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The quantities needed to complete retardation test are/is _________

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The quantities needed to complete retardation test are/is _________

(a) dw/dt and moment of inertia

(b) dw/dt

(c) current

(d) any of the mentioned

I have been asked this question in my homework.

My question is from Efficiency and Testing of DC Machines in portion DC Machines of Electrical Machines

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Correct option is (a) dw/dt and moment of inertia

For explanation I would say: We need the angular acceleration and the moment of inertia of the machine.

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