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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at normal speed.
 run at lower speed.
 burn.

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 86.91 V.
 76.91 V.
  66.91 V.
 56.91 V.

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  lighter in weight.
  of low resistivity.
  cheaper in cost.
  easy to cast owing to its low melting point and is easily available.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these
 power factor and dc excitation at constant load
 power factor and supply voltage during hunting
 supply voltage and field current at constant excitation

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Electrical Machines
Lap winding is prefered for which type of machines?

 low current and high voltage
 low current and low voltage
 high current and low voltage
 high current and high voltage

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with armature resistance.
 DC series motor.
 DC shunt motor with field weaking control.
 DC compound motor.

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