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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 no load
 any of the above
 full load
 half load

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

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
 minimum
All of these
 zero

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Electrical Machines
Crawling in an induction motor is due to

  time harmonics in supply.
  space harmonics produced by winding currents.
  slip ring rotor.
  insufficient starting torque.

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Electrical Machines
The condition for maximum running torque is

 0.5 lagging
 R = S.X
 0.707 lagging
 zero
 unity

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 1, 3
 2, 3
 2, 4
 1, 4

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