Insert the preposition where necessary

 

of (x8), in(x4), with (x4), inside, from(x2), to(x3), for(x4), into(x2), up(x2), on, instead of, by, after

 

FIRE EXTINGUSHER

 

The body __ the extinguisher consist __ a high – pressure steel bottle, tested __ pressure __ 225 kg/sq. sm. __ its top the bottle is provided __ a valve __ a ring. __ the bottle there is a siphon pipe. __ the valve __ the outlet a rubber hose leads, ending __ a nozzle and a tapering outlet tube. A handle __ holding the extinguisher and a safety-device built __ the valve make __ the whole extinguisher. Smaller extinguishers are provided __ a hanger, the larger ones have a flange (base) pressed __ the bottom part __ placing the extinguisher __ the ground. The automobile-type extinguishers have __ __

 

the hose, a stiff metal tube __ a nozzle __ an outlet tube fixed __ the valve body __ means __ a joint.

 

The capacity __ the extinguishers is __ 1.5 kg (automobile-type extinguishers) __ 6 kg __ liquid carbon dioxide. If the extinguisher contains

 

22

__ more than 80 % __ its charge, it can be used further __ sealing. If more than 20 % __ the initial filling have been discharged, the extinguisher must be filled __.

 

Translate the sentences. Рay special attention to the adjectives in Comparative and Superlative degrees.

 

1. Foam is not as efficient as water in extinguishing class A fires.

 

2. Water is still the most efficient and the cheapest method of extinguishing fires of general nature.

 

3. Chlorine is the most common and most important of the halogens.

 

4. If the fire is larger than can be extinguished by a hand extinguisher, hose reels are used.

 

5. This method is as efficient as the one used by the fire department.

 

6. When the rooms suddenly burst into flames the firefighters were forced to get through the nearest window to escape.

 

7. Insulated ceiling and walls conduct less heat, therefore more heat is going back to the burning room, causing a flashover to occur sooner.

 

8. The richer is the atmosphere in oxygen the quicker combustion process may occur.

 

9. The soda – acid extinguisher is no longer in common use.

 

Fill in the gaps with the proper form of the adjectives (or the adverb).

 

1. Vaporizing liquids are ___ (heavy) than most other liquids.

 

2. Hose lines are of ___ (little) value if they are not advanced to the seat of the fire during the initial attack.

 

3. Personal hazards are probably ___ (serious) of all common fire hazards.

 

4. Despite all technological progress water is still ___ (effective) extinguishing agent for class A fires.

 

5. Water is ___ (cheap) and ___ (available) than any other extinguishing agents.

 

6. If ___ (much) water is applied than required it will bring ___ (much) damage to the property of the burning room.

 

7. Potassium and calcium are used in industry but not as ___ (widely) as the light metals.

 

8. The ___ (great) the molecular velocity, the ___ (high) is the temperature of the body.

 

9. Being ___ (heavy) than air, carbon dioxide replaces the air above the fire and smothers it.

 

10. The ___ (good) extinguishing medium, the ___ (quick) can any fire be extinguished.

 

23

SPEECH PRACTICE EXERCISES