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Turns Ratio

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How to calculate current drawn by loaded motor?

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Q. A simple electric motor has an armature resistance of

1 Ω

and runs from a d.c. source of

12 V

. It draws a current of

2 A

when unloaded. When a certain load is connected to it, its speed reduces by

10

% of its initial value. The current drawn by the loaded motor is:

An electric motor labelled 5KW is able to raise a load at speed of 25 m/s. Calculate the load being lifted.

Q. The full load slip of 400 V, 3-phase, squirrel cage induction motor is 4%, full load current is circulated when 100 volts is applied between the lines with locked rotor. The necessary tapping on an auto transformer to limit the starting current to 1.5 times the full load current of the motor is _____%.

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Q. If the load current and flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of motor will

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