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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 both A and B
 flux(φ)
 armature current(Ia)

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  no resistance is connected.
  any one of the connection.
  series.
  parallel.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2.5Hz
 1 Hz
 50Hz
 2HZ

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from supply.
  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  constant.
  maximum.
  variable.
  minimum.

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Electrical Machines
A DC series motor must started on no load because it would

  Run at dangerously high speed.
 Not develop starting torque.
 Draw more current without producing sufficient torque.
 Fail to start without load.

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