Signal Analysis and Communications MCQs
Signal Analysis and Communications MCQs
Answer these Signal Analysis and Communications MCQs and assess your grip on the subject of Signal Analysis and Communications.
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1: The analog signals are categorized into ________
A. One
B. Two
C. Three
D. Four
2: If discrete-time signal passes through an analog to digital converter we get ______
A. Binary sequence
B. Decimal sequence
C. Hexadecimal sequence
D. None of the above
3: The technique where processing is done on an analog signal is nothing but ______
A. Analog signal processing
B. Digital signal processing
C. Mixed-signal processing
D. None of the above
4: The most convenient and accurate signal processing technique is _____
A. Analog signal processing
B. Digital signal processing
C. Mixed-signal processing
D. None of the above
5: The advantages of digital signal processing are _____
A. Flexible in operation
B. It is a stable system
C. Low cost
D. All of the above
6: The impulse response of FIR filter is ______
A. Finite
B. Zero
C. One
D. Infinite
7: ______ are the major applications of FIR filter
A. Data transmission
B. Speech processing
C. Correlation processing and interpolation
D. All of the above
8: The non-recursive FIR filters are always ______
A. Stable
B. Unstable
9: The advantages of FIR filters are _________
A. Stable
B. Realized in recursive
C. Realized in non-recursive
D. All of the above
10: How many types of signals are there?
A. One
B. Two
C. Three
D. Four
11: Analog signals converts into digital signal using _______
A. Sampling
B. Quantization
C. Both a and b
D. None of the above
12: The signal processing is performed to ____________ the signal
A. Analyze
B. Modify
C. Synthesize
D. All of the above
13: How many types of signal processing are there?
A. One
B. Two
C. Three
D. Four
14: The digital signal processing can be used in _______
A. Speech and audio processing
B. Image and video processing
C. Military and space applications
D. All of the above
15: The disadvantages of FIR filter are _________
A. Complex
B. Requires more filter coefficient
C. Simple
D. Both a and b
16: The number of complex addition in the direct computation of DFT is equal to _____
A. N(N-1)
B. N(N+1)
C. N(N*1)
D. N(1/N)
17: The formula for percentage saving of addition in FFT is __________
A. 100-(number of addition in FFT/ number of addition in DFT)*100
B. 100-(number of addition in DFT/ number of addition in FFT)*100
C. 100-(number of addition in FFT/ number of addition in FFT)*100
D. None of the above
18: The formula for percentage saving of multiplication in FFT is __________
A. 100-(number of multiplication in FFT/ number of multiplication in DFT)*100
B. 100-(number of multiplication in DFT/ number of multiplication in FFT)*100
C. 100-(number of multiplication in FFT/ number of multiplication in FFT)*100
D. None of the above
19: ________ is the disadvantage of digital signal processing
A. Flexible in operation
B. Speed of operation is limited
C. Speed of operation is unlimited
D. None of the above
20: If the processing is on a digital signal then the signal processing is called as _________
A. Analog
B. Digital
C. Mixed
D. None of the above
21: What are the primary features of a transmitter?
A. Lower clock speed
B. Lower transmitting power
C. Higher clock speed
D. None of these
22: The window gives a number of
A. Bytes
B. Frames
C. Both option a and b
D. None of these
23: Which of the given filter has maximum flatness?
A. Bessel filter
B. Butterworth filter
C. Low pass filter
D. None of these
24: 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?
A. 640
B. KHz
C. 900 kHz
D. 440 kHz
E. 260 kHz
25: Space loss occurs due to a decrease in
A. Phase shift
B. Momentum
C. Electric field strength
D. Power
26: 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?
A. 300 kbps
B. 240 kbps
C. 450 kbps
D. 600 kbps
27: 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?
A. 300 KHz
B. 200 KHz
C. 150 KHz
D. 80 KHz
28: If noise figure of a receiver is 1.8 at 20 oC, find its equivalent noise temprature?
A. 474.9 K
B. 384.8 K
C. 234.4 K
D. 184.6 K
29: If a 120 V carrier peak changes from 170 V to 50 V by a modulating signal, find the modulation factor?
A. 0.5
B. 1.5
C. 2.5
D. 3.5
30: RF carrier 15 kV at 1 MHz is amplitude modulated and modulation index is 0.8. Find the peak voltage of the signal?
A. 18 kV
B. 22 kV
C. 26 kV
D. 12 kV
31: A broadcast amplitude modulation radio transmitter radiates 140 kW when the modulation percentage is 75. Find the carrier power?
A. 120 kW
B. 142 kW
C. 109 kW
D. 172 kW
32: The power spectral density of a signal is
A. Even negative and complex
B. Odd, complex, and positive
C. Real, odd, and negative
D. Real, even, and non-negative
33: A 1200 W carrier is amplitude modulated and has a sideband power of 400 W. Find the depth of the modulation?
A. 1.245
B. 0.775
C. 3.689
D. 1.059
34: A modulater is a device used to
A. Differenciates two frequencies
B. Amplify two radio frequency signal
C. Impress the information on to a radio frequency carrier
D. Reduce the modulating power requirement.
35: If the two signals modulate the same carrier with different modulation depths of 0.4 and 0.8. Find the resulting modulation signal?
A. 0.89
B. 0.66
C. 0.54
D. 0.16
36: A balanced modulator is used in the generation of which of the following signal?
A. Frequency Modulation signal
B. DSB- SC signal
C. ISI signal
D. SSB -SC signal
37: In the digital communication system, signals in different frequency bands are
A. Orthogonal
B. Non orthogonal
C. Orthogonal & Non orthogonal
D. None of the mentioned
38: Properties of impulse function are
A. Symmetry
B. Time scaling
C. Shifting
D. All of the mentioned
39: Properties of Fourier transform are
A. Duality property
B. Time shifting property
C. Modulation property
D. All of the mentioned
40: A base-band signal can be up-converted using
A. Sine wave
B. Cosine wave
C. Filtering
D. None of the mentioned
41: A band-pass signal can be down-converted using
A. Sine wave
B. Cosine wave
C. Time delayed wave
D. None of the mentioned
42: In down-conversion multiplication with cosine wave is followed by
A. Low pass filter
B. High pass filter
C. Bandpass filter
D. Bandstop filter
43: ADSL has _____ information channels.
A. One
B. Three
C. Four
D. None of the mentioned
44: 8. Fourier transform of a signal gives the
A. Frequency content
B. Bandwidth
C. Frequency content & Bandwidth
D. None of the mentioned
45: Random things in a communication system are
A. Timing offset
B. Device frequency
C. Attenuation
D. All of the mentioned
46: Which can be used for periodic and non periodic?
A. Fourier series
B. Fourier transforms
C. Fourier series & transforms
D. None of the mentioned
47: A band-pass signal has a Fourier transform equal to
A. One
B. Zero
C. Infinity
D. Cannot be determined
48: A band-pass signal has
A. DC component
B. No DC component
C. No side lobes
D. Cannot be determined
49: Which are orthonormal signal representation?
A. Sine and cosine at same frequency
B. Wavelets
C. Complex sinusoids at a different frequency
D. All of the mentioned
50: Constellation diagram is plotted in
A. Constellation space
B. Signal space
C. Orthogonal space
D. Boundary space
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