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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Питання 1

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 2

How does the cooling of IGCT modules affect their performance?

A Influence thermal resistance and power dissipation capability.

B Affect gate drive voltage requirements.

C Improve short-circuit withstand capability.

D Reduce device size and weight.

Питання 3

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 4

In a PID controller, what does the 'P' term stand for, and what does it control?

A Proportional; it controls the magnitude of the error.

B Process; it controls the system speed.

C Passive; it controls the backup systems.

D Pre-emptive; it anticipates future errors.

Питання 5

What would happen if the integral gain (I) is set too high in a PID controller managing cargo pump speed?

A The system will stabilize more quickly

B The system may exhibit excessive overshoot and become slow to stabilize.

C It will have no effect on system performance.

D The system will respond instantly with no error.

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