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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-7

61. Armature magnetic field in a dc generator produces which of the following effect?

a) It demagnetizes or reduces the main flux
b) It cross-magnetizes the main flux
c) It magnetizes or reinforces the main flux
d) Both (a) and (a)

Ans: (d)

62. In a dc generator, the polarity of the interpole is

a) Always N
b) Always S
c) Same as the main pole ahead
d) Same as main pole behind

Ans: (c)

63. In a dc generator, compared to the air gap under field poles, the interpole air gap is made

a) Larger
b) Smaller
c) The same
d) Much smaller

Ans: (a)

64. A dc machine is provided with both interpole winding (IPW) and compensating winding (CPM). With respect to the armature

a) Both IPW and CPW are in parallel
b) Both IPW and CPW are in series
c) IPW is in series and CPW is in parallel
d) IPW is in parallel and CPW is in series

Ans: (b)

65. The function of using compensating winding in dc machines is to neutral-lize the

a) Armature reaction in the interpole zone
b) Armature reacting in the commu-tating zone
c) Armature reaction under the pole faces
d) Cross-magnetizing armature reaction

Ans: (c)

66. Thy yoke of a dc generator is made of cast iron because

a) It is cheaper
b) It completes the magnetic path
c) It gives mechanical protection to the machine
d) All of these

Ans: (d)

67. The conductors of the compensating winding are housed

a) Entirely in the armature slots
b) Entirely in the slots in the pole faces
c) Partly in armature slots and partly in slots in pole faces
d) Around the pole core

Ans: (b)

68. The armature mmf wave from in a dc machine is

a) Pulsating
b) Rectangular
c) Triangular
d) Sinusoidal

Ans: (c)

69. Two dc shunt generators are operating in parallel. If it is desired to shut down one of the generators

a) Its main switch is suddenly opened
b) Its field current is gradually reduced
c) The input to its prime move is suddenly reduced to zero
d) None of these

Ans: (b)

70. Residual magnetism is necessary in

a) Self-excited generator
b) Separately excited generator
c) Both (a) and (b)
d) None of these

Ans: (a)

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