31. /4 мин./ Закончите следующие предложения.
1. In general, a-c motors are less expensive than ... 2. Some types of a-c motors do not employ ... 3. A-c motors are manufactured in many different ... 4. In induction motors the rotor currents are supplied by ... 5. The rotor is not connected electrically to ...
32. /6 мин./ Переведите следующие предложения, обращая внимание на значение “term”, “in terms of”.
1. The ampere is defined in terms of the amount of charge per second which passes a point, or through a path. 2. When we write a voltage equation employing Kirchhoff’s voltage law, we must adhere to one convention for the algebraic signs of the terms. 3. A magnet produced by rubbing with a lodestone would be weak in terms of modern magnets. 4. The text runs in the following terms. 5. Most scientists use the term in the sense given here. 6. All these agencies produce a condition termed ionization.
33. /3 мин./ Прочтите следующий текст и скажите по-английски, что такое аварийный и временный аварийный /малый/ источники электроэнергии.
Emergency source of electrical power is a source of electrical power intended to supply essential consumers on-board ship in case the voltage disappears from the main switchboard.
Emergency short-time source of electrical power is a source of electrical power intended to supply essential consumers on board ship from the moment the voltage disappears from the main source of power supply until the emergency diesel generator starts running.
34. /4 мин./ Работа в парах. Обсудите тему “Судовые аварийные источники электроэнергии ”.
35. / 5 мин./ Найдите в основном тексте 35 интернациональных слов. Прочтите их вслух и переведите. >!
36. / 45 мин./ а) Ознакомьтесь со следующим текстом с целью понять его общее содержание. Зафиксируйте начало и окон-; чание выполнения задания.
An Induction Motor
An induction motor is simply an electric transformer whose magnetic circuit is separated by an air gap into two relatively movable portions, one carrying the primary & the other the secondary windings. Alternating current supplied to the primary winding from an electric power system produces a magnetic flux & induces an opposing current in the secondary winding, when the latter is short-circuited or closed through an external impedance. Relative motion between the primary & secondary structures is produced by the electromagnetic force in proportion to the power thus transferred; across the air gap by induction.
