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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 conduction.
  convection.
All of these
 radiation.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 series field connections.
 shunt field connections.
 armature connections.
 armature or field connections.

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 eddy current torque.
 no torque.
 damping torqe.
 both 1 and 2.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

  10 %.
 15 %.
 25 %.
 50 %.

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux distorts the main field flux.
 Armature flux weakens the main field flux.
  Both option B and C.
 None of the options.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 equal to that of second transformer.
 none of these.
  more than that of second transformer.
 less than that of second transformer.

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