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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
In DC machine yoke offers

 produce working flux
 both A and B
 flux path completion
 mechanical protection to the machine

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

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

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
 No load.
  Full load.
 Low load.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC series motor.
 DC shunt motor with field weaking control.
 DC compound motor.
 DC shunt motor with armature resistance.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 45°
 60°
 10°

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MORE MCQ ON Electrical Machines

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