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SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generatorsMCQ-Control-SystemMCQ-Measurementsmcq-of-Generation-power-systemMCQ-of-Induction-MotorMCQ-of-Transmission-Distribution

MCQ of Transformer page-2

11. In a transformer, the oil must be free from

a) sulphur
b) odour
c) moisture
d) both (a) and (c)

Ans: (d)

12. In a transformer, the magnetic coupling between the primary and secondary circuit can be increased by

a) increasing the number of turns
b) using soft material for winding
c) using magnetic core of low reluc-tance
d) using transformer oil better quality

Ans: (c)

13. If the density in the core of a transformer is increased

a) the frequency the secondary winding voltage increases
b) waveshape of the secondary winding voltage gets distorted
c) size of the transformer can be reduced
d) eddy current losses increase

Ans: (c)

14.The power factor in a transformer

a) is always unit
b) is always leading
c) is always lagging
d) depends on the power factor of load

Ans: (d)

15. Which of the following transformer will be largest is size?

a) 1 kVA, 50 Hz
b) 1 KVA, 60 Hz
c) 1KVA, 100Hz
d) 1KVA, 500 Hz

Ans: (d)

16. A transformer transforms

a) Current
b) Voltage
c) Frequency
d) Both voltage and current

Ans: (d)

17. A transformer does not change the following

a) Waveform
b) Frequency
c) Voltage
d) Both frequency and waveform

Ans: (d)

18. A transformer provides a path for magnetic flux of

a) High reluctance
b) High conductivity
c) Low reluctance
d) Low conductivity

Ans: (c)

19. An ordinary transformer works on

a) A.C
b) D.C
c) Both a.c. and d.c.
d) Pulsating d.c.

Ans: (a)

20. An ideal transformer is one which has

a) A common core for its primary and secondary winding
b) Core of stainless steel and winding of pure copper wire
c) No losses and magnetic leakage
d) Interleaved primary and secondary windings

Ans: (c)

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