Communication System Test

Result

Communication System Test - 18

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Weekly Quiz Competition

Question 1
4 / -1

A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the corecladding interface?

A
60°

B
75°

C
45°

D
None of these
Question 2
4 / -1

If µ₁ and µ₂ are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimised by having

A
µ₁ > µ₂

B
µ₁ < µ₂

C
µ₁ = µ₂

D
None of these

Solution
Question 3
4 / -1

For television broadcasting, the frequency employed is normally

A
30-300 MHz

B
30-300 GHz

C
30-300 kHz

D
30-300 Hz
Question 4
4 / -1

The radio waves of frequency 300 MHz to 3000 MHz belong to

A
High Frequency band

B
Very high frequency band

C
Ultra high frequency band

D
Super high frequency band
Question 5
4 / -1

An antenna behaves as resonant circuit only when its length is

A

B

C

D
Question 6
4 / -1

Laser beams are used to measure long distances because

A
They are monochromatic

B
They are highly polarised

C
They are coherent

D
They have high degree of parallelism
Question 7
4 / -1

An oscillator is producing FM waves of frequency 2 KHz with a variation of 10 KHz. What is the modulating index ?

A
0.20

B
5.0

C
0.67

D
1.5

Solution
Question 8
4 / -1

The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is

A
10%

B
20%

C
25%

D
50%

Solution
Question 9
4 / -1

Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V is amplitude modulated by sinusoidal voltage of frequency 10 kHz producing 50% modulation. The lower and upper side-band frequencies in kHz are

A
1490, 1510

B
1510, 1490

C

D

Solution
Question 10
4 / -1

What is the modulation index of an over modulated wave?

A
1

B
Zero

C
< 1

D
> 1

Solution