Digital Electronics MCQs

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In which counter does the maximum frequency depend on the modulus?

  • A. Synchronous
  • B. Ripple
  • C. Both synchronous and ripple
  • D. Neither synchronous nor ripple
  • Correct Answer: Option B

ECL has high switching speed because the transistors are

  • A. switching between cutoff and saturation regions
  • B. switching between cutoff and active regions
  • C. switching between active and saturation regions
  • D. none of the above
  • Correct Answer: Option B

Assertion (A): TTL is a very popular logic in SSI and MSI category. Reason (R): In Schottky TTL the power dissipation is less than in ordinary TTL.

  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R are correct but R is not correct explanation of A
  • C. A is true, R is false
  • D. A is false, R is true
  • Correct Answer: Option C

Assertion (A): ECL gate has very high speed of operation. Reason (R): Transistors in ECL do not go into saturation region.

  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R are correct but R is not correct explanation of A
  • C. A is true, R is false
  • D. A is false, R is true
  • Correct Answer: Option A

Assertion (A): Tristate logic is used for bus oriented systems Reason (R): The outputs of a tristate logic are 0, 1 and indeterminant.

  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R are correct but R is not correct explanation of A
  • C. A is true, R is false
  • D. A is false, R is true
  • Correct Answer: Option C

Which of the following are included in the architecture of computer? Addressing mode, design of CPU Instruction set, data format Secondary memory, operating system Select the correct answer using the codes given below:

  • A. 1 and 2
  • B. 2 and 3
  • C. 1 and 3
  • D. 1, 2 and 3
  • Correct Answer: Option A

An 8 bit binary number is to be entered into an 8 bit serial shift register. The number of clock pulses required is

  • A. 1
  • B. 2
  • C. 3
  • D. 8
  • Correct Answer: Option D

Parallel adder is

  • A. sequential circuit
  • B. combinational circuit
  • C. either sequential or combinational circuit
  • D. none of the above
  • Correct Answer: Option B

The number of counter states which an 8 bit stair step A/D converter has to pass through before conversion takes place is equal to

  • A. 1
  • B. 8
  • C. 255
  • D. 256
  • Correct Answer: Option D

A half adder adds

  • A. 2 bits
  • B. 3 bits
  • C. 4 bits
  • D. 2 or 3 bits
  • Correct Answer: Option A