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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 45.
 30.
  270.
 180.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Cumulative compound motor.
  Differential compound motor.
  Shunt motor.
  Series motor.

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
  Series motor.
 Brushless DC motor.
 Shunt motor.

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 230 V.
 150 V.
 210 V
 240 V.

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Electrical Machines
Example of double excited machine is

None of these
 DC Shunt Motor
 Synchronous motor.
 Both are correct.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 90 %
 Around 100 %.
 Any where between 75 % and 90 %.
 Less than 50 %

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