Electronics MCQ Questions and Answers

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Q31
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
  • A TTLAS
  • B CMOS
  • C ECL
  • D TTLLS
Answer: Option C
Q32
An AND gate will function as OR if
  • A all the inputs to the gates are “1”
  • B all the inputs are ‘0’
  • C either of the inputs is “1”
  • D all the inputs and outputs are complemented.
Answer: Option D
Q33
An OR gate has 6 inputs. The number of input words in its truth table are
  • A 6
  • B 32
  • C 64
  • D 128
Answer: Option C
Q34
A debouncing circuit is
  • A an astable MV
  • B a bistable MV
  • C a latch
  • D a monostable MV.
Answer: Option C
Q35
NAND. gates are preferred over others because these
  • A have lower fabrication area
  • B can be used to make any gate
  • C consume least electronic power
  • D provide maximum density in a chip.
Answer: Option B
Q36
In case of OR gate, no matter what the number of inputs, a
  • A 1 at any input causes the output to be at logic 1
  • B 1 at any input causes the output to be at logic 0
  • C 0 any input causes the output to be at logic 0
  • D 0 at any input causes the output to be at logic 1.
Answer: Option A
Q37
The fan put of a 7400 NAND gate is
  • A 2TTL
  • B 5TTL
  • C 8TTL
  • D 10TTL
Answer: Option D
Q38
Excess-3 code is known as
  • A Weighted code
  • B Cyclic redundancy code
  • C Self-complementing code
  • D Algebraic code.
Answer: Option C
Q39
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
  • A 10 CPS
  • B 120 CPS
  • C 12CPS
  • D None of the above.
Answer: Option C
Q40
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 III
Answer: Option D

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