Electronics and Communication Engineering - Exam Questions Papers

36. 

Which of the following is/are correct statement(s)?

  1. Bus is a group of wires carrying information.
  2. Bus is needed to achieve reasonable speed of operation.
  3. Bus can carry data or address.
  4. A bus can be shared by more than one device.
Select the correct answer from the codes given below

A. 1 only
B. 1 and 2 only
C. 2, 3 and 4 only
D. 1, 2, 3 and 4

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

37. 

Assertion (A): A fixed bias BJT circuit exhibits better performance as compared to a self bias BJT circuit.

Reason (R): A fixed bias BJT circuit used less components as compared to a self bias BJT circuit.

A. Both A and R are individually true and R is the correct explanation of A
B. Both A and R are individually true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

38. 

A linear time-invariant, causal continuous time system has a rational transfer function with simple poles at s = - 2 and s = - 4, and one simple zero at s = - 1. A unit step u(t) is applied at the input of the system. At steady state, the output has constant value of 1. The impulse response of this system is

A. [exp (- 2t) + exp (-4t)] u(t)
B. [-4 exp (- 2t) + 12 exp (-4t) - exp (-t)] u(t)
C. [-4 exp (- 2t) + 12 exp (-4t)] u(t)
D. [-0.5 exp (- 2t) + 1.5 exp (-4t)] u(t)

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

39. 

The signal cos ωct + 0.5 cos ωmt sin ωct is

A. FM only
B. AM only
C. both AM & FM
D. neither AM nor FM

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

40. 

Which one of the following is a transferred electron device?

A. BARITT diode
B. IMPATT diode
C. TRAPATT diode
D. Gunn diode

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.