# 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

Explanation:

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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

Explanation:

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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)

Explanation:

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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

Explanation:

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40.

Which one of the following is a transferred electron device?

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