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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

MCQ of D.C generators page-8

71. If number of poles in a lap wounded generator is increased by a factor 2, then generated emf will

a) Increase by a factor of 4
b) Remain same
c) Increase by a factor 2
d) Decrease by a factor 2

Ans: (b)

72. Which of the following accounts for smallest part of full load losses?

a) Magnetic losses
b) Mechanical losses
c) Field copper loss
d) Armature copper loss

Ans: (b)

73. Stray losses in a d.c generator are same as

a) Mechanical losses
b) Magnetic losses
c) Winding losses
d) Both (a) and (b)

Ans: (d)

74. In dc generator, the principal reasons for delay in the reversal of current is

a) Reactance voltage
b) The capacitor action with two segment as electrodes and mica as the dielectric
c) The air gap between the brushes and the commutator surface
d) None of these

Ans: (a)

75. The circuit resistance of dc generator is the resistance of

a) Field
b) Brush
c) Armature
d) Compensating pole

Ans: (a)

76. One method of neutralizing the armature reaction in a dc generator is to

a) Shift the brushes in lagging direction of rotation
b) Shift the brushes in leading direction of rotation
c) Interchange the terminals at the brushes
d) None of these

Ans: (b)

77. Efficiency of a d.c. shunt generator is maximum when

a) Stray losses are equal to copper losses
b) Magnetic losses are equal to mechanical losses
c) Armature copper losses are equal to constant losses
d) Field copper losses are equal to constant losses

Ans: (c)

78. Copper loss in armature of d.c. generator accounts for

a) 0 - 10% of full load losses
b) 10 -20% of full load losses
c) 20 – 30% of full load losses
d) 30 – 40 % of full load losses

Ans: (d)

79. Constant losses of a d.c. generator are defined as

a) Stray losses
b) Field losses of shunt generator
c) Armature losses of a compound generator
d) Both (b) and (c)

Ans: (d)

80. Equalizer ring in the lap winding of d.c. generator are used to

a) Avoid overhang
b) Avoid noise
c) Avoid harmonics
d) Avoid unequal distribution of current at brushes

Ans: (d)

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