Kerala PSC Previous Years Question Paper & Answer
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Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'Workshop Instructor/ Demonstrator/ Instructor Grade II in Electronics and Communication' And exam conducted in the year 2023. And Question paper code was '058/2023'. Medium of question paper was in Malayalam or English . Booklet Alphacode was 'A'. Answer keys are given at the bottom, but we suggest you to try answering the questions yourself and compare the key along wih to check your performance. Because we would like you to do and practice by yourself.
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058/23
The modulation index of an AM wave is changed from 0 to 1. The transmitted power
is
A) Unchanged B) Halved
C) Doubled D) Increased by 50 percent
Vestigial Sideband Modulation is used for
A) HF point to point communication B) TV broadcasting
C) Stereo broadcasting D) None of these
In an AM wave useful power is carried by
A) Carrier B) Sidebands
C) Both sidebands and carrier D) None of the above
Overmodulation occurs in AM, when signal amplitude is carrier amplitude.
A) Equal to B) Greater than
C) Less than D) None of the above
The amount of frequency deviation in FM signal depends on
A) Amplitude of the modulating signal B) Carrier frequency
C) Modulating frequency D) Transmitter amplifier
The modulation index of FM is given by
A) frequency deviation / modulating frequency
B) modulating frequency / frequency deviation
C) modulating frequency / carrier frequency
D) carrier frequency / modulating frequency
Which modulator is used for generating DSB-SC signal ?
A) Square law modulator B) Balanced modulator
C) Envelope detector D) Armstrong modulator
Which of the following modulation technique is having lowest bandwidth ?
A) AM B) FM
C) DSB SC 0) 558 56
Which of the following is not an advantage of FM over AM ?
A) Better noise immunity is provided B) Lower bandwidth is required
C) The transmitted power is more useful D) Less modulating power is used
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