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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 460 V.
 200 V.
 230 V.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BRY
All of these
 RBY
 BYR

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Electrical Machines
In DC generators brushes are used for

 convert ac armature current in to dc
 collecting of voltage
 collecting of current without any sparkings
 reduce eddy current loss

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Synchronous motor.
 DC shunt motor.
 Reluctance motor.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 cumulative compound.
 shunt.
 differential compound.
 series.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Starting torque.
  Full load current.
 Operating speed.
 Starting torque, operating speed, full load current.

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