A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

44.47 Amp.

43 Amp.

29 Amp.

33.33 Amp.

44.47 Amp.

43 Amp.

29 Amp.

33.33 Amp.

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

Ward Leonard control.

None of above.

Rheostatic control.

Any of above method.

Ward Leonard control.

None of above.

Rheostatic control.

Any of above method.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Any where between 75 % and 90 %.

Around 100 %.

Less than 50 %

Around 90 %

Any where between 75 % and 90 %.

Around 100 %.

Less than 50 %

Around 90 %

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Electrical Machines
Interpoles in a DC motor must be

Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.

Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.

Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.

Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.

Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.

Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.

Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.

Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

Change of supply frequency.

Change of number of pole.

Change of supply voltage.

Change of rotor resistance.

Change of supply frequency.

Change of number of pole.

Change of supply voltage.

Change of rotor resistance.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

0.573.

0.649.

0.512.

0.443.

0.573.

0.649.

0.512.

0.443.

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Electrical Machines

Electrical Machines A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

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

Electrical Machines In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Electrical Machines Interpoles in a DC motor must be

Electrical Machines Which of the following methods of speed control is not affected through stator side?

Electrical Machines A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

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

Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Electrical Machines
Interpoles in a DC motor must be

Electrical Machines
Which of the following methods of speed control is not affected through stator side?

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.