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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-9

81. One of the advantages of distributing the winding in alternator is to

a) Reduce noise
b) Same on copper
c) Improve voltage waveform
d) Reduce harmonics

Ans: (c)

82. In case of a uniformly distributed winding in an alternator, the value of distribution factor is

a) 0.995
b) 0.90
c) 0.80
d) 0.70

Ans: (a)

83. Two alternators are connected in parallel. Their kVA and kW load shares can be changed by changing respectively their

a) Driving torque and excitation
b) Excitation and driving torque
c) Excitation only
d) Driving torques only

Ans: (b)

84. The voltage of field system for an alternator is usually

a) Less than 200 V
b) Between 200 V 500 V
c) 500 V
d) Above 500 V

Ans: (a)

85. An alternator is capable of delivering power at a particular frequency. The frequency can be increased by

a) Increasing the current supplied to the field electromagnets
b) Reversing the armature rotation
c) Increasing armature speed
d) Reversing the field polarity

Ans: (c)

86. The slip rings employed in a three-phase alternator in hydrostation are insulated for

a) Full armature voltage
b) Extra high tension voltage
c) Low voltage
d) Very high voltage

Ans: (c)

87. In alternator, during hunting when the speed becomes supersynchronous, the damped bars develop

a) Reluctance torque
b) Pseudo-stationary torque
c) Eddy current torque
d) Induction generator torque

Ans: (d)

88. In parallel operation of two alternator, the synchronizing torque comes into operation where there is

a) Phase difference between the two voltage
b) Frequency difference between two voltage
c) Voltage difference between the two voltage
d) Either (a), (b), or (c)

Ans: (d)

89. When a single alternator connected to infinite busbar supplies a local load, the change in excitation of the machine results in change of

a) Power factor
b) Power output
c) Input power
d) Terminal voltage

Ans: (a)

90. For successful parallel operation of two alternators, it is necessary that

a) They are synchronized using synchroscope and dark and bright lamp method of synchronization
b) Their phase sequence, voltage, frequency and polarity be the same
c) Both (a) and (b)
d) None of these

Ans: (c)

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