Related Topics

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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-7

61. In thermal stations, the number of poles used in alternators are usually

a) 48
b) 12
c) 24
d) None

Ans: (d)

62. In a synchronous alternator, the frequency f in Hz is given by

a) ƒ = PN/120
b) ƒ = PN/60
c) ƒ = P/60N
d) ƒ = N/60P

Ans: (a)

63. In case of two alternators running in parallel and perfectly synchronized, the synchronizing power is

a) zero
b) positive
c) negative
d) ideally infinite

Ans: (c)

64. On keeping the input to the prime mover of an alternator constant and increasing the excitation

a) kVA becomes leading
b) kVA become lagging
c) kW will change
d) pf of the load remains unaltered

Ans: (b)

65. If an alternator is operating at a leading power factor, its voltage regulation is

a) more than one
b) equal to zero
c) negative
d) none of these

Ans: (c)

66. Hunting in synchronous machines can be reduced by using

a) damped bars
b) flywheel
c) machines having suitable synchronization power
d) all of these

Ans: (d)

67. In parallel operation of alternators, the synchronizing power is maximum, if armatures have

a) reactance equal to resistance
b) reactance less than resistances
c) reactance greater than resistances
d) none of these

Ans: (d)

68. For same power rating, the higher voltage alternator is

a) larger in size
b) smaller in size
c) cheaper
d) costlier

Ans: (b)

69. To run two alternators in parallel, the black Amp test is performed to ensure proper

a) voltage matching
b) frequency matching
c) phase difference matching
d) phase sequence matching

Ans: (b)

70. In an a.c. machine, the armature winding is kept stationary while the field winding is kept rotating for the following reason

a) armature handles very large currents and high voltages
b) armature friction deep slots to accommodate large coils is easy if armature is kept stationary
c) easy of cooling the stator than rotor
d) none of these

Ans: (d)

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