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Electrical Machines

Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  none of these.
  reversed.
  increased.
  modified.

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

 any of the above
 full load
 half load
 no load

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Electrical Machines
In DC machine torque depends on which of the following?

 both A and B
 speed
 armature current (I)
 flux (φ)

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ √P.
 T2 ∝ P3.
 T ∝ P.
 T is independent of P.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 none of above.
 any of above method.
 Ward Leonard control.
 rheostatic control.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 115 V
 230 V
 65 V
 460 V

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