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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-11

101. The hunting in synchronous machines can be guarded against by

a) Using a flywheel
b) Designing the synchronous machine with suitable synchronizing power
c) Damped bars
d) All of these

Ans: (d)

102. Main disadvantage of using short-pitch winding in alternators is that it

a) Reduces harmonics in the generated voltage
b) Reduces the total voltage around the armature coils
c) Produces a symmetry in the three phase windings
d) Increases Cu of end connections

Ans: (b)

103. One turn consists of

a) Two coilsides
b) Two conductors
c) Four conductors
d) Four coilsides

Ans: (b)

104. Main advantage of distributing the winding in slots is to

a) Add mechanical strength to the winding
b) Reduce the amount of copper required
c) Reduce the harmonics in the generated e.m.f.
d) Reduce the size of the machine.

Ans: (c)

105. In synchronous generator operating at zero pf lagging, the effect of armature reacting is

a) Demagnetizing
b) Magnetizing
c) Cross-magnetizing
d) Both magnetizing and cross-magnetizing.

Ans: (a)

106. The regulating of an alternator is

a) The reduction in terminal voltage when alternator is loaded
b) The variation of terminal voltage under the conditions of maximum and minimum
excitation
c) The increase in terminal voltage when load is thrown off
d) The change in terminal voltage from lagging power factor to leading power factor.

Ans: (c)

107. The advantage of a short pitch winding is

a) Low noise
b) Increased inductance
c) Suppression of harmonics
d) Reduced eddy currents.

Ans: (c)

108. If the machines are running in synchronism and the voltage of one machine is suddenly increased

a) The machines will burn
b) Both machines will stop
c) Synchronising torque will be produced to restore further synchronism
d) None of these

Ans: (c)

109. Maximum current that can be supplied by an alternator depends on

a) Speed of the exciter
b) Number of poles
c) Exciter current
d) Strength of the magnetic field.

Ans: (d)

110. Advantage of using short pitched windings in an alternator is that it

a) Improves cooling by better circulation of air.
b) Saves copper use in windings
c) Reduces the total voltage around the armature coils
d) Suppresses the harmonics in generated emf

Ans: (c)

111. When an alternator is running on no load, the power supplied by the prime mover is mainly consumed

a) To meet iron losses
b) To meet copper losses
c) To meet all no load losses
d) To produce induced emf in armature winding.

Ans: (c)

112.Two alternators are running in parallel. If the field on one of the alternator is adjusted, it will

a) Change its frequency.
b) Change its power
c) Change its load
d) Reduce its speed

Ans: (c)

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