A 1.000 kW turbogenerator with a cooling temperature of 269 °C – close to absolute zero – has been made and tested in our country. In power engineering we have been building larger and larger capacity generators because they are more economical. We have 800.000 kW generators in serial production in our country; at the Elektrosila Association they are testing a 1.200.000 kW generator, and have even begun thinking about a 2.000.000 kW generator.
But you cannot go on increasing size indefinitely, for with size you must also increase structural strength, and eventually you reach a point when you simply cannot do it. Increasing the loading is no better, for this soon leads to overheating. That's where the cryogenic generator comes in. The steel rotor of a conventional turbo generator, which can weigh upwards of 100 tons, is replaced in the cryogenic generator by a revolving vessel of 770 mm diameter, at present the largest in the world, in which a coil of niobium-titanium alloy is mounted and kept at a temperature of – 269 °C by liquid helium.
In this cosmic cold, the windings acquire the amazing property of superconductivity – they have no resistance to current and so do not heat up, while generating a very large magnetic flux.
The efficiency can thus be raised to 99,3 per cent, and a unit capacity of more than 5 million kW may well be within our reach.
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1. а) Tim was very exhausted. He tried keeping his eyes open, but he couldn't
b) James needed to borrow some money. He tried
to ask his best friend, but he was short of money, too.
c) Kids tried to put
the fireout but didn't succeed. Finally,someone called the firebrigade.
d) Kate rang the doorbell, but nobody answered. Then she tried
to knock on the door, but there was still nothing.
e) .A baby tried to
reach the toy on the table, but he wasn't tall enough.
f) Could you leave my room for some time? I'm trying to concentrate
2.
а)Our grandparents aren't able to look after themselves anymore. They need looking after.
b) Your hair is getting too long. It needs to cut
c) There is no need
in ironing my skirt. It looks nice and doesn't need
d) My coat is dirty. It needs cleaning
e) We worked hard and need a rest now. We want to
go away to a warm country for a short break.
Объяснение
ответ:3 Прочитайте ситуации и напишите предложения, как в примере. Используйте эти глаголы: потерять перерыв идти вверх сократить улучшить
Пример: Майк ищет свой кошелек. Он не может его найти и очень нервничает. - Он потерял это.
1. Маргарет не может ходить, и ее нога в гипсе. Это очень больно. 2. Английский у Марии был не очень хороший. Теперь это намного лучше. 3. У Тима в месяце не было шрама на щеке. Теперь у него есть шрам. 4. Этим утром я ожидал письма. Теперь у меня есть это. 5. На неделе штраф в автобусе был 6 $. Сейчас это 10 $.
Объяснение: