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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 decreases.
 remains same.
None of these
 increases.

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

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

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 over compound generator
 shunt generator
 both B and C
 series generators

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Electrical Machines
Damper winding is used to

 both 1 and 2.
 increase the load current.
 suppress the hunting.
 decrease the load current.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 100W
 500W
 1000W
 3000W

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of main winding.
All of these
 reversing the terminals of starting winding.

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