Antenna MCQs

Question 1

A helical antenna is used for satellite tracking because of its

Accepted Answer

circular polarization

Answer

large bandwidth

Answer

large gain

Answer

maneuverability

Question 2

The antenna of Fig. 13.2(a) produces

Accepted Answer

vertically polarised waves

Answer

horizontal polarised waves

Answer

circularly polarised waves

Answer

none of these

Question 3

Fig. 13.3 shows the power densit radiation pattern of a certain antenna. The beamwidth of the antenna is

Accepted Answer

a flat response

Answer

an upper bandwidth

Answer

a lower bandwidth

Answer

none of these

Question 4

A non-resonant antenna is characterized bY

Accepted Answer

(a), (b) and (c)

Answer

antenna being terminated in a resistance

Answer

the presence of only the forward travelling wave and absence of standing waves

Answer

a unidirectional radiation pattern

Question 5

A resonant antenna is characterised by

Accepted Answer

(a) and (c)

Answer

the presence of standing waves

Answer

a unidirectional, highly directional radiation pattern

Answer

a bidirectional radiation pattern

Question 6

One of the following antennas can be used for direction finding

Accepted Answer

Loop antenna

Answer

Half wave dipole

Answer

Broadside antenna array

Answer

End fire antenna array

Question 7

Microwave antennas have

Accepted Answer

low input impedance

Answer

high gain

Answer

high front to back ratio

Answer

high input impedance

Question 8

An antenna that radiates 5 kW in its optimum direction and 50 watts in the opposite direction has a front to back ratio of

Accepted Answer

20 dB

Answer

40 dB

Answer

10 dB

Answer

none of these

Question 9

A resonant antenna is a system with

Accepted Answer

a very high SWR

Answer

zero SWR

Answer

a very low SWR

Answer

none of these