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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 DC.
 AC.
 both of above.
None of these

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

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

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the maintenance and repair
All of these
 increase the iron loss
 increases the design cost

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

All of these
 Stator copper loss
 Rotational loss
 Stator core loss

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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
 45 HZ
 50 Hz
 48.5 Hz

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Electrical Machines
Rotating part of DC motor is known as

 Carbone brush.
 Armature.
 Pole.
 Starter.

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