Kerala PSC Previous Years Question Paper & Answer

Title : Lineman-PWD (Electrical Wing)
Question Code : A

Page:15


Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'Lineman-PWD (Electrical Wing) ' And exam conducted in the year 2021. And Question paper code was '131/2021'. 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: 15 out of 16
Excerpt of Question Code: 131/2021

97.

98.

99.

100.

Which one the following is NOT a criterion for the parallel operation of transformer?

(A) The transformers are to be connected properly so that the net voltage around the
local loop is not zero.

(B) Three phase transformers must have zero relative phase displacement on the
secondary sides.

(C) The transformers must have same voltage ratio to avoid no load circulatiing current.

(D) There should exist only a limited disparity in the per unit impedances of the
transformers.

A 20 kVA, 50 Hz, 2000/200V distribution transformer has primary turns of 200. The

maximum flux in the core is given by ணை webers.

(A) 0.09 (B) 0.045

(C) 0.0225 (D) 0.2

Which of the following cooling methods is used for very large size transformers?
(A) Natural cooling (B) Oil to air heat exchanger unit

(C) Oil to water heat exchanger unit (D) None of the above

The fusing characteristic is a curve between
(A) Fusing time and voltage.

(B) Fusing time and percentage of fuse current.
(C) Fusing time and Temperature.

(D) Fusing time and material type.

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