Английский язык. Арланова Т.Л - 9 стр.

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9
b) Make a list of disadvantages of direct current power supply. Use the text to
help you.
1 causes restrictions in speed
2 __________________
3 _________________
Exercise 6. Describe the process of transmission of electric current to the
railway network system by way of the third rail distribution. Your explanation
will consist of several steps. The verbs will help you.
1 _____________ place
2_____________ connect
3 ______________transform
4 _____________ rectify
5______________turn into
6_______________feed
Exercise 7. Try to guess the meaning of the words in bold type. Check your
answers with a dictionary.
It is a well-known fact that electric trains perform valuable service on trunk
lines with dense traffic. But electric haulage is costly because it needs a
whole system of electrical substations and either a catenary or a conductor
rail. The third rail system is particularly essential for underground railways
because of a limited space available in tunnels.
The conductor rail system proves quite successful under normal
conditions, but a great difficulty arises on open sections. The matter is that
under unfavourable winter conditions the third rail may be covered with ice
and it becomes difficult to transfer electric current from the conductor rail to
the train.
To eliminate this difficulty a special equipment was devised which could
remove ice. At first this equipment was manually operated. But the process
was relatively slow and inefficient.
In recent years, the manually-operated equipment has been converted to
semi-automatic working.
Exercise 8. Define the function of the verb “to have” in the following
sentences, translate into Russian.
1. Every engineer working in the field of signalling has to know the principles
of track circuit operation. 2. Many new electronic devices have been
developed to provide the safety of high-speed traffic. 3. One of the new
systems proposed for carrying passengers in towns is the “Never-Stop”

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