Communication Engineering solved MCQs.

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FM is a part of general class of modulation known as FM is a part of general class of modulation known as angle modulation phase modulation amplitude modulation frequency modulation discuss The answer is: A. angle modulation
Which of the following is used to vary the frequency of the carrier frequency in accordance with the baseband signal amplitude variations in direct method of FM generation? Which of the following is used to vary the frequency of the carrier frequency in accordance with the baseband signal amplitude variations in direct method of FM generation? integrator envelope detector multivibrator voltage controlled oscillators discuss The answer is: D. voltage controlled oscillators
One of the advantage of using a high frequency carrier wave is that it dissipates very small power One of the advantage of using a high frequency carrier wave is that it dissipates very small power. true false discuss The answer is: A. true
A PAM signal can be detected using A PAM signal can be detected using low pass filter high pass filter band pass filter all pass filter discuss The answer is: A. low pass filter
Measured on the ground, the field strength of a horizontally polarized half wave dipole antenna is strongest Measured on the ground, the field strength of a horizontally polarized half wave dipole antenna is strongest in one direction in two directions depends on the number of elements depends on the shape of antenna discuss The answer is: B. in two directions
PSK stands for Pulse Shift Keying PSK stands for Pulse Shift Keying. true false discuss The answer is: B. false
Which term is used for moving PCM samples from one time slot to another? Which term is used for moving PCM samples from one time slot to another? time switching space switching phase switching frequency switching discuss The answer is: A. time switching
Power can be coupled into or out of a waveguide with a magnetic field probe Power can be coupled into or out of a waveguide with a magnetic field probe. true false discuss The answer is: B. false
What is the full form of LOS? What is the full form of LOS? level of signal line of sight loss of signal level of sight discuss The answer is: B. line of sight
How we can define the satisfactory performance of an analog microwave system? How we can define the satisfactory performance of an analog microwave system? carrier to noise ratio that exceeds a given value carrier to noise ratio that is below a given value an erp value that exceeds a given value an erp value that is below a given value discuss The answer is: A. carrier to noise ratio that exceeds a given value
RGB stands for RGB stands for red green brown red green black red gold blue red green blue discuss The answer is: A. red green brown
How many lines are there in an NTSC signal? How many lines are there in an NTSC signal? 1024 1856 625 525 discuss The answer is: D. 525
Luminance refers to Luminance refers to contrast diffusion brightness aperture discuss The answer is: C. brightness
Linear modulation techniques are not bandwidth efficient Linear modulation techniques are not bandwidth efficient. true false discuss The answer is: B. false
Which of the following is not a commlinear modulation technique? Which of the following is not a linear modulation technique? oqpsk π/4 qpsk fsk bpsk discuss The answer is: C. fsk
In BPSK, the___________________of constant amplitude carrier signal is switched between two values according to the two possible values In BPSK, the of constant amplitude carrier signal is switched between two values according to the two possible values. amplitude phase frequency angle discuss The answer is: B. phase
BPSK uses non-coherent demodulator BPSK uses non-coherent demodulator. true false discuss The answer is: B. false
DPSK uses coherent form of PSK DPSK uses coherent form of PSK. true false discuss The answer is: B. false
In DPSK system, input signal is differentially encoded and then modulated using a___________modulator In DPSK system, input signal is differentially encoded and then modulated using a modulator. amplitude frequency bpsk qpsk discuss The answer is: C. bpsk
QPSK provides twice the bandwidth efficiency and energy efficiency as compared to BPSK QPSK provides twice the bandwidth efficiency and energy efficiency as compared to BPSK. twice half same four times discuss The answer is: C. same

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