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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 30°
 18°
 20°
 60°

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Open slot type machines.
 Semi closed slot type machine.
 Closed slot type machines.
 Any of the above.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Same as full load.
  Equal to 1.
  Low.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 0.5Kw
 1.5KW
 3KW
 2KW

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 1.98
 0.02, 0.98
 0.04, 1.96
 0.04, 0.96

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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

 2, 4, 5
 1 , 3, 5
 1, 4,5
 2, 3, 5

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