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Electrical Machines

Electrical Machines
The torque developed in IM is nearly proportional to

 1 / V2.
  V.
  V2.
  1 / V.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 Zero
 15.6 Nm
 16.55 Nm
 15.28 Nm

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Electrical Machines
DC shunt motors are suitable for

 Lathes.
 Blowers and fans.
 Centrifugal pumps
  All of this.

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

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

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 shunt field
 both A and B
 none of above
 armature circuit

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at over load.
 copper loss at half load.
  copper loss at any load.
 copper loss at full load.

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