КОНТРОЛЬНАЯ РАБОТА - Вариант № 9

1. Прочитайте и переведите весь текст. Перепишите и письменно переведите 1, и 2 абзацы текста.

THE ECONOMIZER

1. The economizer is a feed-water heater in which flue gases are used as a heating medium. It is interposed between the boiler and the stack. The water is pumped through the economizer on its way to the boiler. The gases leaving the boiler pass through the economizer before going to the stack. The heat absorbed by the water in passing through the economizer would otherwise be lost. Economizers reduce the losses to a minimum.

2. An economizer consists of a series of tubes through which feed water flows, surrounded on the outside by the hot gases. Present practice is to make the economizer an all-steel unit. The tubes are rolled into the headers. When headers are not employed, return bends, usually connected by flange joints to the straight run of tubing, are used. The steel tubes range from 1 to 2 in. in diameter. The ratio of boiler to economizer heating surface is about 2 to 1.

3. Economizers are parallel or counterflow-parallel when the gases and water flow in the same direction; counterflow when they flow in opposite directions. The counterflow is considered to be the more effective, resulting in a greater heat transfer. In the counterflow, the gases leaving the boiler enter the economizer at the end from which the water makes its exit.

2. Ответьте на вопросы по тексту.

1). What is the economizer used for?

2). Where is the economizer interposed?

3). What does the economizer consist of?

4). How are economizers classified according to their gas and water flow?

3. Найдите в тексте английские эквиваленты к следующим словам и выражениям:

1) подогреватель питательной воды;

2) топочные газы;

3) в качестве греющей среды;

4) дымовая труба;

5) фланцевые соединения;

6) теплопередача;

7) обратное колено трубы;

8) противоток;

9) стальной узел;

10) поверхность нагрева экономайзера.

4. Найдите в предложениях подлежащее и сказуемое, подчеркните одной и двумя чертами соответственно, определите время и залог. Переведите.

1). The water is pumped through the economizer on its way to the boiler.

2). Economizers reduce the losses to a minimum.

3). An economizer consists of a series of tubes through which feed water flows.

4). The ratio of boiler to economizer heating surface is about 2 to 1.

5). The tubes are rolled into the headers.

5. Образуйте от глаголов, данных ниже, Причастие I и Причастие II. Переведите:

- to use - to make

- to interpose - to connect

- to leave - to flow

- to pump - to lose

- to absorb - to transfer

6. Вы хотите поступить на работу механиком на судне. Напишите, какие вопросы Вы бы задали судовладельцу.