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Electrical Machines

Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3%
 +3%
 -3.33%
 +3.33%

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Shunt field resistance control.
 Armature voltage control.
 Armature resistance control.
 Any of above.

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

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

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 3 at 90°C.
 2 at 90°C.
  1 at 90°C.
 0.5 at 90°C.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  0.54.
 0.7.
  1.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 decreases.
 remains constant.
 increases.

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