Skip to content
MaritimeTest
Log in

High Voltage, Management on Ships

CBT 53 questions

First 5 of 53 questions — with answers

The correct answer is marked. Unlock the rest to study the whole test, online or offline.

  1. Question 1

    A 3 phase AC generator is supplying a high voltage switchboard at 11 000 Volts, and has a synchronous impedance of 0,5 Ohms. A solid, symmetrical three phase, short circuit occurs at point A. What is the prospective fault current through circuit breaker B1?
    • 22 000 Amps.
    • 11 000 Amps.
    • 5 600 Amps.
    • 2 800 Amps.

  2. Question 2

    A joint between one supply cable conductor and its terminal on a 6,6 kiloVolt electric motor has a resistance of 2 milli-Ohms. If a short circuit current of 20 000 Amps flows through the joint how much heat is generated at the joint?
    • 800 kW.
    • 400 kW.
    • 80 kW.
    • 40 kW.

  3. Question 3

    A man with dry hands accidently touches an electrical conductor at 50 Volts. Which of the following is the most likely result of this?
    • It would hurt, but not kill him.
    • It would kill him.
    • He would not feel it.
    • He would suffer severe burns to his hand.

  4. Question 4

    Can HV sub-station (P) be supplied via the Starboard side of the ring main while the Port side is isolated?
    • Yes, provided the total load on HV sub-station (P) and HV sub-station (S) is reduced below 2 000 kiloWatts.
    • Yes, provided the HV sub-station loads do not increase.
    • Yes, if Generator G2 is run instead of Generator G1.
    • No.

  5. Question 5

    Electrical circuit breakers can protect against a number of types of fault. Which of the following are the faults that can be used to operate a circuit breaker? Tick all that apply:
    • Over current.
    • Over voltage.
    • Reverse power.
    • Low frequency.

Preview — 5 of 53 questions

You are seeing the first 5 questions with answers. Unlock the remaining 48 to study the whole test — online or offline.

About this CBT test

High Voltage, Management on Ships is a CBT test with 53 questions and verified answers. Common topics include: high voltage, electrical equipment, circuit breaker, permit work, prospective fault, relation, main, systems.

You can practise the free questions online — one at a time, with the correct answer — or unlock the whole test and download it to study offline, without internet.

Related CBT tests