  • (B) 0.4 v to 0.8 v
  • (C) 0.0 v to 1.8 v
  • (D) 0.0 v to 2.8 v

A

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Q. When an IC has two rows of parallel connecting pins, the device is referred to as:

  • (A) a qfp
  • (B) a dip
  • (C) a phase splitter
  • (D) cmos

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