LNG Operations - Engine

Automation Knowledge

You will meet questions for Senior ETO position for LNG carriers. questions would include VFDs, PMS, Electrical Propulsion, sensors, signals, communication of various equipment and troubleshooting.

Питань 20

Час 9 min

Мова Англійська

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Ось кілька прикладів питань з цього тесту. Завантажте додаток GYRO, щоб пройти повний тест.

Питання 1

When does the PMS switch between isochronous and droop modes?

A When the fuel supply decreases

B When the generators are running at full capacity

C When additional generators are brought online or taken offline, requiring smooth load transitions

D When there is more power demand

Питання 2

Why is 4 mA used as the minimum signal level in a 4-20 mA loops?

A To detect wiring faults - broken loop or disconnection.

B To provide more accuracy

C To increase response time of the sensors

D For more precize adjustments

Питання 3

What for Resistive – Capacitive (RC) circuits are used?

A For filtering.

B For shunting.

C For rectifying.

D For amplifying.

Питання 4

Why is tuning a PID controller essential when handling boil-off gas (BOG) on a gas tanker?

A It ensures constant supervision.

B It adjusts system pressure automatically.

C Proper tuning ensures precise control of BOG management, preventing pressure surges and optimizing fuel use.

D It minimizes the need for backup systems

Питання 5

How do VFDs deals with motor heating, voltage spikes, and harmonics in electrical systems?

A By providing soft start/stop functionality to reduce mechanical stress on the motor.

B By incorporating filters and reactors to suppress voltage spikes and harmonics.

C By adjusting motor speed to match load demand, reducing overheating.

D All of the above.

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