Antenna MCQs

Question 1

Electrical length or effective length of an antenna is

Accepted Answer

greater than its physical length

Answer

same as its physical length

Answer

smaller than its physical length

Answer

none of these

Question 2

An added capacitance

Accepted Answer

decreases the effective length of the antenna

Answer

increases the effective length of the angenna

Answer

has no effect on antenna's length

Answer

none of these

Question 3

An added inductance

Accepted Answer

decreases the resonant frequency of the antenna

Answer

increases the resonant frequency of the antenna

Answer

compensates for parasitic capacitances

Answer

none of these

Question 4

An antenna to be used for a band of frequencies from 60 to 65 MHz was designed for 65 MHz. The tuning element required is

Accepted Answer

a variable inductance

Answer

a variable capacitance

Answer

a fixed capacitance

Answer

none of these

Question 5

Gain of a non-resonant V-antenna is

Accepted Answer

less than that of a non-resonant rhombic antenna

Answer

same as that of a non-resonant rhombic antenna

Answer

greater than that of a non-resonant rhombic antenna

Answer

none of these

Question 6

AV-antenna consists of

Accepted Answer

none of these

Answer

two wires with an apex angle of 45?

Answer

two (X/2) long wires with an apex angle of 45?

Answer

two (V4) long wires with an apex angle of 45?

Question 7

One of the following is an non-resonant antenni

Accepted Answer

The rhombic antenna

Answer

The folded dipole

Answer

The endfire array

Answer

The broadside array

Question 8

One of the following antenna types is best excited from a waveguide

Accepted Answer

Horn antenna

Answer

Helical antenna

Answer

Biconical antenna

Answer

Log-periodic antenna

Question 9

Top loading is used with antennas to

Accepted Answer

increase the effective height

Answer

reduce the effective height

Answer

increase the bandwidth

Answer

increase the input capacitance