Electronics and Communication Engineering - Exam Questions Papers

1. 

Assertion (A): The expression E = - ΔV, where E is the electric field and V is the potential is not valid for time varying fields.

Reason (R): The curl of a gradient is identically zero.

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 B

Explanation:

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

2. 

At 20 GHz , the gain of a parabolic dish antenna of 1 meter diameter and 70% efficiency is

A. 15 dB
B. 25 dB
C. 35 dB
D. 45 dB

Answer: Option C

Explanation:

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3. 

Hysteresis loss in a transformer working at 220 V and at a frequency of 50 Hz is 100 W. When the transformer is operated at 220 V and at a frequency of 100 Hz, what is the hysteresis loss?

A. 50 W
B. 100 W
C. 200 W
D. 400 W

Answer: Option A

Explanation:

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4. 

Given the transfer function

Polar plot will be of shape.

A.
B.
C.
D.

Answer: Option A

Explanation:

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5. 

The output corresponding to the figure shown below is :

A.
B.
C.
D.

Answer: Option C

Explanation:

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