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Machines page-10  Multiple Choice Question (MCQ) of D.C. Machines page-9  Multiple Choice Question (MCQ) of D.C. Machines page-8  Multiple Choice Question (MCQ) of D.C. Machines page-7  Multiple Choice Question (MCQ) of D.C. Machines page-6  Multiple Choice Question (MCQ) of D.C. Machines page-5  Multiple Choice Question (MCQ) of D.C. Machines page-4  Multiple Choice Question (MCQ) of D.C. Machines page-3  Multiple Choice Question (MCQ) of D.C. Machines page-2  Multiple Choice Question (MCQ) of D.C. Machines page-1  MCQ of D.C generators page-11  MCQ of D.C generators page-10  MCQ of D.C generators page-9  MCQ of D.C generators page-8  MCQ of D.C generators page-7  MCQ of D.C generators page-6  MCQ of D.C generators page-5

Index

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-generators

Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-2

11. As the speed of an alternator increases, the frequency

a) Increases
b) Decreases
c) Remains constant
d) May increases or decreases depending on the power factor

Ans: (a)

12. The generator which gives dc supply to the rotor of an alternator is called

a) Convertor
b) Exciter
c) Inverter
d) Rectifier

Ans: (b)

13. The number of electrical degrees passed through in oue revoltion of a four pole synchronous alternator is

a) 360°
b) 720°
c) 1440°
d) 2880°

Ans: (a)

14. The rotor of alternator has

a) No slip rings
b) Two slip rings
c) Three slip rings
d) Four slip rings

Ans: (b)

15. Alternator works on the principle of

a) Self and mutual induction
b) Self mutual induction
c) Faraday’s law of electromagnetic induction
d) Mutual induction

Ans: (c)

16. In an alternator, when the load increases due to armature reaction, the terminal voltage

a) Rises
b) Drops
c) Remains unchanged
d) May drop or rise

Ans: (d)

17. In a rotating electrical machine, the chording angle for eliminating fifth harmonic should be

a) 38°
b) 36°
c) 33°
d) 30°

Ans: (b)

18. The exciting field coil of an alternator is generally excited by

a) A separate dc generator driver by some source
b) A separate ac generator drive by some source
c) A dc generator coupled directly to the armature shaft
d) A battery

Ans: (c)

19. The material used for the manufacture of large turbo-alternator is

a) Cold rolled grain oriented steel
b) Hot rolled grain oriented steel
c) Wrought iron
d) Cast steel

Ans: (c)

20. The ratio of armature leakage reactance to synchronous reactance of large size modern alternator is about

a) 0.05
b) 0.2
c) 0.4
d) 0.6

Ans: (b)

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