Kerala PSC Previous Years Question Paper & Answer
Page:5
Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'Instrument Mechanic' And exam conducted in the year 2023. And Question paper code was '158/2023/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.
Correct Answer:- Option-C
Question22:-What is the purpose of providing explosion vent in power transformer?
A:-Air releasing
B:-Heat releasing
C:-Moisture releasing
D:-Pressure releasing
Correct Answer:- Option-D
Question23:-A wound type current transformer has 2 turns in primary and carry
rated current of 100 ampere. What should be the no. of turns in secondary winding
to circular a current of 5 ampere?
A:-40 turns
B:-250 turns
C:-20 turns
D:-50 turns
Correct Answer:- Option-A
Question24:-A 10 kVA, 2500/250 volt, 50 Hz transformer has the short circuit test
power input of 256 watts and open circuit test power input of 225 watts. Calculate
the load at which maximum efficiency occurs if the load power factor is 0.8
lagging?
A:-8.78 kVA
B:-7.5 kVA
C:-8 kVA
D:-10 kVA
Correct Answer:- Option-B
Question25:-At which position, the instrument is to be used which is provided with
gravity control?
A:-Any position
B:-Inclined position
C:-Horizontal position
D:-Vertical position
Correct Answer:- Option-D
Question26:-lf 1 mA current through a measuring instrument causes a full scale
deflection of 1 volt. Then calculate the sensitivity of the instrument.
A:-1 ohm/volt
B:-1 volt/ohm
C:-1000 ohm/volt
D:-1000 volt/ohm
Correct Answer:- Option-C