Antenna MCQs

Question 1

Which of the following antennas are commonly used for microwave links?

Accepted Answer

Parabolloidal dishes

Answer

Rhombic antennas

Answer

Loop antennas

Answer

Log periodic antennas

Question 2

A log periodic antenna is a antenna.

Accepted Answer

frequency independent

Answer

directional

Answer

frequency dependent

Answer

none of the above

Question 3

can make the antenna electrically longer.

Accepted Answer

Capacitive top loading

Answer

Vertical polarization

Answer

Series capacitor

Answer

All of the above

Question 4

The bandwidth of an antenna is

Accepted Answer

inversely proportional to Q

Answer

directly proportional to Q2

Answer

directly proportional to Q

Answer

inversely proportional to 1/Q3

Question 5

With reference to ?Triatics' which of the following statements is correct?

Accepted Answer

These are the towers or masts which are not used as radiators

Answer

These are supports for antenna conductors

Answer

These are small height antennas directly mounted on jeeps, ships etc.

Answer

none of these

Question 6

An antenna coupler is used due to all of the following reasons except to

Accepted Answer

prevent reradiation of the local oscillator

Answer

discriminate against harmonics

Answer

provide the output amplifier with correct load impedance

Answer

make the antenna look resistive

Question 7

The gain of an isotropic antenna is

Accepted Answer

10 db

Answer

2 db

Answer

5 db

Answer

15 db

Question 8

antenna is the standard reference antenna for the directiveness.

Accepted Answer

Isotropic

Answer

Elementry doublet

Answer

Rhombic

Answer

Half-wave dipole

Question 9

An earthmat is used with antennas due to all the following reasons except

Accepted Answer

protection of personnel working underneath

Answer

improvement of the radiation patternof the antenna

Answer

provision of an earth for the antenna

Answer

impossibility of good ground connection