Aux 1 Unit 12 Q1

1 / 10

What is fuse back up protection designed to do in an electrical system?

B) To provide additional protection in case the fuse fails, ensuring the circuit is still protected from overcurrent

A) To prevent the fuse from blowing

D) To reduce the voltage across the fuse

C) To increase the current capacity of the fuse

2 / 10

What is the primary purpose of preferential tripping in an electrical system?

B) To shed non-essential loads to prevent the complete loss of power when the system is overloaded

C) To increase the power supply to essential equipment

D) To reduce the voltage supplied to all loads

A) To disconnect all electrical loads simultaneously

3 / 10

Why is discrimination important in an electrical system?

A) It increases the overall power output.

D) It ensures that all circuit breakers trip simultaneously.

B) It minimizes the impact of faults by ensuring only the affected circuit is disconnected, reducing downtime and maintaining power to other areas.

C) It decreases the need for maintenance.

4 / 10

In which situation would preferential tripping most likely be activated?

D) When the vessel is docked and not using power

A) When the system is operating below capacity

C) During routine maintenance of the electrical system

B) When the electrical load exceeds the system’s capacity, threatening to overload the generators

5 / 10

When is sequential starting most likely to be used in an electrical system?

C) When the system is in standby mode

D) During power-down procedures

A) During normal operation when the load is low

B) During the start-up phase of multiple large motors or heavy equipment

6 / 10

What does discrimination refer to in the context of electrical protection systems?

C) The reduction of system voltage during faults

D) The ability to disconnect all loads at once

B) The ability of the protection system to isolate a fault by tripping only the circuit breaker closest to the fault, leaving other circuits unaffected

A) The simultaneous tripping of all circuit breakers

7 / 10

In what scenario is fuse back up protection most critical?

D) During routine inspections of the electrical system

C) When all equipment is running below capacity

A) When the electrical load is low

B) When there is a risk of a fuse not operating correctly under a fault condition

8 / 10

Why is it important to identify and manage non-essential consumers in an electrical system?

D) To prevent any equipment from operating

A) To increase the overall load on the system

B) To ensure that critical systems and essential equipment continue to operate during power shortages or overload conditions by shedding non-essential loads

C) To decrease the efficiency of the system

9 / 10

What is the purpose of sequential starting in an electrical system?

A) To start all equipment simultaneously

B) To start electrical equipment in a predetermined order to avoid overloading the power supply

D) To ensure all equipment starts with a delay

C) To reduce the start-up time for all equipment

10 / 10

Which of the following best describes a non-essential consumer in an electrical system?

D) Equipment that is never used

A) Equipment that must remain operational under all conditions

B) Equipment that can be disconnected during an overload or emergency to prioritize essential loads

C) Equipment that has no power requirement

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