## Kerala PSC Previous Years Question Paper & Answer

Title : Foreman (Electrical), Assistant Manager (Electrical) etc - Industries & Commerce, The Kerala Ceramics Ltd etc
Question Code : A

Page:13

Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'Foreman (Electrical), Assistant Manager (Electrical) etc - Industries & Commerce, The Kerala Ceramics Ltd etc ' And exam conducted in the year 2022. And Question paper code was '075/2022'. 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.

page: 13 out of 16
Excerpt of Question Code: 075/2022

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The aquadag coating in CRO is used to collect
(A) _ primary electrons (B) secondary emission electrons
(0 ‏طامط‎ (A) and (8) (D) None of the above

The sweep generator of a CRO is used to produce
(A) ൧ sawtooth voltage for the horizontal deflection of electron beam.
(B) A sinusoidal voltage for the vertical deflection of the electron beam
(೮) ൧ sinusoidal voltage for the horizontal deflection of the electron beam
(D) A sawtooth voltage for the vertical deflection of the electron beam

A moving coil ammeter has a uniform scale with 100 divisions and gives full scale
reading of 10 A. The instrument can read upto 1/5" of a scale division with a fair degree
of certainity. Determine the resolution of the instrument in amperes.

(A) 0.01A (8) 0.04 &
(൭ ۸ (ಐ) 0.03 ^

Which of the following system has memory ?
(^) y(t) = x(t) (8) y(t) = tr(t) + 2x(t)
(C) y(t) =ax(t)—b (0) y(t) =x(t) + x(t- I)

A signal has a spectrum ranging from 0 to 15 kHz is to be sampled to be converted to
discrete form. What is the minimum number of samples per second that must be taken to
ensure recovery ?

(A) 7,500 samples /second (B) 30,000 samples /second

(C) 15,000 samples/second (D) 60,000 samples /second

Determine the fundamental period of the following signal :
x(n) =10cos(0.27n)
(A) 10 (B) 5
(൭ 15 (D) 20
A system is described by T[x(n)] = g(n) x(n).
Which of the following is correct for the system ?

(A) Non-linear (B) Time invariant
(0) Memoryless (D) Non casual
Check the casuality and stability of the following system :
h(n) = (0.5
(A) Non casual and 8180 stable (B) Casual and BIBO stable
(C) Casual and unstable (D) Non casual and unstable

A necessary and sufficient condition for BIBO stability of discrete time LTI system is that
(^) Magnitude of every root of its characteristic equation must be > 1
(B) Magnitude of every root of its characteristic equation must be < 1
(C) Magnitude of every root of its characteristic equation must be = 1
(D) Magnitude of every root of its characteristic equation must be 2 |

The system is linear if it is