i. AM radio is a line of sight system

ii. AM broadcast band has higher frequencies than FM broadcast band
iii. FM has noise immunity advantage
iv. FM has higher fidelity

A:-Only iii and iv

B:-Only i and iv

C:-Only i and iii

D:-Only ii and iii

Correct Answer:- Option-A

Question57:-An audio signal of 5 kHz frequency is amplitude modulated with a
carrier signal of 1.6 MHz frequency. Which of the following statement is true ?

A:-The bandwidth required is 5 kHz
B:-The sideband frequencies are 1605 kHz and 1610 kHz
C:-The bandwidth required is 11 kHz
D:-The sideband frequencies are 1605 kHz and 1595 kHz
Correct Answer:- Option-D
Question58:-All the succeeding stages of a super heterodyne receiver operates on
A:-Intermediate frequency
B:-Radio frequency
C:-Low frequency
D:-High frequency
Correct Answer:- Option-A

Question59:-Which of the following is true with respect to antenna ?
i. To make it more directional, its size must be reduced.
ii. The efficiency of antenna will be 62.5% when antenna resistance is 30% and
radiation
resistance is 50%.
iii. Minimum length of the antenna required to send a signal of frequency 500 kHz is
150 m.

A:-Only i and iii
B:-Only ii
C:-Only iii
D:-Only ii and iii

Correct Answer:- Option-D

Question60:-Which of the following statements are true ?
i. Fading of signals is caused due to obstacles.
ii. Handoff is the process of transferring a mobile telephone call from one cell to
another
without dropping the call.
iii. Circle is a universally adopted shape of cell.

A:-Only i and iii