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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 40 A.
 440 A.
 44 A.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 same in both methods
 field weakening method
 armature resistance control
None of these

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

None of these
 both 1 and 2
 lap winding
 wave winding

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.5.
 Greater than 1.
 0.25.
 near to 1.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
 Torque and field current.
 Armature current and torque.
  Armature current and field current.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
 Resistance split phase motor
All of these
 Capacitor start motor

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