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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2.5Hz
 2HZ
 50Hz

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.4.
  1.2.
 1.8.
 1.5.

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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

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

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Slip speed
None of these
 Zero
 Synchronous speed

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 both armature current Ia and speed ωm increase
 Ia remains constant but ωm increase
 both decrese
 Ia increases and ωm decreses

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Electrical Machines
At stand still condition the value of slip is

 0
 1
 finite value
 infinite value

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