generally applied to so many-gfectrical phenomena; b) using a dry cell directly connected by wires to a small light bulb; c) making possible a vast amount of progress by researchers working to uncover reasons for the differences in physical & chemical properties of solids, liquids & gasses.
9. Выберите эквивалент следующего словосочетания: cold weather operation of the machine.
а) машина работает в холоднующогоду; б) работа машины в условиях холодной погоды; в)ма1иина, приспособленная к работе в холодную погоду.
10. Выберите наиболее точный перевод следующего предложения.
Experimental data were presented in some details & discussed as thoroughly as possible.
а) Экспериментальные данные были представлены достаточно подробно и тщательно обсуждены, б) Экспериментальныедан-ные были представлены подробно и по возможности обсуждены,
в) Экспериментальные данные были представлены достаточно подробно и обсуждены как можно тщательнее.
11. Напишите на английском языке 5 предложений об основах электротехники. Подсчитайте свои результаты по образцу, предложенному в ТЗ 1/стр. 15/.
Unit3
Ship Electric Motors.
Section 1
Тема: “Типы двигателей постоянного тока”.
Грамматический материал:
Повторение существительных, прилагательных и наречий.
Basic Topical Text.
* Types of D-C Motors
1. A d-c motor converts the electrical energy into mechanical energy. A d-c generator may be made to function as a motor by applying a suitable source of direct voltage across the normal output electrical terminals.
2. There are various types of d-c motors, depending on the way the field coils are connected. Each has characteristics that are advantageous under given load conditions.
3. Shunt motors have the field coils connected in parallel with the armature circuit. This type of motor, with constant potential applied, develops variable torque at an essentially constant speed under changing load conditions. Such loads are found in machirteshop drives.
4. Series motors have the field coils connected in series with the armature circuit. This type of motor, with constant potential applied, develops variable,torque but its speed varies widely under changing load conditions. That is, the speed is low under heavy loads, but becomes excessively high under light loads. Series motors
are commonly used to drive electric cranes, hoists, winches, electric trucks.
5. Compound motors have one set of field coils in parallel with the armature circuit, & another set of field coils in series with the armature circuit. This type of motor is a compromise between shunt & series motors. It develops an increased starting torque over that of the shunt motor, & has less variation in speed than the series motor.
