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Worksheets

MCQ

Total questions: 70

Worksheet time: 46mins

Name
Class
Date
1.

In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with the amplitude and frequency variations of the modulating signal.

a)

a) True

b)

b) False

2.

What is the line connecting the positive and negative peaks of the carrier waveform called?

a)

a) Peak line

b)

b) Maximum amplitude ceiling

c)

c) Modulation index

d)

d) Envelope

3.

What is the reference line for the modulating signal?

a)

a) Zero line

b)

b) Carrier peak line

c)

c) Modulated peak line

d)

d) Un-modulated peak line

4.

What happens when the amplitude of the modulating signal is greater than the amplitude of the carrier?

a)

a) Decay

b)

b) Distortion

c)

c) Amplification

d)

d) Attenuation

5.

What is the effect of distortion?

a)

a) Total information loss

b)

b) Error information

c)

c) Attenuated information

d)

d) Amplified information

6.

What is the circuit used for producing AM called?

a)

a) Modulator

b)

b) Transmitter

c)

c) Receiver

d)

d) Duplexer

7.

The ratio between the modulating signal voltage and the carrier voltage is called?

a)

a) Amplitude modulation

b)

b) Modulation frequency

c)

c) Modulation index

d)

d) Ratio of modulation

8.

What is the modulation index value if Vmax=5.9v and Vmin=1.2v?

a)

a) 0.5

b)

b) 0.662

c)

c) 0.425

d)

d) 0.14

9.

What is the modulating signal voltage if the maximum and the minimum voltages on the wave was observed to be 5.9v and 1.2v respectively?

a)

a) 2.35v

b)

b) 2.12v

c)

c) 1.85v

d)

d) 3.21v

10.

What is the condition for greatest output power at the transmitter without distortion?

a)

a) Modulating signal voltage > Carrier voltage

b)

b) Modulating signal voltage < Carrier voltage

c)

c) Modulating signal voltage = Carrier voltage

d)

d) Modulating signal voltage = 0

11.

The process of changing a property of a wave to transmit information is called

a)

Moderation

b)

Modulation

c)

Attenuation

d)

Induction

12.

Which terms describe the purpose of antennas on devices that use radio waves?

a)

transmit and receive

b)

transport and resale

c)

trancend and return

d)

tranquilize and receive

13.

The primary job of a(n) on a receiver is to capture modified radio waves

a)

antilope

b)

antenna

c)

wire

d)

cable

14.

How are amplitude modulation and frequency modulation techniques similar?

a)

Both are used by radio stations to transmit sound.

b)

Both are used by MTV

c)

They modulate frequency

d)

They modulate amplitude

15.

Transmitted power in FM system is

a)

always constant

b)

dependent on the number of sidebands

c)

dependent on the total bandwidth

d)

all of above

16.

In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with the amplitude and frequency variations of the modulating signal.

a)

a) True

b)

b) False

17.

What is the maximum frequency deviation allowed in commercial FM broadcasting?

a)

100 KHz

b)

75 KHz

c)

150 KHz

d)

20 KHz

18.

In Frequency Modulation –

a)

Amplitude of the carrier remains same

b)

Frequency of the carrier varies in accordance with the modulating signal

c)

The number of side bands are infinite

d)

Amplitude of the carrier varies in accordance with the modulating signal

19.

A 100 MHz carrier is deviated 50 kHz by a 4 kHz signal. The modulation index is _______.

a)

5

b)

8

c)

12.5

d)

20

20.
Which wave has a greater frequency?
a)
A
b)
B
21.

In Single tone amplitude modulation message signal contains ________

a)

consists of only one frequency component

b)

contains a large number of frequency components

c)

contains no frequency components

d)

contains infinite number of frequency components

22.

AM spectrum consists of ________

a)

Carrier frequency

b)

Upper sideband

c)

Lower sideband

d)

Carrier frequency with both upper and lower sideband

23.

Amplitude Modulated wave is ________

a)

Sum of carrier and modulating wave

b)

Product of carrier and modulating wave

c)

Difference of carrier and modulating wave

d)

Sum of carrier and its product with modulating wave

24.

AM waves is represented by which equation?

a)

[1 + m(t)].c(t)

b)

[1 – m(t)].c(t)

c)

[1 + m(t)].2c(t)

d)

[1 + 2m(t)].c(t)

25.

Modulation is also called detection.

a)

True

b)

False

26.

What is Amplitude Modulation?

a)

Change in amplitude of carrier according to modulating signal amplitude

b)

Change in frequency of carrier according to modulating signal amplitude

c)

Change in amplitude of carrier according to modulating signal frequency

d)

Change in amplitude of modulating signal according to carrier signal amplitude

27.

In amplitude modulation frequency and phase of carrier ________

a)

varies simultaneously

b)

varies alternately

c)

initially varies but become same after sometime

d)

remains constant

28.

Envelope of AM wave has the same shape as the message of baseband signal.

a)

True

b)

False

29.

Overmodulation results in?

a)

Distortion

b)

Weakens signal

c)

Strengthens the signal

d)

provides immunity to noise

30.

For getting modulation index equal to 1, carrier amplitude should ________

a)

exceed signal amplitude

b)

be equal to signal amplitude

c)

be lesser than signal amplitude

d)

be equal to 0

31.

The process of varying the parameters of high frequency signal according to low frequency signal is (a)  

32.

The Bandwidth of Amplitude Modulation is ___

a)

ωm

b)

ωm/2

c)

ωm/4

d)

2ωm

33.

By suppressing carrier component from AM wave, we have

a)

SSB

b)

VSB

c)

DSB-SC

d)

DSB-FC

34.

The ring modulator is used for which type a modulation ___

a)

AM

b)

SSB

c)

DSB-SC

d)

VSB

35.

The bandwidth of VSB is ___

a)

fm-fv

b)

fm+fv

c)

fm ±fv

d)

none

36.
What is the amplitude of the graph? 
a)
1
b)
3
c)
6
d)
9
37.
what is the amplitude of y=3sin(7x)-2
a)
7
b)
-2
c)
3
d)
6
38.
Convert 100⁰ to radians
a)
5π/9
b)
π/2
c)
5π/8
d)
5π/6
39.
What is the amplitude of this function?
a)
2
b)
2π
c)
-2
d)
1
40.
What is the domain and range of y=sinx?
a)
D: (-∞, ∞)
R: [-1, 1]
b)
D: (-∞, ∞)
R: [-π, π]
c)
D: (∞, -∞)
R: [-1, 1]
d)
D: (-∞, ∞)
R: [-∞, ∞]
41.
What is the period?
a)
4π
b)
2π
c)
π
d)
8π
42.

A __________ is a piece of information that is communicated through using the senses.

a)

wave

b)

signal

c)

circuit

d)

notification

43.

This is wireless method of sending information uses radio waves

a)

analog

b)

WiFi

c)

landline

d)

GPS

44.

To translate information into the form of code

a)

transmit

b)

encode

c)

signal

d)

encrypt

45.

The passing on, or transfer, of information

a)

transmit

b)

encode

c)

signal

d)

encrypt

46.

Change continuously over time; represented by a continuous smooth curve; can be a range of values

a)

analog signals

b)

digital signals

c)

wireless signals

d)

electric signals

47.

Is discrete and not continuous; represented by two values - either on or off

a)

analog signals

b)

digital signals

c)

wireless signals

d)

electric signals

48.

A signal to or from a computer is encoded into _________________, such as the two values - on (1) or off (0).

a)

analog signal

b)

digital signal

c)

binary numbers

d)

electricity

49.

A single unit of information in quantitative or qualitative form

a)

signal

b)

encryption

c)

data

d)

wave

50.

the unwanted modification of a signal

a)

encryption

b)

noise

c)

analog

d)

modulation

51.

a signal whose frequency is modulated

a)

FM

b)

AM

c)

PM

d)

IM

52.

a signal whose amplitude is modulated

a)

FM

b)

AM

c)

PM

d)

IM

53.

The ratio of amplitudes of modulating wave and carrier wave is called

a)

Modulation index

b)

Modulation factor

c)

Degree of modulation

d)

All the above

54.

In AM, under modulation occurs when

a)

Vm=Vc

b)

Vm<Vc

c)

Vm>Vc

55.

In AM, Over modulation occurs when

a)

Vm=Vc

b)

Vm<Vc

c)

Vm>Vc

56.

In AM, critical modulation occurs when

a)

Vm=Vc

b)

Vm>Vc

c)

Vm<Vc

57.

Bandwidth of AM signal is

a)

fm

b)

2fm

c)

3/2 fm

d)

none of the above

58.

If ma=1 then η % of AM is

a)

100%

b)

30%

c)

33.33%

d)

50%

59.

In Amplitude modulation,

a)

Amplitude of the carrier signal constant

b)

Phase of the carrier signal constant

c)

Frequency of the carrier signal constant

60.

Modulation index is defined as

a)

ratio of message signal frequency to carrier signal amplitude

b)

ratio of message signal amplitude to carrier signal frequency

c)

ratio of message signal amplitude to carrier signal amplitude

d)

ratio of message signal frequency to carrier signal frequency

61.

Amplitude Modulation is also known as

(a)  

62.

Bandwidth of Amplitude Modulation is

a)

2 fm

b)

fm + fc

c)

2 fc

d)

fm-fc

63.

For critical modulation, modulation index will be

a)

m > 1

b)

m=1

c)

m< 1

64.

Amplitude Modulated wave consists of

a)

carrier signal

b)

lower side band

c)

upper side band

d)

all the three

65.

What is the percentage of modulation if the modulating signal is of 7.5V and carrier is of 9V?

a)

100

b)

83.33

c)

91

d)

33

66.

What is the modulation index value if Vmax=5.9v and Vmin=1.2v?

a)

0.5

b)

0.425

c)

0.662

d)

0.75

67.

What is the carrier frequency in an AM wave when its highest frequency component is 850Hz and the bandwidth of the signal is 50Hz?

a)

825

b)

695

c)

625

d)

55

68.

Calculate the power in one of the side band in SSBSC modulation when the carrier power is 124W and there is 80% modulation depth in the amplitude modulated signal.

a)

89.33

b)

64.85

c)

79.36

d)

102

69.

Cross talk is

a)

The disturbance caused in the nearby channel or circuit due to transmitted signal

b)

Adjacent frequency rejection

c)

Generation of closely lying side bands

d)

None of the above

70.

What does modulation consist of?

a)

Technique that involves using the same word or expression in original text in the target text.

b)

Is a word or phrase taken from one language and translated literally, word-for-word, into another language.

c)

Is a foreign word or expression maintained in its original form in the target language.

d)

It’s using a different phrase in the target languages to express the same idea of the source languages.

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