Antenna MCQs

Question 1

An antenna is a device

Accepted Answer

that converts guided electomagnetic waves into free space electromagnetic waves and vice versa

Answer

that converts electromagnetic energy into an RF signal

Answer

that converts RF signal into electromagnetic energy

Answer

none of these

Question 2

The directive gain of antenna is defined as the

Accepted Answer

ratio of the radiation intensity in a given direction to that of the radiation intensity in the same direction due to a hypothetical isotropic radiator that radiates the same total power

Answer

ratio of the average radiated power to the radiated power in a given direction

Answer

ratio of the radiation intensity in a given direction due to a hypothetical isotropic radiator to the radiation intensity in the the samedirection due to the actual antenna

Answer

none of these

Question 3

Directivity of an antenna is

Accepted Answer

the maximum value of its directive gain

Answer

same as its directive gain

Answer

directive gain expressed in decibels

Answer

none of these

Question 4

An antenna having a higher 'Q' has

Accepted Answer

vertically polarised electromagnetic waves

Answer

a higher bandwidth structure of horizontally polarised electromagnetic waves

Answer

circularly polarised electromagnetic waves

Answer

none of these

Question 5

Refer to the antenna Fig. 13.1. It is

Accepted Answer

a driven array

Answer

a log-periodic antenna

Answer

a broadside parasitic array

Answer

Yagi-antenna

Question 6

an antenna placed in the horizontal plane produces

Accepted Answer

verticallypolarised electromagnetic waves

Answer

horizontally polarised electromagnetic waves

Answer

elliptically polarised electromagnetic waves

Answer

none of these

Question 7

A Yagi antenna in the horizontal plane produces

Accepted Answer

a figure eight directional pattern

Answer

an end fire directional pattern

Answer

a broadside directional pattern

Answer

none of these

Question 8

A seven element parasitic array of the Yagi type to be used as a TV receiving antenna would preferably have

Accepted Answer

one dipole, five directors and one reflector

Answer

two dipoles, three reflectors and two directors

Answer

two dipoles, four directors and one reflector

Answer

one dipole, four directors and two reflectors

Question 9

Most commonly used antenna type with TV receivers is the

Accepted Answer

yagi antenna

Answer

V-antenna

Answer

rhombic antenna

Answer

loop antenna