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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 25° to 30°
 70° to 85°
 0°

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  0.3 mg of KOH / gm.
 0.5 mg of KOH / gm.
  1 mg of KOH / gm.
 2 mg of KOH / gm.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thicker.
  thinner.
  sipper.
  rotor can not have any laminations.

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary short circuited.
 auto transformer.
None of these
 two winding transformer with secondary open circuited.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  maximum.
  minimum.
  constant.
  variable.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 more and maximum torque decreases
 more and maximum torque remains constant
 less and maximum torque decreases

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