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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 0 Hz
 100 Hz
 50 Hz

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 B - C - A or C - A - B.
  A - C - B.
 C - A - B.
 B - C - A.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 speed regulation.
 running torque.
 starting torque.
 efficiency.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KW.
 Power drawn in KVA.
 Gross power.
 Output power at the shaft.

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 above rated speed.
 in both direction.
 below rated speed.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1500 rpm
 1000 rpm
 750 rpm
 3000 rpm

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