Question 1

In a TV receiver antenna the length of reflector rod.
A)is the same as that of dipole
B)is less than that of dipole
C)is more than that of dipole
D)may be equal, more or less than that of dipole

Accepted Answer

In a TV receiver antenna, the length of the reflector rod is more than that of the dipole. This is because the reflector helps in directing more signal towards the dipole, enhancing the antenna's ability to receive signals. The increased length of the reflector compared to the dipole is a design choice to improve the directivity and gain of the antenna.

Question 2

The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?
A)gets halved
B)gets doubled
C)gets increased by 50 percent
D)remains unchanged

Accepted Answer

C

Question 3

For AM receivers the standard IF frequency is
A)106 khz
B)455 khz
C)1.07 mhz
D)10.7 mhz

Accepted Answer

The standard Intermediate Frequency (IF) for AM receivers is 455 kHz. This frequency is chosen for its balance between selectivity and sensitivity in the receiver design.

Question 4

For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
A)2e
B)3e
C)4e
D)6e

Accepted Answer

In a plate-modulated class C amplifier, the maximum plate-cathode voltage can reach up to approximately 4 times the plate supply voltage (E) due to the modulation process.

Question 5

In TV systems, equalising pulses are sent during
A)horizontal blanking
B)vertical blanking
C)serrations
D)horizontal retrace

Accepted Answer

The answer of In TV systems, equalising pulses are sent...

Question 6

A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is
A)16
B)15
C)8
D)1

Accepted Answer

The answer of A three stage telephone switching structure is...

Question 7

The main function of a balanced modulator is to
A)produce balanced modulation of a carrier wave
B)produce 100% modulation
C)suppress carrier signal in order to create a single-sideband or double sideband
D)limit noise picked by a receiver

Accepted Answer

The answer of The main function of a balanced modulator...

Quiz 4: Electronics and Telecommunications

In a TV receiver antenna the length of reflector rod.

The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?

For AM receivers the standard IF frequency is

For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as

In TV systems, equalising pulses are sent during

A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

The main function of a balanced modulator is to