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Mini Mock on Electromagnetics & Electrical Materials: ESE 2018

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Question 1

The ratio is
1. Intrinsic ratio
2. Loss tangent
3. Conductin ratio
4. Dissipation factor
Which of these are correct?

Question 2

Assertion (A): For time varying field the relation is inadequate.
Reason (R): Faraday’s law, states that for time varying field .

Question 3

A transmission line having a characteristic impedance of 50 Ω is terminated at one end by j50 Ω. The voltage standing wave ratio produced will be

Question 4

A lossless transmission line of characteristic impedance Z0 and length is terminated at the load end by an open circuit. What is its input impedance ZS?

Question 5

A 5 A current enters a right circular cylinder of 5cm radius. What is the linear surface current density at the end surface?

Question 6

In a charge-free space, the poisson’s equation result in which one of the following?

Question 7

What is the expression for capacitance of an infinitely conducting solid sphere of radius ‘R’ in free space?

Question 8

Susceptibility of a diamagnetic material is
1) Negative
2) Positive
3) Dependent on the temperature
4) Independent of the temperature
Select the correct answer using the codes given below:

Question 9

An atom in a crystal vibrates at a frequency, determined by
1) Crystal heat current
2) Crystal temperature
3) The stiffness of the bonds with neighbour atoms
Select the correct answer using the codes given below:

Question 10

In hexagonal ferrites, M(Fe12O19), M usually consist of:

Question 11

A semiconductor differs from a conductor in that it has

Question 12

Permanent magnet loses the magnetic behavior when heated because of
1) atomic vibration
2) dipole vibration
3) realignment of dipoles
Which of the above are correct?
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