Antenna MCQs

Question 1

antenna is best excited from a wave guide.

Accepted Answer

Helical

Answer

Discone

Answer

Biconical

Answer

Horn

Question 2

In which of the following fields application of the microwaves is the largest?

Accepted Answer

Communication

Answer

Cooking

Answer

Research

Answer

Industrial heating

Question 3

Lene antennas used for microwaves are usually made of

Accepted Answer

polystyrene

Answer

paraboloid surfaces

Answer

dielectric media having large refreactive index

Answer

glass of low refractive index

Question 4

A duplexer is used to

Accepted Answer

connect a receiver and a transmitter to the same antenna

Answer

connect two transmitters to the same antenna

Answer

feed more than one receiver from a signal antenna

Answer

none of the above

Question 5

Which of the following is not a reason for the use of antenna coupler?

Accepted Answer

To prevent reradiation of the local oscillator

Answer

To discriminate against harmonics

Answer

To make the antenna link resistive

Answer

To provide the output amplifier with the correct load impedances

Question 6

An antenna is synonymous to which of the following ?

Accepted Answer

Transformer

Answer

Reflector

Answer

Regulator

Answer

Generator

Question 7

Waveguides are generally used above

Accepted Answer

1000 MHz

Answer

200 MHz

Answer

600 MHz

Answer

200 GHz

Question 8

Which of the following is an essential condition for antenna array to be linear?

Accepted Answer

Individual antennas of the array must be equally spaced along a straight line

Answer

Any two individual antennas of the array must not be in the same direction

Answer

Individual antennas of the array must be of equal size

Answer

None of the above

Question 9

constitute the loss resistance of an antenna.

Accepted Answer

All of the above

Answer

Loss in earth connections

Answer

(d) Dielectric loss

Answer

Leakage loss in insulation