(Part 2)

The auto fuse was first used in some GM cars in the mid-’70s and is now used on all new GM products. It's finding its way into new vehicles from other manufacturers, as well. These fuses are readily identified by their shape.

The rectangular fuse body is transparent plastic with two metal blade terminals protruding from the back. The top of the fuse is molded to provide an easy finger grip. Two recesses in the top provide a convenient test point, even with the fuse installed. Like the glass fuse, the auto fuse can be visually inspected by viewing the fuse element through the fuse body.

Some advantages to consider:

• Easy to install and remove without tools.

• Easy to visually inspect. Test points are also built in.

• Fuse-amperage ratings are boldly printed on the end, and can be easily read.

• Can be carried or stored without fear of breakage.

These advantages are partially offset by several disadvantages:

• Must be pulled from the fuse panel for visual inspection.

• Require a special fuse block, just be-coming available in the aftermarket. The best source is still a salvage yard.

German can use a variation of the glass-capsule fuse. It has a body of solid ceramic, with the fuse element fitted into a groove on the outside. The element is formed at both ends into cone-shaped metal caps that fit into spring clips in the fuse block. Although the fuse element is readily visible, it’s vulnerable to damage. And, the end caps are prone to oxidation, which can seriously hamper current flow, incidentally, the ceramic-type fuse is color coded for easy reading of amperage rating. Volkswagens typically use 8-amp (white) and 16-amp (red) fuses.

Exercises Unit 7 (text a)

1. Put the phrases in the right order to make up a dialogue

1. I need some information about the use of fuse.

2. They serve to protect different installations against over currents and short-circuits.

3. And what do we get then?

4. Can you help me with this material?

5. Thank you very much for your helping.

6. They are utilized in various circuits, electrical equipment and installations.

7. Fuse protection is based on a very simple principle: in case of a short-circuit or over-current, when the maximum value of current has been exceeded, the fusible link of a fuse is heated to its melting point.

8. Fuses are widely used nowadays as protection devices.

9. Yes, of course. What information do you need?

10. This open the circuit and disconnects the circuit from the power source.

11. Can you explain the principle of work of fuse?

12. What can you say about the function of fuses?

13. Where are fuses utilized?

a) _____ b) ______ c) ______ d) ______ e) ______ f) _______

g) _____ h) _____ i) ______ j) ______ k) ______

2, Fill in the blanks with a suitable word from the list: a) bottom b) removes c) useful d) jacket e) cooled f) passes g) produced

1. Heat is being _______ in the combustion chamber of the engine as the fuel is being burned. Some of this heat goes into ______ power, some is lost through the exhaust gases, and some must be removed by the cooling system of the engine. The cooling system ______ about one-third of the

Черкаський політехнічний технікум

Тексти та завдання для ІІІ курсу спеціальності ЕА

Підготувала викладач Кудрява О.В.

heat produced. The heat _______ through the cylinder walls into the coolant or into the air. The engine temperature must be controlled.

2. An engine equipped with a liquid-cooling system has a water _____ around the cylinder walls and the cylinder head of the engine. The water jacket is connected to the radiator by passages. The engine is _____ by coolant circulating from the water Jacket through the radiator from top to _____ and back through the water jacket from bottom to top. The air flowing past the radiator takes heat from the coolant. The fan keeps a constant flow of air past the radiator and helps in the cooling process.