Question:

Circular polarization

A.

is useful in reducing depolarization effect on received wave

B.

involves critical alignment of transmitting and receiving antenna

C.

is useful in discrimination between reception of adjacent beams

D.

none of the above

Answer» a. is useful in reducing depolarization effect on received wave

Question:

Which of the following is an indirect way of generating FM?

A.

armstrong modulator

B.

varactor diode modulator

C.

reactance fet modulator

D.

reactance bipolar transistor

Answer» a. armstrong modulator

Question:

An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

A.

102.3

B.

113

C.

70.2

D.

80.9

Answer» b. 113

Question:

When the length of antenna is a whole wavelength

A.

the radiation at right angles is zero

B.

the radiation at right angles is maximum

C.

the radiation is zero in all directions

D.

the radiation is maximum in all directions

Answer» a. the radiation at right angles is zero