Discussion
The output of a dc motor depends mainly on
Answer: A
The key gives speed and torque as what the output of a dc motor depends on. The output of a motor is its mechanical power, which is the product of the torque developed on the shaft and the speed, and the output power in watts is torque times angular speed. The back emf is proportional to the speed and the flux, and it governs how much current the armature draws, but it is an internal quantity of the motor and is not itself the output. The applied voltage and the load resistance are electrical factors on the input side, and a motor load is not described by a load resistance. The answer is speed and torque.
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