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Electrical Machines

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

 half load
 no load
 full load
 any of the above

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 any of the above
 greater than
 equal to
 less than

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 920 RPM
 940 RPM
 960 RPM
 970 RPM

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 70° to 85°
 0°
 25° to 30°
 90°

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 any of the above.
 lagging power factor.
 unity power factor.
 leading power factor.

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Electrical Machines
Lamination of core are generally made of

 cast iron.
 stainless steel.
 silicon steel.
 carbon.

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