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Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name ' Maintenance Engineer (Electronics)' And exam conducted in the year 2023. And Question paper code was '083/2023/OL'. Medium of question paper was in Malayalam or English . Booklet Alphacode was ''. 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.
Question60:-If the modulating signal has frequency 10 KHz, the phase modulated
signal with a carrier of
1 MHz can be
A: Asin(2110%t) Bcos(2nt)
B :-Bcos(21105¢+ Asin(2110%))
C:- Beos(2n10%)+Asin(2xé)
:- 8:05(71051-/.4(27103ಬ))
Correct Answer:- Option-B
Question61:-Given two band-limited signals » (0) and *. (t) with band limits 3 KHz
and 5 KHz respectively. What is the Nyquist rate for sampling the convolution of the
51041215, ° ({)* (t) ?
A:-10 KHz
B:-30 KHz
C:-16 KHz
D:-6 KHz
Correct Answer:- Option-D
Question62:-What is the minimum sampling frequency for a band pass signal with
upper limit 10 KHz and lower limit 6 KHz, as per the band pass sampling theorem ?
A:-12 KHz
B:-10 KHz
C:-20 KHz
D:-8 KHz
Correct Answer:- Option-B
Question63:-For a full scale sinusoid with peak magnitude 5 volts, what is the signal
to quantization noise power, with a quantization signal step-size 2, in PCM ?
A:-37.5
B:-12.5
C:-75
D:-25
Correct Answer:- Option-A
Question64:-For a lossless channel, the channel matrix has
A:-All elements 1s
B:-Only one non-zero element in each row
C:-Only one non-zero element in each column
D:-Diagonal elements zero
Correct Answer:- Option-C
Question65:-A source generates three symbols with probabilities 0.6, 0.2 and 0.2 at
a rate of 4000 symbols per second. If the source is generating these symbols