Quiz : ISRO Technician B -Electrical/2015

#1. The transformer oil used in the transformer provides…?

insulation & cooling

cooling & lubrication

insulation & lubrication

i lubricationnsulation, cooling

#2. Power factor of purely resistive circuit will be…?

zero

unity

leading

lagging

#3. The resistance of a wire will double, if we double its…?

area

length

temperature

weight

#4. The capacity of a capacitor used in the power factor correction is expressed in terms of….?

KVA

KW

KVAR

KWH

#5. Transformers are rated in …?

KVA

KW

KVAR

KV

#6. The main purpose of performing open circuit test test at rated voltage is to measure…?

copper loss

core loss

total loss

insulation resistance

#7. As the frequency increases, the capacitive reactance of the circuit is…?

increase

decrease

remains same

first increase then decrease

#8. The current in an RLC series resonance circuit will be….?

minimum

maximum

infinity

zero

#9. 0.01 Ampere is same as the…?

10 micro ampere

100 micro ampere

1000 micro ampere

10000 micro ampere

#10. Time constant for an R-L series circuit will be….?

R/L

L/R

RL

1/RL

#11. Which of the following DC motor is suitable for high starting torque ?

series motor

shunt motor

compound motor

cumulative compound motor

#12. In a two wattmeter method of measuring 3 phase power, power factor is 0.5 , then one of the wattmeter will read…?

zero

1.4

1.3

w/2

#13. One micron is….?

0.1 mm

1 mm

0.01 mm

0.001 mm

#14. Buchholz relay is a ……?

voltage sensitive device

current sensitive device

gas actuated device

frequency sensitive device

#15. The internal resistance of the ammeter should be…?

very small

medium

high

infinity

Quiz : ISRO Technician B -Electrical/2015

#1. The transformer oil used in the transformer provides…?

#2. Power factor of purely resistive circuit will be…?

#3. The resistance of a wire will double, if we double its…?