Question: A DC motor is supplied by a 2 0 0 V source, without any mechanical load connected to the shaft, and it reaches a speed

A DC motor is supplied by a 200V source, without any mechanical load
connected to the shaft, and it reaches a speed of 2500rpm. The resistance
is 7. With a load, the speed drops to 1800rpm, and the current becomes
8A.
1. During this second operation, what is the load torque of the machine
and its efficiency?
2. If the machine is to operate at the same speed and torque, but as a
generator, what will be the required terminal voltage?

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