➤ Hello In this page provides you Unguided Data Modems MCQs Question/MCQ In this question Based on the Modulation ,Demodulation, pulse code modulation shift keying and ASK,FSK,PSK etc.
Q.1 AM Stand for
A) Amplitude Mode B) Amplitude Modulation C) Amplitude Model D) None
ANSWER= (B) Amplitude Modulation
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Q.1 Amplitude Modulation is:
A) Change in amplitude of the carrier according to modulating signal B) Change in frequency of the carrier according to modulating signal C) Change in amplitude of the modulating signal according to carrier signal D) None
ANSWER= (A) Change in amplitude of the carrier according to modulating signal
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Q.3 The AM Spectrum consists of ?
A) carrier frequency B) upper side band frequency C) Lower side band frequency D) All of these
ANSWER= (D) All of these
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Q.4 The amount of data transmitted for a given amount of times is called as ?
A) Banwidth B) Frequency C) Noise D) None
ANSWER= (A) Banwidth
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Q.5 In an Amplitude Modulation
A) Amplitude of the carrier varies B) Frequency of the carrier remains constant C) Phase of the carrier remains constant D) All of these
ANSWER= (D) All of these
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Q.6 Analog communication indicates ?
A) AM or FM signal B) No numerical coding C) Continuous signal with varying amplitude or phase D) All of these
ANSWER= (D) All of these
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Q.7 Which of the following types of analog Modulation are ?
A) Phase modulation B) Frequency modulation C) Amplitude modulation D) All of these
ANSWER= (D) All of these
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Q.8 What is the advantage of analog communication over digital communication are ?
A) Data rate is low B) Synchronization is not needed C) Less transmission bandwidth is required D) All of these
ANSWER= (D) All of these
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Q.9 What is the maximum transmission efficiency of an AM signal ?
A) 34.2% B) 40% C) 33.33% D) 32.21%
ANSWER= (C) 33.33%
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Q.10 LSB (Lower side Band) is the band of frequency ?
A) Below the carrier frequency B) Include the carrier frequency C) That lies in AM Spectrum D) Both a & b
ANSWER= (D) Both a & b
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Q.11 USB (upper side band) is the band of frrequency
A) Above the carrier frequency B) Include the carrier frequency C) That liesin AM spectrum D) Both a nad c are correct
ANSWER= (D) Both a nad c are correct
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Q.12 Analog signal may be converted into digital signal by ?
A) Sampling B) Amplitude Modulation C) Filtering D) Mixing
ANSWER= (A) Sampling
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Q.13 In low level amplitude modulation ?
A) Modulation is done at lower power of carrier and modulating signal B) Output power is low C) Power amplifiers are required to boost the signal D) All of these
ANSWER= (D) All of these
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Q.14 In high level amplitude modulation
A) Modulation is done at high power of carrier and modulating signal B) Collector modulation method is high level amplitude modulation C) Power amplifiers are used to boost the carrier and modulating signals before modulation D) All of these
ANSWER= (D) All of these
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Q.15 Which of the following of continuous wave analog modulation is
A) PCM B) AM C) DM D) All of these
ANSWER= (B) AM
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Q.16 The Standard value for Intermediate FREQUENCY (IF) in AM Receivers is ?
A) 430 KHz B) 455 KHz C) 480 KHz D) None
ANSWER= (B) 455 KHz
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Q.17 What is the line connecting the positive and negative peaks of the carrier waveform called ?
A) Peak Line B) Maximum amplitude ceilling C) Modulation index D) Envelope
ANSWER= (D) Envelope
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Q.18 What is the reference line for the modulating signal ?
A) Zero Line B) Carrier peak line C) Modulated peak line D) Un-modulated peak line
ANSWER= (B) Carrier peak line
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Q.19 What happens when the amplitude of the modulating signal is greater than the amplitude of the carrier
A) Decay B) Distortion C) Amplification D) Un-modulated peak line
ANSWER= (B) Distortion
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Q.20 What is the effect of distortion ?
A) Total B) Error information C) Attenuated information D) Amplified information
ANSWER= (B) Error information
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