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When Ea<Vt machine is said to be operating in which of the following mode?

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When Ea<Vt machine is said to be operating in which of the following mode?

(a) Depends on the Shaft speed

(b) Generating

(c) Motoring

(d) Inducing

This question was addressed to me in my homework.

My question is taken from Electromagnetic Power and Circuit Models in section Circuit Model, Emf and Torque of DC Machines

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Correct choice is (c) Motoring

Explanation: The machine operates in motoring mode (puts in electrical power) when Ia is in the direction opposite of induced emf Ea. For the given armature circuit Vt = armature terminal voltage= Ea + Ia * Ra; which implies Vt> Ea.

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