Aux 1 Unit 14 Q1

1 / 10

Why is a reverse power relay important when generators are operated in parallel?

C) To measure the generator's frequency

A) To regulate the generator's voltage output

B) To prevent a generator from consuming power instead of supplying it, which could lead to mechanical damage or inefficiency

D) To synchronize the generator with the grid

2 / 10

Which device on a main distribution switchboard is used to protect a.c. generators from overload by tripping the generator offline if the current exceeds a preset value?

D) Synchronizing lamp

C) Frequency meter

A) Overcurrent relay

B) Voltage regulator

3 / 10

Why is an under/over-frequency relay critical in protecting a generator?

D) To increase the generator's load capacity

A) To adjust the generator's voltage output

C) To measure the current flow in the generator

B) To ensure the generator operates within the correct frequency range, preventing damage to the generator and connected equipment due to incorrect frequency

4 / 10

What device is used to detect and protect a generator from reverse power flow when operating in parallel with other generators?

D) Wattmeter

A) Reverse power relay

B) Under-voltage relay

C) Circuit breaker

5 / 10

Which device is used on the switchboard to automatically disconnect the generator if the frequency deviates significantly from the nominal value?

D) Power factor meter

B) Voltage relay

C) Ammeter

A) Under/over-frequency relay

6 / 10

Why is an overcurrent relay needed on a main distribution switchboard for a.c. generators?

A) To measure the voltage output

C) To protect the generator from damage by disconnecting it in case of excessive current flow, which could cause overheating or damage to windings

D) To increase the generator's power output

B) To prevent the generator from operating at a frequency too high

7 / 10

What device is used to protect a generator from low voltage situations that could result in inefficient operation or damage to electrical equipment?

D) Circuit breaker

A) Under-voltage relay

B) Reverse power relay

C) Overcurrent relay

8 / 10

What is the purpose of the loss of excitation relay in generator protection?

A) To increase the generator's output power

D) To synchronize the generator with the grid

B) To measure the load on the generator

C) To protect the generator by disconnecting it if the excitation is lost, preventing uncontrolled operation and potential damage

9 / 10

Which switchboard device is responsible for disconnecting the generator in the event of a loss of field excitation, thereby preventing damage due to uncontrolled generator operation?

B) Overload relay

C) Frequency regulator

A) Loss of excitation relay

D) Synchronoscope

10 / 10

Why is an under-voltage relay necessary on a generator's main distribution switchboard?

B) To protect the generator and connected equipment from operating under low voltage conditions, which can cause inefficient operation and potential damage

D) To synchronize the generator with other units

C) To measure the generator's efficiency

A) To increase the generator's power output

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