Quiz : ISRO Technician B-(Electrical)

#1. Interpoles in dc machine used to....?

reduce the effect of cogging

reduce the effect of crawling

reduce the effect of armature reaction

none of these

#2. Which is the main application of SCR?

Multiplier

Oscillator

Amplifier

Speed control of motors

#3. Which motor is used for power factor improvement?

induction motor

series motor

over excitd synchronous motor

under excitd synchronous motor

#4. The condition for maximum efficiency in a transformer is.....?

copper loss is zero

iron loss is zero

copper loss = iron loss

total loss is zero

#5. In dc generator armature reaction is produced by?

armature current

field current

both armature and field current

none of these

#6. SWG is used to measure....?

resistance

insulation

diameter

none of these

#7. ELCB is protect circuit from....?

over load

short circuit

over current

leakage current

#8. The line voltage in three phase delta connection is....?

same as the phase voltage

two times phase voltage

three times the phase voltage

zero

#9. Typical voltage range of solar cell is…?

0.3 V

0.5 V

0.9 V

1V

#10. The line voltage in three phase delta connection is....?

Zero

same as the phase voltage

Twice as the phase voltage

Thrice as the phase voltage

#11. If the diameter of a finite length conductor reduces to half, then its resistance is....?

remains same

reduce by half

increase four times

increase two times

#12. Power factor of RC circuit is...?

zero

lagging

leading

unity

#13. Resistance of a copper wire is R, four such wires with the same crosssectional area but twice the length are connected in parallel, the net resistance is...?

R

R/2

R/4

R/8

Total=2R/4=R/2

#14. Current transformer employed for....?

measurement of low alternating current

measurement of high alternating current

to step up current

none of these

#15. Sweep of ceiling fan refers to...?

speed of the fan

length of the blade

diameter of circle formed by its rotation

double the length of the blade

Quiz : ISRO Technician B-(Electrical)

#1. Interpoles in dc machine used to....?

#2. Which is the main application of SCR?

#3. Which motor is used for power factor improvement?

#4. The condition for maximum efficiency in a transformer is.....?