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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 sin (α/2)
 Cos α²
 Cos (α/2)

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Separately Excited DC Motor
 DC Shunt Motor
 Compound Wound DC Motor
 DC Series Motor

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same prime mover speed
 same frequency
 same voltage magnitude
 same phase sequence

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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, 3, 5
 1, 4,5
 2, 4, 5
 1 , 3, 5

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 none of these
 machine B
 machine A
 any of the two machines

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 DC compound motor.
 DC series motor.
 Separately excited DC motor.

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