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Electrical Machines

Electrical Machines
Which of the following will vary the maximum torque?

None of these
 rotor resistance R
 both 1 and 2
 rotor reactance X

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 20V
 200V
 10V
 100V

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Reduce.
 Remain unaltered.
 Increase.
 Oscillate around the normal speed.

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Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Magnetic loss
 Copper loss
 Hysteresis loss

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 220 V.
 150 V.
 280 V.
 240 V.

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Electrical Machines
Series generators are used in which of the following applications?

 Air crafts.
 Arc welding.
All of these
 Used as boosters in dc distribution or transmission.

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