Communication System Test

Result

Communication System Test - 16

Score
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out of -
Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

The critical frequency of player is 50 MH_z when angle of incidence is 74^o What is the maximum unable frequency ?

A

B

C

D
Question 2
4 / -1

A
1.2

B
1.44

C
0.69

D
1.6
Question 3
4 / -1

How long will it take to transmit the information 30km away in space ?

A
0.1 m s

B
0.1 µ s

C
0.1 n s

D
0.1 p s
Question 4
4 / -1

What is the velocity of electromagnetic wave in a good conductor ?

A

B

C
High

D
Very low
Question 5
4 / -1

If 'fm' is the modulation frequency in Fm the modulation index is proportional to

A
fm

B

C

D
Question 6
4 / -1

For 100% modulation, What is the value of minimum amplitude ( E_min ) of the modulated wave ?

A
Zero

B
1

C
2

D
3
Question 7
4 / -1

When electromagnetic waves enter the ionised layer of ionosphere, the relative permitting of the ionised layer

A
Remain constant

B
Appears to decrease

C
Appears to increase

D
Changer randomly
Question 8
4 / -1

In which of the following media the wave propagation occurs with out attenuation ?

A
Conductor

B
Perfect dielectric medium

C
Semi conductor

D
None of the above
Question 9
4 / -1

The step index fibre has a relative refractive index difference of 0.86% what is the critical angle at the core cladding interface ?

A
28.4^o

B
82.4^o

C
24.8^o

D
75.6^o
Question 10
4 / -1

A silicon optical fibre has a core refractive index of 1.50 and a cladding refractive index 1.47 what is the numerical aperture of the fibre ?

A
0.90

B
0.60

C
0.45

D
0.30