B. The electrical power is conducted directly to the rotor through brushes & a Q^nmutator.
C. This motor is a sort of rotating transformer in which a stationary winding is connected to the a-c source, while the other winding receives its power by transformer action while it rotates.
24. / 12 мин./ Отработайте правильное чтение текста со словарем или имитируйте произношение и интонацию диктора на материале основного текста: а) 2-й абзац, следя по книге; б) 1,3,4, не глядя в текст. ^
25. / 3 мин./ Дважды прослушайте/прочтите и запомните диалоги.
1 А: I intend to develop a theory explaining nuclear forces.
B: Is that all? It’s rather ambitious, isn’t it?
A: Ambitious? Naturally. It is the most ambitious project I can think of. You see, I have no time for anything else.
2 A:. Here is the application. Fill it out now, sign it & I’ll present it personally to the committee?
B: There’s something you’ll have to explain to me first.
26. /10 мин./ Поговорите в парах на любую из изученных тем, используя раз.говорньге штампы последних Диалогов. Запишите свой диалог на магнитную пленку.
27. / 9 мин./ Постарайтесь понять содержание следующих предложений. Руководствуясь контекстом, заполните пропуски предлогами, приведенными в конце задания.
1. A great majorjty,... the motors usectaboard ships are designed to operate... a-c. 2. The rotor currents are.supplied ... electromagnetic induction. 3. These emfs’currents establi^i a rotating magnetic field ... the air gap. 4. The induction motor derives its name ... the fact that mutual-induction takes place... the stator & the rotor... operating conditions. 5.... standstill a comparatively high value ... current is taken ... the line. 6. Many shops are equipped ... automatic machinery. 7. The early experiments were carried out... several scientists. 8. We can express these relationships ... the following formula.
a) across b) between c) at d) from e) with f) in terms of g) by
h) of i) under j) on.
28. /3 мин./ Найдите в правой колонке эквивалент каждого предлога/предложного словосочетания из левой колонки. '
а) под,ниже,внизу в)внутри
1) with
2) over
3) in terms of
4) between
5) below, beneath, underneath '
6) through, acros's
7) beyond
8) inside
9) outside
10) past
c) в случае,по отношению к,при наличии
d) после,за,мимо
e) на протяжеии, по всей, по сравнению с
f) вне, за пределы
g) в виде, через; в единицах; в смысле
h) через, сквозь
i) между
j) по ту сторону,за,вне;сверх,выше
29. / 3 мин./ Учитывая контекст и начальные буквы незаконченных слов, заполните пропуски в следующих предложениях.
1. These emf’s currents establish a rotating magnetic f... across the a... g... 2. The stator winding corresponds to the a... winding of a dc motor or to the p... winding of a transformer. 3. The magnetic r... field produced by the stator c... a... the rotor conductors i... a voltage in the conductors. 4. Majority of motors for a marine i... can be of s... type, low in first cost, e... in running, low in m... cost, simple & r..., & r....
30. / 4 мин./ Составьте 3 предложения из следующих наборов
слов.
1. squirrel-cage, winding, design, minimum, practicable, loss, reactance.
2. machine, exert, comparatively, starting torque, standstill, high, value, current, take line.
3. advantage, use, a-c motor, availability, a-c power.
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.
