Antenna MCQs

Question 1

Most of the man made noise has

Accepted Answer

vertical polarization

Answer

circular polarization

Answer

horizontal polarization

Answer

elliptic polarisation

Question 2

That portion of a plane near the antenna, Perpendicular to the direction of radiation, through which major part of radiation passes is called

Accepted Answer

antenna aperature

Answer

near field region

Answer

effective antenna diameter

Answer

effective radiating area

Question 3

The region of the field of antenna where the angular field distribution is essentially independent of radial distance from the antenna is called the

Accepted Answer

far field region

Answer

near field region

Answer

induction field region

Answer

crossover region

Question 4

According to Siegel and Labus, antenna can be treated as

Accepted Answer

opened-out transmission line

Answer

closed transmission line

Answer

shorted transmission line

Answer

earthed transmission line

Question 5

A radio antenna 1 cm diameter conductor is stretched horizontally 10 meres above the ground. The capacitance of antenna per unit length neglecting end effects will be nearly

Accepted Answer

6.7 pF

Answer

0.67 pF

Answer

6.7 RF

Answer

67 tF

Question 6

The directive gain of an antenna is given by

Accepted Answer

(b) 40?

Answer

20?

Answer

(c) 60?

Answer

30?

Question 7

In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Accepted Answer

front to back ratio

Answer

transmission efficiency

Answer

loss coefficieny

Answer

none of the above

Question 8

Front to back ratio can be increased by

Accepted Answer

sacrificing gain

Answer

increasing size of conductor

Answer

using materials of high conductivity

Answer

all of the above

Question 9

The maximum effective aperture of a short dipole is nearly

Accepted Answer

0.119 X2

Answer

0.00119 X.2

Answer

0.0119 X2

Answer

1.19 X2