Aux 1 Unit 15 Q3

1 / 10

How does a frequency meter indicate that a.c. generators are correctly synchronized?

B) The frequency readings differ significantly

C) The frequency meter reading fluctuates continuously

D) The frequency meter reading is not relevant for synchronization

A) The frequency readings of the generator and the busbar are identical

2 / 10

Which of the following is a key requirement for successful synchronization of a.c. generators?

D) The generators must have different power factors

B) The generators must be operating at the same frequency, voltage, and phase sequence

A) The generators must have different voltages

C) The generators must be of different sizes

3 / 10

Which of the following devices is commonly used to ensure correct synchronization of a.c. generators?

D) Frequency meter

A) Voltmeter

C) Ammeter

B) Synchronoscope

4 / 10

Why is it necessary to synchronize a.c. generators before connecting them in parallel?

B) To ensure that the generators operate at the same frequency, voltage, and phase angle to avoid severe electrical disturbances, equipment damage, or generator tripping

A) To increase the generators' power output

D) To reduce the load on the generators

C) To allow the generators to run at different speeds

5 / 10

What is the primary consequence of connecting two generators in parallel that are out of phase?

D) Reduced noise levels

C) Improved generator performance

B) Severe mechanical and electrical stress, leading to potential damage or failure of the generators

A) Increased fuel efficiency

6 / 10

What is the function of a synchronoscope in the synchronization process?

A) It measures the voltage of the generator

C) It adjusts the generator's frequency

B) It indicates the phase angle and synchronization status between the generator and the busbar

D) It measures the current flow in the generator

7 / 10

What role does synchronization play in maintaining system stability when connecting multiple a.c. generators in parallel?

C) It decreases the system voltage

A) It reduces the number of generators needed

D) It allows the generators to operate independently

B) It ensures that all generators share the load evenly and operate together without causing disruptions in the power system

8 / 10

What is a critical factor to consider regarding the phase angle when synchronizing a.c. generators?

A) The phase angle should be exactly 180 degrees out of phase

D) The phase angle is irrelevant

B) The phase angle should be zero degrees or very close to it to ensure that the generators are in phase, preventing circulating currents and ensuring smooth power transfer

C) The phase angle should be as large as possible

9 / 10

What could happen if a generator is connected in parallel without proper synchronization?

B) The generator may experience out-of-phase conditions, leading to mechanical stress, high circulating currents, and potential damage to both the generator and the power system

A) The generator will operate normally

D) The generator will automatically synchronize itself

C) The generator will reduce its voltage output

10 / 10

How does a synchronoscope indicate that a.c. generators are correctly synchronized?

B) The needle or pointer is stationary and pointing to the 12 o'clock position, indicating that the generators are in phase and ready to be connected

C) The needle or pointer is pointing to the 6 o'clock position

D) The needle or pointer is moving erratically

A) The needle or pointer is rotating rapidly

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