Electromagnetism MCQs

Question 1

A nonresonant antenna is

Accepted Answer

rhombic antenna

Answer

Yagi antenna

Answer

folded dipok.

Answer

log periodic antenna

Question 2

An isotropic radiator is one which short circuited impedance is to Yagi antenna is

Accepted Answer

good bandwidth

Answer

folded dipole

Answer

parasitic element

Answer

low cost

Question 3

The term which does not apply range. It is best to use

Accepted Answer

broad-band directional coupler

Answer

a balun transformer

Answer

a single stub of adjustable position

Answer

a double stub

Question 4

Antenna reciprocity is used in

Accepted Answer

radio broadcast

Answer

TV broadcast

Answer

aircraft instrumentation

Answer

multiplex tele metry

Question 5

Circularly polarized antenna is

Accepted Answer

helical

Answer

Yagi

Answer

shombic

Answer

log periodic

Question 6

In an end fire array, maximum radiation occurs

Accepted Answer

long the array

Answer

perpendicular to the array

Answer

at 30? to the array

Answer

at 45? to the array

Question 7

Marconi antenna

Accepted Answer

is an omnidiretional antenna

Answer

is a wideband antenna

Answer

has corner spacing of X/2

Answer

has driven elements only

Question 8

A square corner reflector is used in

Accepted Answer

all the above

Answer

radio astronomy

Answer

point-to-point communication

Answer

TV broadcast

Question 9

An underground ground antenna near the

Accepted Answer

acts as an antenna array.

Answer

acts a single antenna of twice the hight

Answer

acts as a reflector

Answer

must be horizontally polarized