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page-19  Multiple Choice Question (MCQ) of Measurements page-18  Multiple Choice Question (MCQ) of Measurements page-17  Multiple Choice Question (MCQ) of Measurements page-16  Multiple Choice Question (MCQ) of Measurements page-15  Multiple Choice Question (MCQ) of Measurements page-14  Multiple Choice Question (MCQ) of Measurements page-13  Multiple Choice Question (MCQ) of Measurements page-12  Multiple Choice Question (MCQ) of Measurements page-11  Multiple Choice Question (MCQ) of Measurements page-10  Multiple Choice Question (MCQ) of Measurements page-9  Multiple Choice Question (MCQ) of Measurements page-8  Multiple Choice Question (MCQ) of Measurements page-7  Multiple Choice Question (MCQ) of Measurements page-6  Multiple Choice Question (MCQ) of Measurements page-5  Multiple Choice Question (MCQ) of Measurements page-4  Multiple Choice Question (MCQ) of Measurements page-3  Multiple Choice Question (MCQ) of Measurements page-2  Multiple Choice Question (MCQ) of Measurements 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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-3

21. Use of damped winding in alternators results in

a) Elimination of harmonic effects
b) A low resistance path for the currents due to unbalancing of voltage
c) Oscillations when two alternators operate in parallel
d) All of these

Ans: (d)

22. High speed alternators usually have

a) Salient pole rotors
b) Cylindrical rotors
c) Both salient pole and cylindrical rotors
d) None of these

Ans: (b)

23. In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is working as

a) Asynchronous generator
b) Asynchronous motor
c) Synchronous generator
d) Synchronous motor

Ans: (c)

24. Cylindrical rotor alternators have

a) Large length to diameter ratio
b) Small length to diameter ratio
c) Vertical configuration
d) None of these

Ans: (a)

25. In an alternator, the armature reaction is completely magnetizing when the load power factor is

a) Unity
b) 0.7
c) Zero lagging
d) Zero leading

Ans: (d)

26. To ensure effective cooling, cylindrical rotor alternators use

a) Axial ducts only
b) Radial dusts only
c) Forced air cooling
d) Both radial and axial ducts

Ans: (d)

27. Which of the following is not an integral path of a synchronous generator system?

a) Prime mover
b) Excitation system
c) Distribution transformer
d) Protection system

Ans: (c)

28. The main advantage of using fractional pitch winding in an alternator is to reduce

a) Amount of copper in the winding
b) Size of the machine
c) Harmonics in the generated emf
d) Cost of the machine

Ans: (c)

29. Cross magnetization in an alternator field results in output which is

a) True sinusoidal
b) Non sinusoidal
c) Harmonic free
d) None of these

Ans: (b)

30. The pitch factor in rotating electrical machines is defined as the ratio of the resultant emf of a

a) Full pitch to the phase emf
b) Full pitched coil to the of a chorded coil
c) Chorded coil to the of a full pitched coil
d) Chorded coil to the phase emf

Ans: (c)

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