Question 1

Which of the following is not necessarily an advantage of FM over AM?

Accepted Answer

A)  less modulating power is required
B)  better noise immunity is provided
C)  higher bandwidth is required
D)  carrier is of any shapeE) None of the above
F) A) and C)

Question 2

Carrier wave in modulation is a resultant wave.

Accepted Answer

A) True 
 B)False

Question 3

Frequency modulation index defines the relationship between the_________  and bandwidth of transmitted signal.

Accepted Answer

A)  frequency of message signal
B)  amplitude of message signal
C)  amplitude of carrier signal
D)  frequency of carrier signalE) B) and C)
F) A) and D)

Question 4

Spread spectrum is used for

Accepted Answer

A)  encrypting signal
B)  hiding signal
C)  encrypting & hiding signal
D)  none of the mentionedE) B) and C)
F) A) and B)

Question 5

A cordless telephone that uses separate frequencies for transmission in base and portable units is called_________

Accepted Answer

A)  half duplex
B)  duplex
C)  simplex
D)  one-way communicationE) A) and B)
F) A) and C)

Question 6

Which conveys more information?

Accepted Answer

A)  high probability event
B)  low probability event
C)  high & low probability event
D)  none of the mentionedE) A) and C)
F) B) and D)

Question 7

A duplex arrangement use separate frequencies for transmission.

Accepted Answer

A) True 
 B)False

Question 8

Which is a quantization process?

Accepted Answer

A)  rounding
B)  truncation
C)  rounding & truncation
D)  none of the mentionedE) A) and B)
F) None of the above

Question 9

Which of the following is the ratio of the throughput data rate per Hertz?

Accepted Answer

A)  bandwidth efficiency
B)  spectral density
C)  power efficiency
D)  power densityE) B) and C)
F) None of the above

Question 10

PLL in FM detection stands for_________

Accepted Answer

A)  phase locked loop
B)  programmable logic loop
C)  phase locked logic
D)  programmable locked loopE) A) and B)
F) B) and C)

Question 11

The upper and lower sideband frequencies for 5KHz amplitude modulation with a 30KHz carrier frequency will be?

Accepted Answer

A)  35khz and 25khz
B)  34khz and 24khz
C)  25khz and 35khz
D)  0.35khz and 0.25khzE) A) and B)
F) A) and C)

Question 12

What is number of possible outputs if there is 7 line digital input?

Accepted Answer

A)  64
B)  32
C)  16
D)  128E) All of the above
F) B) and C)

Question 13

For a low level AM system, amplifier modulated stage must have_________

Accepted Answer

A)  harmonic devices
B)  linear devices
C)  non-linear devices
D)  class a amplifiersE) All of the above
F) C) and D)

Question 14

Frequency modulated signal is regarded as the phase modulated signal in which the modulating wave is differentiated before modulation.

Accepted Answer

A) True 
 B)False

Question 15

Which polarization is used to reduce the depolarization effect on received waves?

Accepted Answer

A)  circular polarization
B)  linear polarization
C)  atomic polarization
D)  dipolar polarizationE) A) and B)
F) A) and C)

Question 16

Which of the following frequency is not transmitted in AM transmission?

Accepted Answer

A)  upper side band frequency
B)  carrier frequency
C)  lower side band frequency
D)  audio frequencyE) B) and C)
F) A) and D)

Question 17

What is the bandwidth required in SSB signal?

Accepted Answer

A)  fm
B)  2fm
C)  > 2fm
D)  < 2fmE) B) and D)
F) A) and B)

Question 18

Phase array radar can track many targets together.

Accepted Answer

A) True 
 B)False

Question 19

For a phase modulated signal, the frequency deviation is proportional to

Accepted Answer

A)  frequency only
B)  amplitude only
C)  only width
D)  phase onlyE) All of the above
F) A) and B)

Question 20

Inductance and capacitance of a line is 0.8

Accepted Answer

A)  158
B)  166
C)  143
D)  127E) All of the above
F) A) and D)

Exam 1: Modulation and Demodulation Techniques

Which conveys more information?

Correct AnswerverifiedShow Answer

A cordless telephone that uses separate frequencies for transmission in base and portable units is called_________

Correct AnswerverifiedShow Answer

What is number of possible outputs if there is 7 line digital input?

Correct AnswerverifiedShow Answer

Frequency modulation index defines the relationship between the_________ and bandwidth of transmitted signal.

Correct AnswerverifiedShow Answer

Phase array radar can track many targets together.

Correct AnswerverifiedShow Answer

The upper and lower sideband frequencies for 5KHz amplitude modulation with a 30KHz carrier frequency will be?

Correct AnswerverifiedShow Answer

For a low level AM system, amplifier modulated stage must have_________

Correct AnswerverifiedShow Answer

Which of the following is the ratio of the throughput data rate per Hertz?

Correct AnswerverifiedShow Answer

A duplex arrangement use separate frequencies for transmission.

Correct AnswerverifiedShow Answer

Which is a quantization process?

Correct AnswerverifiedShow Answer

PLL in FM detection stands for_________

Correct AnswerverifiedShow Answer

Inductance and capacitance of a line is 0.8

Correct AnswerverifiedShow Answer

For a phase modulated signal, the frequency deviation is proportional to

Correct AnswerverifiedShow Answer

Which of the following is not necessarily an advantage of FM over AM?

Correct AnswerverifiedShow Answer

Carrier wave in modulation is a resultant wave.

Correct AnswerverifiedShow Answer

Which polarization is used to reduce the depolarization effect on received waves?

Correct AnswerverifiedShow Answer

What is the bandwidth required in SSB signal?

Correct AnswerverifiedShow Answer

Spread spectrum is used for

Correct AnswerverifiedShow Answer

Frequency modulated signal is regarded as the phase modulated signal in which the modulating wave is differentiated before modulation.

Correct AnswerverifiedShow Answer

Which of the following frequency is not transmitted in AM transmission?

Correct AnswerverifiedShow Answer

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