> > Applied Engineering MCQs > Signal Analysis and Communications MCQs

Signal Analysis and Communications MCQ

1. For an Amplitude modulation signal, the bandwidth is 10 kHz, and the highest frequency component present is 450 kHz. Find the carrier frequency used for this amplitude modulation signal?

50 KHz

930 KHz

440 KHz

280 KHz

Answer

Correct Answer: 50 KHz

Note: This Question is unanswered, help us to find answer for this one

2. A TDM link has 25 signal channels, and each channel is sampled at 7 kHz. If each sample is represented by 8 bits and contains an additional bit for synchronization, find the total bit rate for the TDM link?

695 kbps

888 kbps

1407 kbps

1209 kbps

Answer

Correct Answer: 1407 kbps

Note: This Question is unanswered, help us to find answer for this one

3. Frequency frogging is used in carrier system to

Reduce frequencies

Reduce cross-talk

Reduce error rate

Conserve narrowband signals.

Answer

Correct Answer: Reduce cross-talk

Note: This Question is unanswered, help us to find answer for this one

4. In a delta modulation scheme, the step height is 80 mV, and the step width is 2 ms. Find the maximum slope that the staircase can track?

50 V

60 V

40 V

30 V

Answer

Correct Answer: 40 V

Note: This Question is unanswered, help us to find answer for this one

5. Analog data having the highest harmonic at 40 kHz generated by a sensor has been digitized using 6 level PCM; find the generated digital signal rate?

120 kbps

160 kbps

180 kbps

240 kbps

Answer

Correct Answer: 240 kbps

Note: This Question is unanswered, help us to find answer for this one

6. If the turn-on energy loss in a transformer is 55 MJ and turn-off energy loss is 78 mj. If the mean power loss is limited to 220 W, find the maximum switching rate that can be achieved?

1232.7 cycles/s

1654.1 cycles/s

1453.8 cycles/s

1862.9 cycles/s

Answer

Correct Answer: 1654.1 cycles/s

Note: This Question is unanswered, help us to find answer for this one

7. Without any filtering, a broadcast station at 1.800 kHz is heard together with another station at 2800 kHz on a superheterodyne receiver. Find the value of employed IF?

200 kHz

400 kHz

500 kHz

600 kHz

Answer

Correct Answer: 500 kHz

Note: This Question is unanswered, help us to find answer for this one

8. What is the automatic frequency control voltage of the FM transmitter VCO?

Ac voltage

Dc voltage

Ramp voltage

Sine wave voltage.

Answer

Correct Answer: Dc voltage

Note: This Question is unanswered, help us to find answer for this one

9. When a radio receiver is tuned to 600 kHz, its local oscillator provides the mixer with input at 1000 kHz. Find the frequency of other stations?

1400 kHz

1600 kHz

1800 kHz

2200 kHz

Answer

Correct Answer: 1400 kHz

Note: This Question is unanswered, help us to find answer for this one

10. Which type of noise reduction by limiters in FM receivers

Jhonson noise

Cosmic noise

Impulse noise

Partition noise

Answer

Correct Answer: Impulse noise

Note: This Question is unanswered, help us to find answer for this one

11. A system has a receiver noise resistance of 60 ohms, and it is connected to an antenna with an output resistance of 60 ohms. Find the noise figure of the system?

Answer

Correct Answer: 2

Note: This Question is unanswered, help us to find answer for this one

12. In phase modulation, phase deviation is proportional to which of the following.

The wavelength of the message signal

Message signal

The amplitude of the message signal

The phase shift of the message signal

Answer

Correct Answer: The amplitude of the message signal

Note: This Question is unanswered, help us to find answer for this one

13. In FM modulation, when the modulation index increases, the transmitted power?

Half

Decreased

Doubled

Unchanged

Answer

Correct Answer: Unchanged

Note: This Question is unanswered, help us to find answer for this one

14. In a frequency modulation system, the maximum frequency deviation is 2000, and modulating frequency is 2kHz. Find the modulation index ??

Answer

Correct Answer: 1

Note: This Question is unanswered, help us to find answer for this one

15. The number of computations is _________ in the FIR filter

Less

No computations

None of the above

Answer

Correct Answer: More

Note: This Question is unanswered, help us to find answer for this one

16. Which system requires infinite memory?

FIR filters

IIR filters

Both a and b

None of the above

Answer

Correct Answer: IIR filters

Note: This Question is unanswered, help us to find answer for this one

17. The advantages of the multi-rate digital signal processing are ___________

Gives more accuracy

Sampling rate conversion is high

Both a and b

None of the above

Answer

Correct Answer: Both a and b

Note: This Question is unanswered, help us to find answer for this one

18. _________ are the applications of multi-rate digital signal processing

Compact disc

Digital audio

American and European television

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

19. The noise power spectral density is equal to _________

Total power-Bandwidth

Bandwidth/ Total power

Total power/Bandwidth

None of the above

Answer

Correct Answer: Total power/Bandwidth

Note: This Question is unanswered, help us to find answer for this one

20. _____ is a 32-bit fixed-point arithmetic DSP processor

TMS320C3X

TMS320C5X

TMS320C8X

None of the above

Answer

Correct Answer: TMS320C3X

Note: This Question is unanswered, help us to find answer for this one

21. _____ is a 16-bit fixed-point arithmetic DSP processor

TMS320C1X

TMS320C3X

TMS320C4X

None of the above

Answer

Correct Answer: TMS320C1X

Note: This Question is unanswered, help us to find answer for this one

22. How many types of digital filters are there?

One

Two

Four

Six

Answer

Correct Answer: Two

Note: This Question is unanswered, help us to find answer for this one

23. The signal ___________ are the uses of filters

Signal separation

Signal restoration

Both a and b

None of the above

Answer

Correct Answer: Both a and b

Note: This Question is unanswered, help us to find answer for this one

24. What are the limitations of digital signal processing?

Bandwidth restrictions

Finite word length problems

Speed limitations

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

25. The discrete-time systems are categorized into ________

One

Two

Four

Six

Answer

Correct Answer: Six

Note: This Question is unanswered, help us to find answer for this one

26. There are _________ types of infinite length sequences are there

One

Two

Three

Four

Answer

Correct Answer: Three

Note: This Question is unanswered, help us to find answer for this one

27. The discrete-time signals are categorized into __________

One

Two

Three

Four

Answer

Correct Answer: Three

Note: This Question is unanswered, help us to find answer for this one

28. _________ are the common techniques based on the redundancy detection method

Transformation method

Direct data compression method

Parametric extraction method

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

29. How many types of redundancies are there?

One

Two

Three

Four

Answer

Correct Answer: Three

Note: This Question is unanswered, help us to find answer for this one

30. __________ is a type of narrow-band coding

Frequency domain coding

Linear predictive coding

Pitch excited coder

None of the above

Answer

Correct Answer: Pitch excited coder

Note: This Question is unanswered, help us to find answer for this one

31. _____________ is a type of waveform coding

Frequency domain coding

Vector quantization

Pitch excited coder

None of the above

Answer

Correct Answer: Frequency domain coding

Note: This Question is unanswered, help us to find answer for this one

32. The parameters of speech coding are ________

Bitrate

Quality, delay

Complexity

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

33. __________ are the common methods of speech analysis

Harmonorphic filtering

Linear prediction

Short-time Fourier analysis

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

34. ____________ is an application of speech recognition

Information retrieval systems

Source coding

Narrowband cellular radio

None of the above

Answer

Correct Answer: Information retrieval systems

Note: This Question is unanswered, help us to find answer for this one

35. ______ are the parameters of speech

Pitch

Loudness

Quality

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

36. _________ is an application of speech coding

Military communication

Voice alarms

Information retrieval systems

All of the above

Answer

Correct Answer: Military communication

Note: This Question is unanswered, help us to find answer for this one

37. The kinds of sounds are of ___________

One

Two

Three

Four

Answer

Correct Answer: Two

Note: This Question is unanswered, help us to find answer for this one

38. The speech signals are _______

One dimensional

Two dimensional

Three dimensional

Multidimensional

Answer

Correct Answer: One dimensional

Note: This Question is unanswered, help us to find answer for this one

39. _________ are the main elements of digital signal processing system

Quantizer, Sampler

Digital signal processor

Decoder

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

40. The signals are categorized into ________ based on reflection

One

Two

Three

Four

Answer

Correct Answer: Two

Note: This Question is unanswered, help us to find answer for this one

41. The signals are categorized into ________ based on repetition nature

One

Two

Three

Four

Answer

Correct Answer: Two

Note: This Question is unanswered, help us to find answer for this one

42. __________ are the examples of random signals

EEG signal

ECG signal

Speech signal

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

43. Depending upon the number of independent variables the signals are categorized into ________

One

Two

Three

Four

Answer

Correct Answer: Three

Note: This Question is unanswered, help us to find answer for this one

44. The difference between quantized and unquantized is called quantization _______

Error

Coefficient

Ratio

None of the above

Answer

Correct Answer: Error

Note: This Question is unanswered, help us to find answer for this one

45. The function of the autocorrelation is ______

Even

Odd

Both a and b

None of the above

Answer

Correct Answer: Even

Note: This Question is unanswered, help us to find answer for this one

46. _____ parameters are required to calculate correlation between X(n) and Y(n) signals?

Noise signal

Time delay

Attenuation factor

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

47. The scaling operation also called as __________

Up-sampling

Down-sampling

Both a and b

None of the above

Answer

Correct Answer: Down-sampling

Note: This Question is unanswered, help us to find answer for this one

48. The zero state response also called as ______ response

Free

Forced

Natural

None of the above

Answer

Correct Answer: Forced

Note: This Question is unanswered, help us to find answer for this one

49. Which are non negative functions?

PDF

PMF

PDF & PMF

None of the mentioned

Answer

Correct Answer: PDF & PMF

Note: This Question is unanswered, help us to find answer for this one

50. Constellation diagram is plotted in

Constellation space

Signal space

Orthogonal space

Boundary space

Answer

Correct Answer: Signal space

Note: This Question is unanswered, help us to find answer for this one

51. Which are orthonormal signal representation?

Sine and cosine at same frequency

Wavelets

Complex sinusoids at a different frequency

All of the mentioned

Answer

Correct Answer: All of the mentioned

Note: This Question is unanswered, help us to find answer for this one

52. A band-pass signal has

DC component

No DC component

No side lobes

Cannot be determined

Answer

Correct Answer: No DC component

Note: This Question is unanswered, help us to find answer for this one

53. A band-pass signal has a Fourier transform equal to

One

Zero

Infinity

Cannot be determined

Answer

Correct Answer: Zero

Note: This Question is unanswered, help us to find answer for this one

54. Which can be used for periodic and non periodic?

Fourier series

Fourier transforms

Fourier series & transforms

None of the mentioned

Answer

Correct Answer: Fourier transforms

Note: This Question is unanswered, help us to find answer for this one

55. Random things in a communication system are

Timing offset

Device frequency

Attenuation

All of the mentioned

Answer

Correct Answer: All of the mentioned

Note: This Question is unanswered, help us to find answer for this one

56. 8. Fourier transform of a signal gives the

Frequency content

Bandwidth

Frequency content & Bandwidth

None of the mentioned

Answer

Correct Answer: Frequency content & Bandwidth

Note: This Question is unanswered, help us to find answer for this one

57. ADSL has _____ information channels.

One

Three

Four

None of the mentioned

Answer

Correct Answer: Three

Note: This Question is unanswered, help us to find answer for this one

58. In down-conversion multiplication with cosine wave is followed by

Low pass filter

High pass filter

Bandpass filter

Bandstop filter

Answer

Correct Answer: Low pass filter

Note: This Question is unanswered, help us to find answer for this one

59. A band-pass signal can be down-converted using

Sine wave

Cosine wave

Time delayed wave

None of the mentioned

Answer

Correct Answer: Cosine wave

Note: This Question is unanswered, help us to find answer for this one

60. A base-band signal can be up-converted using

Sine wave

Cosine wave

Filtering

None of the mentioned

Answer

Correct Answer: Cosine wave

Note: This Question is unanswered, help us to find answer for this one

61. Properties of Fourier transform are

Duality property

Time shifting property

Modulation property

All of the mentioned

Answer

Correct Answer: All of the mentioned

Note: This Question is unanswered, help us to find answer for this one

62. Properties of impulse function are

Symmetry

Time scaling

Shifting

All of the mentioned

Answer

Correct Answer: All of the mentioned

Note: This Question is unanswered, help us to find answer for this one

63. In the digital communication system, signals in different frequency bands are

Orthogonal

Non orthogonal

Orthogonal & Non orthogonal

None of the mentioned

Answer

Correct Answer: Orthogonal

Note: This Question is unanswered, help us to find answer for this one

64. A balanced modulator is used in the generation of which of the following signal?

Frequency Modulation signal

DSB- SC signal

ISI signal

SSB -SC signal

Answer

Correct Answer: DSB- SC signal

Note: This Question is unanswered, help us to find answer for this one

65. If the two signals modulate the same carrier with different modulation depths of 0.4 and 0.8. Find the resulting modulation signal?

0.89

0.66

0.54

0.16

Answer

Correct Answer: 0.89

Note: This Question is unanswered, help us to find answer for this one

66. A modulater is a device used to

Differenciates two frequencies

Amplify two radio frequency signal

Impress the information on to a radio frequency carrier

Reduce the modulating power requirement.

Answer

Correct Answer: Reduce the modulating power requirement.

Note: This Question is unanswered, help us to find answer for this one

67. A 1200 W carrier is amplitude modulated and has a sideband power of 400 W. Find the depth of the modulation?

1.245

0.775

3.689

1.059

Answer

Correct Answer: 0.775

Note: This Question is unanswered, help us to find answer for this one

68. The power spectral density of a signal is

Even negative and complex

Odd, complex, and positive

Real, odd, and negative

Real, even, and non-negative

Answer

Correct Answer: Real, even, and non-negative

Note: This Question is unanswered, help us to find answer for this one

69. A broadcast amplitude modulation radio transmitter radiates 140 kW when the modulation percentage is 75. Find the carrier power?

120 kW

142 kW

109 kW

172 kW

Answer

Correct Answer: 109 kW

Note: This Question is unanswered, help us to find answer for this one

70. RF carrier 15 kV at 1 MHz is amplitude modulated and modulation index is 0.8. Find the peak voltage of the signal?

18 kV

22 kV

26 kV

12 kV

Answer

Correct Answer: 12 kV

Note: This Question is unanswered, help us to find answer for this one

71. If a 120 V carrier peak changes from 170 V to 50 V by a modulating signal, find the modulation factor?

0.5

1.5

2.5

3.5

Answer

Correct Answer: 0.5

Note: This Question is unanswered, help us to find answer for this one

72. If noise figure of a receiver is 1.8 at 20 oC, find its equivalent noise temprature?

474.9 K

384.8 K

234.4 K

184.6 K

Answer

Correct Answer: 234.4 K

Note: This Question is unanswered, help us to find answer for this one

73. In frequency modulation broadcast, the maximum deviation is 80 kHz, and the maximum modulating frequency is 20 kHz. In reference to Carson's rule, find the maximum required bandwidth?

300 KHz

200 KHz

150 KHz

80 KHz

Answer

Correct Answer: 200 KHz

Note: This Question is unanswered, help us to find answer for this one

74. Analog data with the highest harmonic at 40 kHz generated by a sensor has been digitized using 6 level PCM. Find the rate at which digital signal generated?

300 kbps

240 kbps

450 kbps

600 kbps

Answer

Correct Answer: 240 kbps

Note: This Question is unanswered, help us to find answer for this one

75. Space loss occurs due to a decrease in

Phase shift

Momentum

Electric field strength

Power

Answer

Correct Answer: Electric field strength

Note: This Question is unanswered, help us to find answer for this one

76. For an Amplitude modulation signal, the bandwidth is 20 kHz, and the highest frequency component present is 650 kHz. Find the carrier frequency used for this amplitude modulation signal?

640

KHz

900 kHz

440 kHz

260 kHz

Answer

Correct Answer: 640

Note: This Question is unanswered, help us to find answer for this one

77. Which of the given filter has maximum flatness?

Bessel filter

Butterworth filter

Low pass filter

None of these

Answer

Correct Answer: Butterworth filter

Note: This Question is unanswered, help us to find answer for this one

78. The window gives a number of

Bytes

Frames

Both option a and b

None of these

Answer

Correct Answer: Both option a and b

Note: This Question is unanswered, help us to find answer for this one

79. What are the primary features of a transmitter?

Lower clock speed

Lower transmitting power

Higher clock speed

None of these

Answer

Correct Answer: None of these

Note: This Question is unanswered, help us to find answer for this one

80. If the processing is on a digital signal then the signal processing is called as _________

Analog

Digital

Mixed

None of the above

Answer

Correct Answer: Digital

Note: This Question is unanswered, help us to find answer for this one

81. ________ is the disadvantage of digital signal processing

Flexible in operation

Speed of operation is limited

Speed of operation is unlimited

None of the above

Answer

Correct Answer: Speed of operation is limited

Note: This Question is unanswered, help us to find answer for this one

82. The formula for percentage saving of multiplication in FFT is __________

100-(number of multiplication in FFT/ number of multiplication in DFT)*100

100-(number of multiplication in DFT/ number of multiplication in FFT)*100

100-(number of multiplication in FFT/ number of multiplication in FFT)*100

None of the above

Answer

Correct Answer: 100-(number of multiplication in FFT/ number of multiplication in DFT)*100

Note: This Question is unanswered, help us to find answer for this one

83. The formula for percentage saving of addition in FFT is __________

100-(number of addition in FFT/ number of addition in DFT)*100

100-(number of addition in DFT/ number of addition in FFT)*100

100-(number of addition in FFT/ number of addition in FFT)*100

None of the above

Answer

Correct Answer: 100-(number of addition in FFT/ number of addition in DFT)*100

Note: This Question is unanswered, help us to find answer for this one

84. The number of complex addition in the direct computation of DFT is equal to _____

N(N-1)

N(N+1)

N(N*1)

N(1/N)

Answer

Correct Answer: N(N-1)

Note: This Question is unanswered, help us to find answer for this one

85. The disadvantages of FIR filter are _________

Complex

Requires more filter coefficient

Simple

Both a and b

Answer

Correct Answer: Both a and b

Note: This Question is unanswered, help us to find answer for this one

86. The digital signal processing can be used in _______

Speech and audio processing

Image and video processing

Military and space applications

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

87. How many types of signal processing are there?

One

Two

Three

Four

Answer

Correct Answer: Three

Note: This Question is unanswered, help us to find answer for this one

88. The signal processing is performed to ____________ the signal

Analyze

Modify

Synthesize

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

89. Analog signals converts into digital signal using _______

Sampling

Quantization

Both a and b

None of the above

Answer

Correct Answer: Both a and b

Note: This Question is unanswered, help us to find answer for this one

90. How many types of signals are there?

One

Two

Three

Four

Answer

Correct Answer: Two

Note: This Question is unanswered, help us to find answer for this one

91. The advantages of FIR filters are _________

Stable

Realized in recursive

Realized in non-recursive

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

92. The non-recursive FIR filters are always ______

Stable

Unstable

Answer

Correct Answer: Stable

Note: This Question is unanswered, help us to find answer for this one

93. ______ are the major applications of FIR filter

Data transmission

Speech processing

Correlation processing and interpolation

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

94. The impulse response of FIR filter is ______

Finite

Zero

One

Infinite

Answer

Correct Answer: Finite

Note: This Question is unanswered, help us to find answer for this one

95. The advantages of digital signal processing are _____

Flexible in operation

It is a stable system

Low cost

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

96. The most convenient and accurate signal processing technique is _____

Analog signal processing

Digital signal processing

Mixed-signal processing

None of the above

Answer

Correct Answer: Digital signal processing

Note: This Question is unanswered, help us to find answer for this one

97. The technique where processing is done on an analog signal is nothing but ______

Analog signal processing

Digital signal processing

Mixed-signal processing

None of the above

Answer

Correct Answer: Analog signal processing

Note: This Question is unanswered, help us to find answer for this one

98. If discrete-time signal passes through an analog to digital converter we get ______

Binary sequence

Decimal sequence

Hexadecimal sequence

None of the above

Answer

Correct Answer: Binary sequence

Note: This Question is unanswered, help us to find answer for this one

99. The analog signals are categorized into ________

One

Two

Three

Four

Answer

Correct Answer: Two

Note: This Question is unanswered, help us to find answer for this one

Applied Engineering MCQs | Topic-wise

MCQ on Advanced Electrical/Mechanical Systems	MCQ on Applied Mechanics
MCQ on Basic Applied Engineering	MCQ on Circuits
MCQ on Design & Analysis of Control Systems	MCQ on Electrical Systems
MCQ on Engineering Computation	MCQ on Engineering Economic Analysis
MCQ on Engineering Materials and Processes	MCQ on Foundations of Engineering
MCQ on General Chemistry	MCQ on Hydraulics and Pneumatics
MCQ on Manufacturing Processes	MCQ on Mechanical Measurements & Instrumentation
MCQ on Mechanical Systems	MCQ on Motors & Controls
MCQ on Principles of Microeconomics	MCQ on Reliability and Failure Analysis
MCQ on Senior Design Project	MCQ on Signal Analysis and Communications
General Applied Engineering MCQs