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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

All of these
 DC machine
 Synchronous machine
 Induction machine

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 0°
 70° to 85°
 90°

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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

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

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Capacitor run.
  Repulsion.
  Universal.
  Split phase.

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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
 Zero
 15.6 Nm

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The speed of motor.
 None of above.
 The voltage across the terminals.
 The torque required.

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