JEE Questions for Physics Communication System Quiz 5

A transmitting antenna at the top of a tower has a height of 50m and the height of the receiving antenna is 32m. The maximum distance between them for satisfactory communication in line of right mode is___________ Given radius of earth R = 6400 km

0%
0%
2)
0%
45.5 km
0%
None of these

The characteristic impedance of a co-axial cable is between ______________

0%
10 Ω to 20 Ω
0%
20 Ω to 30 Ω
0%
30 Ω to 60 Ω
0%
50 Ω to 70 Ω

The relation between the maximum electron denisity N max and the critical frequency f for the ionosphere can be given as

0%
0%
2)
0%
0%
None of these

In order to cover a circular region of radios 128 km, by a TV transmitter, What must be the height of the transmitting antenna ?

0%
79 m
0%
1050 m
0%
1280 m
0%
1560 m

The frequency of carries wave emitted from L - C oscillator of 10 H inductance and 1 nF capacitor is ___________

0%
1592 KHz
0%
1592 Hz
0%
1592 MHz
0%
159.2 Hz

0%
0%
2)
0%
0%

A transmitter transmit a power of 10 kw when modulation is 50%. What is the power of carrier wave ?

0%
12 KW
0%
7.0 KW
0%
8.89 KW
0%
5.0 KW

A T.V. tower has a height 200 m. By how much the height of tower be increased to triple its coverage range ?

0%
1600 m
0%
800 m
0%
1800 m
0%
600 m

0%
2 MHz
0%
10 MHz
0%
12 MHz
0%
18 MHz

What is the frequency range of signals that can be transmitted in care of twisted pair of wires ?

0%
5 MHz to 20 MHz
0%
5 MHz to 10 MHz
0%
100 Hz to 4 MHz
0%
5 MHz to 20 MHz

What type of medium is used in optical communication ?

0%
Guided medium
0%
Unguided medium
0%
Both guided and unguided media
0%
Neither guided nor unguided media

0%
9 MHz
0%
6 MHz
0%
3 MHz
0%
3 GHz

Which condition is to be satisfied in an AM detector circuit so that the signal corresponds to an en.... of the carrier wave ?

0%
0%
2)
0%
0%

The transmission of audio signal in radio broadcasting is ____________ type

0%
ASK
0%
FSK
0%
AM
0%
FM

Transmission loss per km in the optical fibre, used presently is,

0%
20 dB
0%
2 dB
0%
0.2 dB
0%
0.02 dB

In satellite communication 6 GHz frequency is used for ___________ and 4 GHz frequency is used for

0%
Uplink, down link
0%
Down link, up link
0%
Modulation, demodulation
0%
Demodulation, modulation

Assertion : Microwave communication is preferred over optical communication.
Reason : Microwaves provide large number of channels and bandwidth an compared to optical signals
(A) Both assertion and reason are true and the reason is correct explanation of assertion
(B) Both assertion and reason are true and the reason is not the correct explanation of assertion.
(C) Assertion is true but reason is false.
(D) Both assertion and reason are false

0%
A
0%
B
0%
C
0%
D

If a radio receiver amphifier all the signal frequencies equally well, it is said to have high

0%
Fidality
0%
Distortion
0%
Sensibility
0%
Sensitivity

In frequency modulation

0%
The amplitude of modulated wave varies as frequency of carrier wave
0%
The frequency of modulated wave varies as amplitude of modulating wave
0%
The amplitude of modulated wave varies as amplitude of carrier wave
0%
The frequency of modulated wave varies as frequency of modulating wave

A silicon optical fibre with a care diameter large enough has a care refractive index of 1.50 and cladding refractive index 1.47. The critical angle at the care cladding interface is ___________

0%
0%
2)
0%
0%

In satellite communication
(The frequency used lies between 5 MHz and 1 MHz
(The uplink and downlink frequencies are different
(The orbit of geostationary satellite lies in the equatorial plane at an indication of 0^o
In the above statements.