Английский язык. Писарева Л.П. - 6 стр.

                                       3 КУРС.

КОНТРОЛЬНАЯ РАБОТА № 3.

Грамматический материал который необходимо повторить студенту перед
выполнением контрольной работы:
1. Времена PRESENT, PAST, FUTURE, (SIMPLE, CONTINUOUS, PERFECT),
ACTIVE, PASSIVE.
2. Причастия (PARTICIPLE I & PARTICIPLE II );
3. Простые неличные формы глагола.
4. Структура вопросительных предложений в англ.яз.
Для защиты контрольной работы необходимо знать:
1. лексический минимум, предлагаемый к контрольной работе;
2. описание конструкции двигателя текста контрольной работы.

                                     ВАРИАНТ 1

Burmeister and Wain Engines. General Information.
The present B. and W. marine engines are all exhaust turbo charged, the power output
of which is one- third more than that of the corresponding normally aspirated engines
for the same number of revolutions per minute. The reduction of fuel consumption with
a turbo charged engine is of 3 per cent.
       The engine is a single- acting, two- stroke cycle, exhaust poppet- valve type and
finds a wide application all over the world. The design is a true crosshead engine, i.e.
one in which the crankcase is completely separated from the cylinder. Scavenging air
enters the cylinder through a row of ports located in the lower part of the liner. The
scavenge air is given a swirling motion. The exhaust gases are expelled through the
poppet valve centrally arranged in the cylinder cover.
       The structural components of the engine type consist of the bedplate, "A" frame
and scavenging air receiver. These together form a rigid longitudinal girder which
supports the cylinder units. For engines of cast iron construction, vertical mild steel
through- bolts are provided. They extend from the top of the cooling water jackets to
the bottom of the bed plate cross girders. The crankshaft may be fully- built or semi-
built depending on the number of cylinders and torsional vibration characteristics of the
system. The main bearing steel shells are lined with white metal, the bearing keeps are
of cast steel. The connecting rod bottom-end top-end bearings, also the cross- head
shoes, are of cast steel lined with white metal. There are two camshafts. One operates
the fuel injection pumps, the other actuates the exhaust valves through cams, rollers,
roller guides, push rods and rockers.
       A fuel injection pump is provided for each cylinder and it's cam- operated
through a roller and roller guide from a camshaft.
       The cylinder covers are made of chrome – molybdenum cast steel and are bolted
to the cooling water jackets. The liners are of very simple design made of alloy cast
iron. Two fuel valves, a starting valve, a safety and exhaust valves are arranged in the
cylinder cover. The cylinder covers, c. liners and exhaust valves are fresh water
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