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I. The function of a fuse is to protect an electrical circuit from overcurrent by melting and breaking the circuit if the current exceeds a safe level.

Computer Science

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Answer

iii

30000 Pa\text{30000 Pa}

Step-by-step solution

3 steps

Here are the answers to questions 4 and 5:

4. a)

Part i

The function of a fuse is to *protect an electrical circuit from overcurrent by melting and breaking the circuit if the current exceeds a safe level

Part ii

The function of a fusible link is to *act as a sacrificial wire designed to melt and open a circuit in the event of a severe overcurrent or short circuit, protecting the main wiring harness

Part iii

30000 Pa\text{30000 Pa}

The function of an air cleaner is to *filter dust, dirt, and debris from the air entering the engine, preventing wear on internal engine components

4. b) THREE types of air cleaner used in a vehicle engine are:

  • Dry-type (paper element)
  • Oil-bath type
  • Oil-wetted type (foam or gauze)

4. c)

  1. State the formula for pressure.

    P=FAP = \frac{F}{A}

    Where PP is pressure, FF is force, and AA is area.

  2. Substitute the given values into the formula.

    P=15000 N0.5 m2P = \frac{15000 \text{ N}}{0.5 \text{ m}^2}

  3. Calculate the pressure.

    P=30000 PaP = 30000 \text{ Pa}

    The pressure exerted on the piston is 30000 Pa\boxed{\text{30000 Pa}}.

    5. a) FOUR components in an engine lubrication system are:

    • Oil pump
    • Oil filter
    • Oil pan (sump)
    • Oil galleries/passages
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