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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  voltage.
  speed and voltage.
  load.

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  250 V.
  very small, say about 2 or 3 V.
 about 100 V.
  zero.

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Electrical Machines
The commutator segments of DC machines are made up of

 copper alloy
 hard-drawn copper
 brass
 copper

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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?

All of these
 BYR
 RBY
 BRY

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Electrical Machines
Hysteresis loss will depends on

 f
 f1.6
 f³
 f²

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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?

 16.55 Nm
 15.28 Nm
 15.6 Nm
 Zero

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