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Quiz· 10 questions

Quiz: trace the power path

10 questions: the parts of a DG set, the order of events after a power cut, and the path of power in a wiring diagram. Name the highlighted part.

In the diagram questions, one part is highlighted with a ?: say what it is. Even if you answer wrong, you’ll see the right answer and the reason straight away.

Questions

  1. 1/10In what order does energy change form in a DG set?
    Show answer

    Correct answer: Diesel → engine → alternator → control panel → load. The engine burns diesel and turns, the alternator makes electricity, and the power goes from the panel to the load.

  2. 2/10What is the highlighted part?
    Picture of a DG set: on one frame, an engine on the left, a round machine in the middle, and a panel and a small box on the right. The highlighted part, marked with ?: the long, round part in the middle, joined by a shaft to the big box on the left.LOAD
    Show answer

    Correct answer: Alternator. The alternator is coupled to the engine by a shaft, and this is where the electricity is made.

  3. 3/10What is the highlighted part?
    Picture of a DG set: on one frame, an engine on the left, a round machine in the middle, and a panel and a small box on the right. The highlighted part, marked with ?: the small box on the frame at the bottom right, marked plus and minus on top.LOAD
    Show answer

    Correct answer: Battery. The battery starts the engine through the starter motor and powers the panel.

  4. 4/10What is this highlighted part with meters and buttons?
    Picture of a DG set: on one frame, an engine on the left, a round machine in the middle, and a panel and a small box on the right. The highlighted part, marked with ?: the box on a stand at the top right, with round meter dials and buttons.LOAD
    Show answer

    Correct answer: Control panel. The control panel is the DG's dashboard: voltage, current, frequency and alarms.

  5. 5/10What is this highlighted part between the mains, the DG and the building?
    Picture: a power pole at the top left, a generator at the bottom left, a panel in the middle, and a building on the right. The highlighted part, marked with ?: the box in the middle, with a switch inside that picks one of two wires.
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    Correct answer: AMF panel. The AMF panel decides whether the load gets its power from the mains or from the DG.

  6. 6/10What is the right order of events after a power cut?
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    Correct answer: Mains fails → DG starts → voltage settles → load on the DG. First the mains fails, then the AMF starts the DG, and only when the voltage and frequency are right does the load move to the DG.

  7. 7/10Which component is highlighted in the circuit?
    Circuit diagram: a round symbol on the left, two symbols on the top wire, a round symbol on the right, a wire returning along the bottom, and a symbol at the bottom right. The highlighted part, marked with ?: the first symbol on the top wire, a small, long rectangle with the wire running through its middle.LNE
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    Correct answer: Fuse / MCB. Protection comes first on the phase: a fuse or MCB, which breaks the circuit when too much current flows.

  8. 8/10Which component is highlighted in the circuit?
    Circuit diagram: a round symbol on the left, two symbols on the top wire, a round symbol on the right, a wire returning along the bottom, and a symbol at the bottom right. The highlighted part, marked with ?: the second symbol on the top wire, two dots with a slanted bar between them.LNE
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    Correct answer: Switch. A switch makes or breaks the path. At OFF, the lamp goes out.

  9. 9/10What is this highlighted wire running from the lamp back to the supply?
    Circuit diagram: a round symbol on the left, two symbols on the top wire, a round symbol on the right, a wire returning along the bottom, and a symbol at the bottom right. The highlighted part, marked with ?: the bottom wire, going down on the right and back left to the supply.LNE
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    Correct answer: Neutral (N). The neutral brings current back from the load to the supply, which completes the circuit.

  10. 10/10What is this highlighted part at the bottom right?
    Circuit diagram: a round symbol on the left, two symbols on the top wire, a round symbol on the right, a wire returning along the bottom, and a symbol at the bottom right. The highlighted part, marked with ?: at the bottom right, three horizontal lines, each shorter than the one above, under a vertical line.LNE
    Show answer

    Correct answer: Earth (E). Earth connects the metal body to the ground. Normally no current flows in it, only during a fault.