I. Listen to the tape recorder and train the following words:

equipment, quartz, sand, rating, case, link, fault; sim-. pie, faulty, direct, alternating; to serve, to base, to place

II. Translate the words. Mind the prefixes:

to place-to displace-displacement; to charge-to discharge; to move-to remove; to equip-to reequip; movable-removable

III. Translate the word-combinations in writing:

quartz-sand fuse, fusible link, faulty fusible element, faulty protection device

IV. Fill in the verbs "to serve", "to reequip", "to replace":

1. The lab should be ... with modern equipment. 2. This fuse cannot... as a protective element since it is faulty. It should be ... with a new fuse.

V. Have a talk with your groupmate. Use in your answers "certainly", "I suppose", "I don't know":

1. Are fuses common protective devices? 2. Are they utilized in a high-voltage line? 3. Is their construction simple? Is it complex?

VI. Translate the sentences. Mind "both... and", "in case", "up to":

1. Both solid and gaseous insulators are in use nowadays. 2. In case an element gets open it should be replaced by a new one. 3. Capacitors of extremely high capacity (up to 1000 mF) are produced nowadays.

VII. Choose the correct variant:

1. A fuse serves a) as a load, b) as a protection device. 2. Fuses are used a) for d.c. only, b)for both a.c. and d.c.

3. In case of a fault a) the whole fuse should b-. replaced, b) the faulty link should be replaced.

4. Fuse protection is based on a) a simple principle, b a complex principle

VIII. Memorize the questions. Use them in a talk with your groupmate:

1. What does a fuse seive for? 2. For what type of current are fuses used? 3. What should be done in case of a faultu fuse? 4. On what principle is fuse prootection based?

Вправа 1

Дайте відповіді на питання:

• What foreign language do you study at college?

Вправа 2

Прочитайте та перекладіть текст. Знайдіть у тексті речення з неозначеними часовими формами дієслова.

1.3.9 ВИВЧЕННЯ ТЕКСТУ ЗА ФАХОМ

Тема	"Types of Fuses in Use Nowadays"
Граматика	Активний, пасивний стан дієслів. Неозначені часи.

2.9 Types of Fuses

Fuses are used to protect circuits against overcurrents. In case of an overcurrent, the fuse link made of copper, Zink or lead melts and opens the circuit. Zink, lead and their alloys are known to melt at a rather low temperature (200° to 240°C). These metais having a low conductivity, fuse links made their must have a large cross-sectional area. Copper fuse links have a good conductivity, but they melt at a rather high temperature. As to silver fuse links, they are rather expensive and are known to be used at voltages over 1,000 V and low currents. Most commonly, use is made of copper fuse links silvered for protection against oxidation.

There are several types of fuses in use nowadays. Of them, a plug-type fuse has a porcelain container. Fuses of this type are used for voltages up to 380 V and currents up to 60 amp.

As to a sand fuse, it is used for voltages up to 500 V at currents from 100 to 60 amp,

!. Складпгь словник незнайомих сл!в за зразком:

Слово	Транскрипция	Переклад
copper	Cico: роз	мщь

То be made of

То melt

Lead

Alloy

Low conductivity

Cross-sectional area

Good conductivity

High temperature

Fuse link

Overcurrent

Oxidation Plug-type fuse To be expensive Low current Sand Voltage

П. Прочитайте та перекладпъ текст (усно)

III. Дайте в'щповщь на запитання, використовуючи активну лексику урока

1. For what purpose are fuses used?

2. What metals are melt at rather low temperature? Do these metals have a low conductivity?

3. What conductivity have copper fuse links? Are they melt at a rather low temperature?

4. Are silver fuse links expensive? When are they used?

5. What are the wide - spread fuse links?

6. What are the types of fuses use nowadays? For what voltage are they used?

IV. Доповнпъ речения словами зпдно з текстом.

1. metals having a low conductivity.

2. Fuses are used against overcurrents.

3. Copper fuse links have conductivity.

4. has a porcelain container.

5. Sand fuse is used for voltage up to .

6. A plug-type fuse has a __.

■

V. Вкаж!ть час та стан присудка. Переклад^ь речения.

1. There are several types of fuse in use nowadays.

2. Zink, lead are know as the metals with a low conductivity.

3. Sand fuse is used for voltage up to 500 V at current from 100 to 600 amp.

4. Copper fuse links are used at voltage over 1,000 V and low current.