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The output of a DC electric machine, whether functioning as a motor or a generator, is determined by several interconnected factors. Below are key determinants:
1. Magnetic Field Strength: For both DC motors and generators, the strength of the magnetic field within which the armature rotates has a significant influence on the output. Increasing the magnetic field strength usually increases the torque in a motor and the generated emf (electromotive force) in a generator.
2. Armature Current: In a DC motor, the output torque is directly proportional to the armature current, meaning higher currents result in greater torque. In generators, the armature current is related to the load and affects the terminal voltage.
3. Speed of Rotation: In DC motors, speed is inversely proportional to the torque for a given power output. In generators, the speed of rotation affects the frequency and amount of the electrical output; higher speeds typically result in higher output voltage.
4. Number of Turns in the Armature Coil: The number of turns in the coil affects the magnitude of induced emf in a generator and the torque in a motor. More turns generally mean a higher voltage output in generators and greater torque in motors, assuming other factors like current remain constant.
5. Load: For a DC generator, the load connected to it significantly influences its output voltage and current. In a DC motor, the load affects its operating speed, current draw, and efficiency.
6. **Efficiency of
Answer: c
Explanation: The dc electric machine output is the product of Total Magnetic loading, Total Electric loading, and speed in rps. Thus the output depends on total loadings.