Antenna MCQs

Question 1

Regarding Yagi-uda antenna which of the following statements is incorrect?

Accepted Answer

It has extremely high gain

Answer

It has a folded dipole as the driven element

Answer

It is often employed as VHF television receiving antenna

Answer

It is an array consisting of a driven element and parasitic elements arranged collinearly and closely

Question 2

An antenna above its critical frequency is

Accepted Answer

inductive

Answer

resistive

Answer

capacitive

Answer

any of the above

Question 3

Forantenna, the length is X14.

Accepted Answer

Marconi

Answer

Hertz

Answer

Dipole

Answer

Discone

Question 4

Microwave signals transmitted towards the sky are

Accepted Answer

transmitted through the ionosphere

Answer

unable to reach the ionosphere because of strong absorption in the lower atmosphere

Answer

strongly reflected by the ionosphere

Answer

strongly absorbed by the ionosphere

Question 5

Anomalous propagation is caused by which of the following?

Accepted Answer

Metereological factors

Answer

Troposcatter

Answer

Super-refractive duct

Answer

None of the above

Question 6

For antenna the length is X/2.

Accepted Answer

Hertz

Answer

Monopole

Answer

Discone

Answer

None of the above

Question 7

A rhombic antenna is a

Accepted Answer

non-resonant antenna

Answer

resonant antenna

Answer

either of the above

Answer

none of the above

Question 8

The bandwidth of a parabolic dish antenna

Accepted Answer

decreases with increase in the dish diameter

Answer

is independent of the dish diameter

Answer

decreases with decrease in the dish diameter

Answer

none of the above

Question 9

Fading in ship to ship communication can be reduced by using which of the following?

Accepted Answer

Frequency diversity A more directional antenna

Answer

Space diversity

Answer

A broad band antenna