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Question

The current drawn by a 220V DC series motor of armature resistance 0.50 and back emf 200V is

A
40A
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B
400A
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C
450A
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D
500A
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Solution

The correct option is A 40A
Eb=VtIaRa
where Vt = terminal voltage
Eb = back emf.
Ia = armature current or line current.
Ra = Armature resistance.
Ia=VtEbRa=2202000.5=40A

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