In a rectified DC diesel electric plant, raising the AC generator's field excitation current will have what effect on the DC propulsion motor?
• Generator field excitation vs terminal voltage in an AC synchronous generator feeding a rectifier • Effect of DC armature voltage on the speed of a DC propulsion motor at a given load • Difference between DC motor behavior and AC power factor concepts
• If you raise the field excitation of the AC generator, what normally happens to the generator’s output voltage when the speed and load are held roughly constant? • After rectification, if the DC supply voltage to the propulsion motor changes, how does that affect the speed of a DC motor whose field is unchanged and load is similar? • Look at the answer choices: which ones talk about motor speed, and which ones talk about an AC characteristic that doesn’t really belong to a DC propulsion motor’s operation?
• Confirm that increased field excitation on a synchronous generator (at constant speed) tends to raise terminal voltage for a given load • Confirm that for a DC motor, at essentially constant field flux, speed is roughly proportional to applied armature voltage • Verify that power factor is an AC-side concept, while the propulsion motor in the question is DC, fed from a rectified source
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