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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 Cos α²
 sin (α/2)
 Cos (α/2)

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Electrical Machines
In most condition which frame of motor will be preferred?

 Drip proof.
 Open type.
 Splash proof.
  Totally enclosed fan coiled.

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Electrical Machines
In DC machine torque depends on which of the following?

 speed
 armature current (I)
 both A and B
 flux (φ)

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Electrical Machines
Commonly used starters of cage motor is

  DOL.
  star delta.
  both A and B.
None of these

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Cummulative compound.
 have an equal number of electrons and protons.
 Series shunt.
  Differentical compound.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 440 volt.
 230 volt.
 240 volt.
  220 volt.

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