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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 page-1  Objective questions and answers or MCQ of Electrical Machines page-22  Objective questions and answers or MCQ of Electrical Machines page-21  Objective questions and answers or MCQ of Electrical Machines page-20  Objective questions and answers or MCQ of Electrical Machines page-19  Objective questions and answers or MCQ of Electrical Machines page-18  Objective questions and answers or MCQ of Electrical Machines page-17  Objective questions and answers or MCQ of Electrical Machines page-16  Objective questions and answers or MCQ of Electrical Machines page-15  Objective questions and answers or MCQ of Electrical Machines page-14  Objective questions and answers or MCQ of Electrical Machines page-13  Objective questions and answers or MCQ of Electrical Machines page-12  Objective questions and answers or MCQ of Electrical Machines page-11  Objective questions and answers or MCQ of Electrical Machines page-10  Objective questions and answers or MCQ of Electrical Machines 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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-10

91. The following are the experimental data required for politer method for finding the voltage regulation of an alternator

a) No load curve, shunt circuit test values
b) No load curve, zero power factor curve
c) Zero power factor curve, short circuit test curve
d) None of these

Ans: (b)

92. Of the following conditions, the one which does not have to be met by alternators working in parallel is

a) Terminal voltage of each machine must be the same
b) The machines must have the same phase rotation
c) The machines must operate at the same frequency
d) The machines must have equal ratings

Ans: (d)

93. Salient-pole rotors are not used for high speed turbo alternators because of

a) Large eddy loss
b) High centrifugal force and winding loss
c) Excessive bearing friction
d) Harmful mechanical oscillations

Ans: (b)

94. The power factors of an alternator is determined by its

a) Speed
b) Loud
c) Excitation
d) Prime mover

Ans: (b)

95. The short circuit characteristic of an alternator is

a) Always linear
b) Always nonlinear
c) Sometimes liner and sometimes nonlinear
d) None of these

Ans: (a)

96. With a load p.f. of unity, the effect of armature reaction on the main-field flux of an alternator is

a) Nominal
b) Demagnetizing
c) Magnetizing
d) Distortional

Ans: (d)

97. In an alternator, if the armature current is leading the generated voltage by 90, the effect of armature reaction will be

a) Demagnetizing
b) Magnetizing
c) Partly magnetizing and partly cross-magnetising
d) None of these

Ans: (b)

98. An alternator and a synchronous motor are connected to an infinite bus. Both are working at unity p.f. and reactive power handled by them is

a) Both deliver it to the bus
b) Both absorb it from the bus
c) Alternator is delivering it and motor is absorbing it
d) Neither of these machines is delivering nor absorbing it.

Ans: (d)

99. In order to reduce the harmonics in the emf generated in an alternator

a) Slots are skewed
b) Silent pole tips are chamfered
c) Winding is well distributed
d) All of these

Ans: (d)

100. large synchronous machines are constructed with armature winding on the stator because stationary armature winding

a) Can be insulated satisfactorily for higher voltages
b) Can be cooled more efficiently
c) All of these
d) Both (a) and (b)

Ans: (d)

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