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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

  Fibre.
 Silicon steel.
 Mild steel.
 Cast iron.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P
 T∝ P³
 T is independent of P
 T∝ P²

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Bush bearings.
  Cast iron bearings.
  Ball bearings.
None of these

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.
  P = 20, s = 3.33 %.
  P = 40, s = 5.79 %.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 0o.
 less than 90o.
 Greater than 90o.
 90o.

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

  load.
  speed and voltage.
  voltage.
 speed.

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