Communication System Test

Result

Communication System Test - 35

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Weekly Quiz Competition

Question 1
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 2
4 / -1

Sinusoidal carrier voltage of amplitude 50 V is amplitude voltage of frequency 10 modulation. The lower frequencies in kHz are

A
1490, 1510

B
1510, 1490

C

D

Solution
Question 3
4 / -1

What is the modulation index of an over modulated wave

A
1

B
Zero

C
< 1

D
> 1

Solution
Question 4
4 / -1

Basically, the product modulator is

A
An amplifier

B
A mixer

C
A frequency separator

D
A phase separator
Question 5
4 / -1

If f_a and f_f represent the carrier wave frequencies for amplitude and frequency modulations respectively, then

A
f_a>f_f

B
f_af

C
f_a =f_f

D
f_a ≥f_f
Question 6
4 / -1

Which of the following is the disadvantage of FM over AM

A
Larger band width requirement

B
Larger noise

C
Higher modulation power

D
Low efficiency
Question 7
4 / -1

If a number of sine waves with modulation indices n₁, n₂, n₃ ....modulate a carrier wave, then total modulation index (n) of the wave is

A
n₁ + n₂... + 2 (n₁ + n₂ ...)

B

C

D
None of the above
Question 8
4 / -1

An AM wave has 1800 watt of total power content. For 100% modulation the carrier should have power content equal to

A
1000 watt

B
1200 watt

C
1500 watt

D
1600 watt

Solution
Question 9
4 / -1

What type of modulation is employed in India for radio transmission

A
Amplitude modulation

B
Frequency modulation

C
Pulse modulation

D
None of the above
Question 10
4 / -1

When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant, the modulation system is

A
Amplitude modulation

B
Phase modulation

C
Frequency modulation

D
All of these