7000+ Electromagnetic Theory Question Bank with Answers Pdf - 1

Question: 1

An electrostatic force between two point charge increases when they are

(A) Less apart and dielectric constant of the medium between them increases

(B) More apart and dielectric constant of the medium between them increases

(C) More apart and dielectric constant of the medium between them decreases

(D) Less apart and dielectric constant of the medium between them decreases

Question: 2

In a hollow rectangular waveguide, the phase velocity

(A) Will vary with frequency depending upon the frequency range

(B) Is independent of frequency

(C) Increases with increasing frequency

(D) Decreases with increasing frequency

Question: 3

Cassegrain feed is used with a parabolic reflector to

(A) Allow the feed to be placed at a convenient point

(B) Reduce the size of the main reflector

(C) Increase the gain of the system

(D) Increase the beam width of the system

Question: 4

Which of the following phenomena is most important when foodstuff is cooked in a microwave oven?

(A) Dielectric heating

(B) Radiation heating

(C) Resistive heating

(D) Induction heating

Question: 5

A continuity equation is also called as the law of conservation of

(A) Charge

(B) Power

(C) Energy

(D) Mass