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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 45.
 30.
  270.
 180.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 stator of a dc machine.
 rotor of a dc machine.
 stator of a induction machine.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 1, 4,5
 1 , 3, 5
 2, 3, 5
 2, 4, 5

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
 0.3.
  0.54.
  1.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero , - 50 rpm.
 zero, 950 rpm.
 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.

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

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

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