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Electrical Machines

Electrical Machines
DC machine windings are

 full pitched
 either of these
None of these
 short pitched

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
 supply voltage control
All of these
 armature circuit resistance control

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Electrical Machines
Equalizer rings are used in which of the followings?

 both 1 and 2
None of these
 lap winding
 wave winding

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 65 V
 230 V
 115 V

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Electrical Machines
Swinburne's test is applicable to

 DC Shunt motor.
 DC series motor.
 DC compound motor.
 DC shunt and level Compound motor.

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

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

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