Variant №1 Read and translate the text on specialty in written form

3. Make up a story on the theme: “My native town”.
Key words: my native town, to be born, motherland, streets, parks, avenues, museums, theatres, stadiums, zoo, monuments, schools, university, enterprises, buildings.
Head of the department: Muhammadiyeva. O.


VARIANT № 3
1. Read and translate the text on specialty in written form.
The carburetor.
The mixture consisting of fuel vapor and air burned in the cylinder is produced in the carburetor. It supplies a uniform fuel-air mixture in the ratio 1:15 to 1:16 for the entire engine speed range, i. e, for idling, changeover, partial load and fill load. The fundamental principles of a carburetor are as follows: during the suction stroke outside air is drawn by the flowing through the intake pipe of the carburetor.
When the intake pipe is narrowed at some place, the speed of the induction air will be increased at this place. If a little opening is arranged at the bottle-neck and connected with the fuel supply, fuel will be dragged along from this opening while the air is passing and mixed with the air as finely atomized droplets. Thus quantity of fuel-air mixture fed to the engine and consequently the quantity of fuel is generally metered by a throttle valve incorporated into the induction pipe of the carburetor between carburetor and engine.
By means of selection of the jet bores, the mixing ratio of fuel and air can be maintained sufficiently constant within wide ranges of engine speed and load. A «choke valve» is inserted info air intake passage in front of the main jet. During starting the cold engine, it is closed: as a result, nearly the entire intake pressure is acting on the fuel nozzle and excess in fuel is achieved.
In case of unskilled operation and especially if the choke valve is kept open too long after the the engine has started, the engine may be flooded with fuel to such an extent that it does not ignite. This leads to serious damages of the engine.