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Armature current in dc motor will be max...

Armature current in dc motor will be maximum when

A

just started moving

B

picked up maximum speed

C

intermediate speed

D

just been switched off

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The correct Answer is:
A
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(a) An electric motor runs on a d.c. source of emf e and internal resistance r. show that the power output of the source is maximum when the current drawns by the motor is epsilon//2r . (b) Show that power output of electric motor is maximum when the back emf is one-half the source emf provided the resistance of the windings of the motor is negligible. (c) Compare and contrast carefully the situation in this excercise with that in Example 43 above.

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In the above question, show that power output of electri motor is maximum when the back emf is one-half of the sourece emf, provided the resistance of the winding of the motor is negligible .

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  12. In a dc motor if E is the applied emf and e is the back emf then the e...

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  13. Armature current in dc motor will be maximum when

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