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ELECTRICAL MACHINES

Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

  340 A.
 570 A.
  460 A.
 250 A.

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Shunt motor.
  DC series motor.
  Synchronous motor.
  Separately compound motor.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Speed regulation.
 Running Torque.
 Starting torque.
  Effiency.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
 Draw too much current.
 Open fuse or circuit breaker.
  Develop excessive speed and damage itself.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

  It will run in opposite direction.
 motor will not run.
 motor will become slow.
 It will run in same direction.

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