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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 1.5KW
 0.5Kw
 3KW

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Same in both induction motors.
 Squirrel cage induction motor.
None of these
 Slip ring induction motor.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 above rated speed
 both 1 and 2
 below rated speed
None of these

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Electrical Machines
Methods of synchronizing of alternator may be done by

 all bright lamp method.
  all of these.
 all dark lamp method.
 one dark two bright.

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Electrical Machines
Swinburne's test is applicable to

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

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

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