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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  none of these.
  cage.
  wound.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 higher efficiency.
 low noise.
 reduced starting torque.
  a large starting torque.

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/ 4Sa
 PZL/4Sa²
 PZL/4Sp²
 PZL/4S

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 48 Hz
 50 Hz
 48.5 Hz
 45 HZ

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 near to 1.
 0.5.
 Greater than 1.
 0.25.

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Electrical Machines
What is the effect of armature reaction ?

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

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