Aux 1 Unit 14 Q1

1 / 10

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

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

A) To regulate the generator's voltage output

C) To measure the generator's frequency

2 / 10

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

B) Voltage relay

D) Power factor meter

A) Under/over-frequency relay

C) Ammeter

3 / 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?

A) Loss of excitation relay

C) Frequency regulator

D) Synchronoscope

B) Overload relay

4 / 10

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

B) Reverse power relay

D) Circuit breaker

A) Under-voltage relay

C) Overcurrent relay

5 / 10

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

A) To measure the voltage output

D) To increase the generator's power output

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

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

6 / 10

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

D) To synchronize the generator with other units

A) To increase the generator's power output

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

C) To measure the generator's efficiency

7 / 10

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

D) To increase the generator's load capacity

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

A) To adjust the generator's voltage output

8 / 10

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

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

D) To synchronize the generator with the grid

A) To increase the generator's output power

B) To measure the load on the generator

9 / 10

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

A) Reverse power relay

D) Wattmeter

C) Circuit breaker

B) Under-voltage relay

10 / 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?

B) Voltage regulator

C) Frequency meter

D) Synchronizing lamp

A) Overcurrent relay

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