Aux 1 Unit 12 Q1

1 / 10

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

D) During power-down procedures

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

A) During normal operation when the load is low

C) When the system is in standby mode

2 / 10

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

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

D) To ensure all equipment starts with a delay

A) To start all equipment simultaneously

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

3 / 10

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

D) To reduce the voltage supplied to all loads

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

A) To disconnect all electrical loads simultaneously

C) To increase the power supply to essential equipment

4 / 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

C) Equipment that has no power requirement

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

5 / 10

In which situation would preferential tripping most likely be activated?

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

A) When the system is operating below capacity

D) When the vessel is docked and not using power

C) During routine maintenance of the electrical system

6 / 10

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

D) To prevent any equipment from operating

C) To decrease the efficiency of the system

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

7 / 10

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

C) The reduction of system voltage during faults

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

D) The ability to disconnect all loads at once

A) The simultaneous tripping of all circuit breakers

8 / 10

Why is discrimination important in an electrical system?

A) It increases the overall power output.

C) It decreases the need for maintenance.

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.

9 / 10

In what scenario is fuse back up protection most critical?

C) When all equipment is running below capacity

D) During routine inspections of the electrical system

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

A) When the electrical load is low

10 / 10

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

A) To prevent the fuse from blowing

C) To increase the current capacity of the fuse

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

D) To reduce the voltage across the fuse

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