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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

 100 Hz
 0 Hz
 25 Hz
 50 Hz

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Oscillate around the normal speed.
  Reduce.
  Remain unaltered.
  Increase.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 57.1%.
 48.0%.
 59.2%.
 88.8%.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are connected.
 Armature and field both are parallel.
 Armature winding is in series with load.
  Armature and field both are in series with the load.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α²
 sin (α/2)
 Cos (α/2)
 Cos α

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

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