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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f
 f³
 f1.6
 f²

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Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 hysteresis loss.
 copper loss.
 eddy current loss.

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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
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 20 volts.
 10 volts.
 30 volts.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 500W
 100W
 3000W
 1000W

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 more and maximum torque remains constant
 less and maximum torque decreases
 more and maximum torque decreases
 less and maximum torque increases

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