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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?

 20°
 60°
 18°
 30°

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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
 2, 4, 5
 1 , 3, 5
 2, 3, 5

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  separately excited.
  cumulatively compounded.
 differentially compounded.
  shunt connected.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
 both 1 and 2
 rotor reactance X
None of these

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
 0.8.
 0.6.
  1.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve starting torque.
  reduce copper loss.
  improve efficiency.
  improve power factor.

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