Aux 2 Unit 5 Quiz 5

Correct Answer:
B) The generator's output voltage may remain low, leading to unstable operation

Explanation:
If the excitation system fails to respond, the generator may not provide enough magnetic field strength to support the load, causing a sustained voltage drop and potential instability.

Correct Answer:
B) By controlling the excitation current to adjust the magnetic field strength

Explanation:
The voltage regulator in the generator system adjusts the excitation current, which alters the strength of the magnetic field and ensures that the output voltage remains constant under changing load conditions.

Correct Answer:
C) The generator cannot supply the immediate power demand without adjusting excitation

Explanation:
The sudden increase in load requires more current, which initially causes the voltage to dip until the excitation system compensates by boosting the magnetic field strength to restore voltage.

Correct Answer:
C) It regulates the field current to maintain output voltage

Explanation:
The AVR adjusts the field current to strengthen or weaken the magnetic field as needed, stabilizing the output voltage after a sudden load application.

Correct Answer:
B) The excitation system increases the field current

Explanation:
To maintain steady-state voltage, the generator’s excitation system boosts the field current, strengthening the magnetic field and allowing the generator to supply the required power and stabilize the voltage.

Correct Answer:
B) It gradually returns to the original steady-state voltage level

Explanation:
After the initial drop, the excitation system adjusts to increase the field current, which brings the output voltage back to the original steady-state level to meet the load demand.

Correct Answer:
C) The voltage drops temporarily due to the increased current draw

Explanation:
When a sudden large load is applied, the initial response of the AC generator is a temporary drop in output voltage. This occurs because the generator's response to the increased current draw takes time, and the excitation system has to adjust to stabilize the voltage.