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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  all of below.
  less cost.
  less maintenance.
  simple in construction.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant supply voltage V, starting torque Tst decreases
None of these
 constant V, Tst increases
 either of these

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Electrical Machines
The inertia constant H of a synchronous condenser is

  none of these.
 equal to that of the effective length of the line.
 greater than that of turbo alternator.
 greater than that of hydro generator.

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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 lap-winding ?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²
 PZL/4SP²

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate and the speed rises.
 deteriorate and the speed falls.
 improve and the speed falls.
 improve and the speed rises.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Copper losses
 Eddy current losses
 Both 1 and 2

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