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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 fibre.
 cast iron.
 mild steel.
 silicon steel.

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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

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

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 all of above.
 high initial cost.
 high maintenance cost.
 poor overall efficiency.

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
 5.46 KW.
 1.644 KW.
  2.73 KW.

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Electrical Machines
_____________ types of induction motor are widely used.

  Single phase IM.
  Slip ring IM.
  Squirrel cage IM.
  Three phase IM.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 83.33 KVA
 123.3 KVA
 50 KVA
 100 KVA

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