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.
The normal structure of an induction motor consists of a cylindrical rotor carrying the secondary winding in slots on its outer periphery & an encircling annular core of laminated steel carrying the primary winding in slots on its inner periphery.
б) Для каждого из следующих трех предложений выберите правильное продолжение или начало, мысленно обращаясь к тек-сту данного задания.
1. An induction motor is simply: a) the primary & secondary structure; b) an electric transformer; c) a motor in which a rotating field system is excited by means of direct current.
2.... is produced by the electromagnetic forces in proportion to the power thus transferred across the air gap by induction: a) a magnetic flux; b) an opposing currept; c) relative motion between the primary & secondary structures, .v
3. The normal structure of an induction motor consists of: a) a: cylindrical rotor & an encircling annulSj core of laminated steel; b) an encircling annular core of laminated steel; c) two relatively movable portions.
в) Учитывая контекст, восстановите в памяти пропущенные слова, затем запишите их на прозрачной пленке, наложенной на текст. Проверьте себя. Укажите количество правильно записанных слов.
An induction motor is ... an electric transformer whose ... circuit is separated by ... air gap into two ... movable portions, one carrying ... primary & the other the ... windings. A-c supplied to the ... winding from an electric ... system produces a magnetic ... & induces an opposing ... in the secondary winding, ... the latter is short-circuited ... closed through an external impedance. Relative motion between the ... & secondary structures is ... by the electromagnetic force ... proportion to the power thus ... across the air gap... induction.
г) Письменно переведите текст.
Задания на расширение лексико-грамматического материала основного текста
37. / 18 мин./ Парно-групповая работа. Используя знания и умения, приобретенные при выполнении заданий, обсудите тему “Асинхронные двигатели”. Осветите, в частности, следующие вопросы: а) принцип действия, 60 преимущества по сравнению с двигателями постоянного тока, в) их недостатки, г) предметное значение слова “асинхронный”.
38. / 10 мищ/ Прочтите и постарайтесь понять толкование следующих понятий. Используйте словарь.
1. Reactance: The compound of the impedance of an a.c. circuit which is due to inductance or capacitance in the circuit.
2. Impedance: The ratio of the r.m.s. /root mean square/ value of the voltage applied to an electric circuit, to the current flowing in the circuit.
