Insulating Materials
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Questions and Answers

Which of the following is a major natural resource used in renewable energy?

  • Solar power (correct)
  • Natural gas
  • Oil
  • Coal

    • Which type of batteries are environmentally friendly because they are made from non-toxic metals?

  • NiMH batteries (correct)
  • Lead-acid batteries
  • Alkaline batteries
  • NiCd batteries

    • Which country has invested heavily in wind power technology?

  • Singapore
  • China
  • Germany (correct)
  • India

    • What is the purpose of earthing in electrical installations?

    <p>To avoid the risk of electric shock</p> Signup and view all the answers

    Which type of current flows in only one direction and has a constant value?

    <p>DC</p> Signup and view all the answers

    What is the function of a cell in an electric circuit?

    <p>To convert chemical energy into electrical energy</p> Signup and view all the answers

    Which of the following is the symbol for a cell?

    <p>A</p> Signup and view all the answers

    What is the difference between a cell and a battery?

    <p>A cell is a single source of electrical energy, while a battery is a combination of cells.</p> Signup and view all the answers

    Which material is commonly used as insulation for heating elements?

    <p>Mica</p> Signup and view all the answers

    What is the purpose of sheathing in a cable?

    <p>To protect against moisture</p> Signup and view all the answers

    What is the function of stranding in a cable?

    <p>To increase flexibility</p> Signup and view all the answers

    How is the size of a cable specified?

    <p>By the number of strands and the diameter of each strand</p> Signup and view all the answers

    Which material is commonly used for making cables?

    <p>Copper</p> Signup and view all the answers

    What is the function of an insulator in a cable?

    <p>To confine a current to the conductor</p> Signup and view all the answers

    What is the main difference between a rewirable fuse and a cartridge fuse?

    <p>The cartridge fuse must be replaced when blown</p> Signup and view all the answers

    What is the purpose of a high-rupturing capacity (HRC) fuse?

    <p>To protect against heavy overload</p> Signup and view all the answers

    Which type of power supply is commonly used in Singapore to distribute electricity directly to higher-powered equipment?

    <p>Three-phase supply</p> Signup and view all the answers

    Which type of battery is rechargeable and has a higher energy density and longer shelf-life compared to zinc-carbon batteries?

    <p>Nickel-Metal Hydride Battery</p> Signup and view all the answers

    Which type of battery has electrodes made of lead dioxide and sponge metallic lead, with a sulphuric acid solution as an electrolyte?

    <p>Lead-Acid Battery</p> Signup and view all the answers

    Which type of battery has a nominal voltage of 3.6 V and is commonly used in digital cameras, watches, and other types of portable electronics?

    <p>Lithium-Ion Battery</p> Signup and view all the answers

    Which of the following is true about using a multimeter to measure resistance?

    <p>The multimeter will give a resistance reading of about 0 Ω if there is continuity</p> Signup and view all the answers

    Before taking a reading with a continuity tester, what should be ensured?

    <p>The circuit to be measured is not live</p> Signup and view all the answers

    What does a socket-outlet polarity tester indicate?

    <p>Wiring connection of the outlet</p> Signup and view all the answers

    What type of electrical quantities can a multimeter measure?

    <p>All of the above</p> Signup and view all the answers

    What does it mean when a multimeter is set to measure resistance?

    <p>The multimeter is checking for continuity in the circuit</p> Signup and view all the answers

    What should be done with the leads of a multimeter when setting it to infinity (∞)?

    <p>The leads should be disconnected</p> Signup and view all the answers

    Which type of protective device is used to protect against overcurrent in a circuit?

    <p>A cartridge fuse</p> Signup and view all the answers

    What is the purpose of a fuse in an electrical circuit?

    <p>To protect against overcurrent</p> Signup and view all the answers

    What is the main difference between a rewirable fuse and a cartridge fuse?

    <p>A rewirable fuse can be easily replaced, while a cartridge fuse cannot</p> Signup and view all the answers

    What is the function of a residual current circuit breaker (RCCB) in an electrical circuit?

    <p>To provide a path for the earth leakage current</p> Signup and view all the answers

    Which type of fault occurs when the live (phase) terminal touches the exposed metallic part, causing the metallic part to become live and potentially leading to an electric shock?

    <p>Earth fault</p> Signup and view all the answers

    What is the purpose of a residual current circuit breaker (RCCB) in an electrical installation?

    <p>To prevent earth faults</p> Signup and view all the answers

    What is the main difference between an overload current and a fault current?

    <p>An overload current is caused by adding too many electrical loads to a circuit, while a fault current is caused by a short circuit.</p> Signup and view all the answers

    What is the purpose of a fuse in a circuit?

    <p>To prevent overcurrent faults</p> Signup and view all the answers

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