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Signal Analysis and Communications MCQ

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

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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

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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

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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

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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

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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

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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

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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

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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

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Which type of noise reduction by limiters in FM receivers

Jhonson noise

Cosmic noise

Impulse noise

Partition noise

Answer

Correct Answer: Impulse noise

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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

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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

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

Half

Decreased

Doubled

Unchanged

Answer

Correct Answer: Unchanged

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

Answer

Correct Answer: 1

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The number of computations is _________ in the FIR filter

Less

No computations

None of the above

Answer

Correct Answer: More

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Which system requires infinite memory?

FIR filters

IIR filters

Both a and b

None of the above

Answer

Correct Answer: IIR filters

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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

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_________ 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

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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

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

TMS320C3X

TMS320C5X

TMS320C8X

None of the above

Answer

Correct Answer: TMS320C3X

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

TMS320C1X

TMS320C3X

TMS320C4X

None of the above

Answer

Correct Answer: TMS320C1X

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How many types of digital filters are there?

One

Two

Four

Six

Answer

Correct Answer: Two

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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

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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

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The discrete-time systems are categorized into ________

One

Two

Four

Six

Answer

Correct Answer: Six

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There are _________ types of infinite length sequences are there

One

Two

Three

Four

Answer

Correct Answer: Three

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The discrete-time signals are categorized into __________

One

Two

Three

Four

Answer

Correct Answer: Three

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_________ 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

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How many types of redundancies are there?

One

Two

Three

Four

Answer

Correct Answer: Three

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__________ 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

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_____________ is a type of waveform coding

Frequency domain coding

Vector quantization

Pitch excited coder

None of the above

Answer

Correct Answer: Frequency domain coding

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The parameters of speech coding are ________

Bitrate

Quality, delay

Complexity

All of the above

Answer

Correct Answer: All of the above

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__________ 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

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____________ is an application of speech recognition

Information retrieval systems

Source coding

Narrowband cellular radio

None of the above

Answer

Correct Answer: Information retrieval systems

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______ are the parameters of speech

Pitch

Loudness

Quality

All of the above

Answer

Correct Answer: All of the above

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_________ is an application of speech coding

Military communication

Voice alarms

Information retrieval systems

All of the above

Answer

Correct Answer: Military communication

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The kinds of sounds are of ___________

One

Two

Three

Four

Answer

Correct Answer: Two

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The speech signals are _______

One dimensional

Two dimensional

Three dimensional

Multidimensional

Answer

Correct Answer: One dimensional

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_________ 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

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The signals are categorized into ________ based on reflection

One

Two

Three

Four

Answer

Correct Answer: Two

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The signals are categorized into ________ based on repetition nature

One

Two

Three

Four

Answer

Correct Answer: Two

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__________ are the examples of random signals

EEG signal

ECG signal

Speech signal

All of the above

Answer

Correct Answer: All of the above

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

One

Two

Three

Four

Answer

Correct Answer: Three

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The difference between quantized and unquantized is called quantization _______

Error

Coefficient

Ratio

None of the above

Answer

Correct Answer: Error

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The function of the autocorrelation is ______

Even

Odd

Both a and b

None of the above

Answer

Correct Answer: Even

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_____ 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

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The scaling operation also called as __________

Up-sampling

Down-sampling

Both a and b

None of the above

Answer

Correct Answer: Down-sampling

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The zero state response also called as ______ response

Free

Forced

Natural

None of the above

Answer

Correct Answer: Forced

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Which are non negative functions?

PDF

PMF

PDF & PMF

None of the mentioned

Answer

Correct Answer: PDF & PMF

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Constellation diagram is plotted in

Constellation space

Signal space

Orthogonal space

Boundary space

Answer

Correct Answer: Signal space

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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

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A band-pass signal has

DC component

No DC component

No side lobes

Cannot be determined

Answer

Correct Answer: No DC component

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A band-pass signal has a Fourier transform equal to

One

Zero

Infinity

Cannot be determined

Answer

Correct Answer: Zero

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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

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Random things in a communication system are

Timing offset

Device frequency

Attenuation

All of the mentioned

Answer

Correct Answer: All of the mentioned

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8. Fourier transform of a signal gives the

Frequency content

Bandwidth

Frequency content & Bandwidth

None of the mentioned

Answer

Correct Answer: Frequency content & Bandwidth

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ADSL has _____ information channels.

One

Three

Four

None of the mentioned

Answer

Correct Answer: Three

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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

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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

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A base-band signal can be up-converted using

Sine wave

Cosine wave

Filtering

None of the mentioned

Answer

Correct Answer: Cosine wave

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Properties of Fourier transform are

Duality property

Time shifting property

Modulation property

All of the mentioned

Answer

Correct Answer: All of the mentioned

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Properties of impulse function are

Symmetry

Time scaling

Shifting

All of the mentioned

Answer

Correct Answer: All of the mentioned

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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

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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

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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

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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.

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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

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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

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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

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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

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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

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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

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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

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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

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Space loss occurs due to a decrease in

Phase shift

Momentum

Electric field strength

Power

Answer

Correct Answer: Electric field strength

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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

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Which of the given filter has maximum flatness?

Bessel filter

Butterworth filter

Low pass filter

None of these

Answer

Correct Answer: Butterworth filter

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The window gives a number of

Bytes

Frames

Both option a and b

None of these

Answer

Correct Answer: Both option a and b

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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

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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

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________ 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

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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

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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

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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)

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The disadvantages of FIR filter are _________

Complex

Requires more filter coefficient

Simple

Both a and b

Answer

Correct Answer: Both a and b

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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

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How many types of signal processing are there?

One

Two

Three

Four

Answer

Correct Answer: Three

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The signal processing is performed to ____________ the signal

Analyze

Modify

Synthesize

All of the above

Answer

Correct Answer: All of the above

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Analog signals converts into digital signal using _______

Sampling

Quantization

Both a and b

None of the above

Answer

Correct Answer: Both a and b

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How many types of signals are there?

One

Two

Three

Four

Answer

Correct Answer: Two

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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

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The non-recursive FIR filters are always ______

Stable

Unstable

Answer

Correct Answer: Stable

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______ 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

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The impulse response of FIR filter is ______

Finite

Zero

One

Infinite

Answer

Correct Answer: Finite

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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

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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

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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

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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

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The analog signals are categorized into ________

One

Two

Three

Four

Answer

Correct Answer: Two

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