Английский язык. Зайцева И.А. - 22 стр.

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22
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INDUCTIVE CONTROL SYSTEM
For use on busy lines various safety devices are additionally available. One of these is the inductive train
control. Each signal on a section of line equipped with this system has a device which activates the brakes of a
passing train. The locomotive is provided with a ”transmitter” which has an iron-core coil and a condenser.
This oscillating circuit is tuned to 2000 cycles/sec. and is supplied with current from a high-frequency generator
to which the coil of an electromagnet for a relay is connected. The high-frequency generator is driven by an
electric motor or a small steam turbine which also drives a 24-volt direct-current dynamo. A second relay and
two pilot lamps are connected to this dynamo. When the system is in operation, the high-frequency generator
supplies current to the oscillating circuit of the locomotive and to the high-frequency relay, so that the armature
of the latter is attracted by the electromagnet and allows current to flow through the 24-volt direct-current relay.
When thus energized, the relay interrupts a flow of current to the actuating electromagnet of a valve.
The signal beside the railway track is also equipped with an oscillating circuit tuned to 2000 cycles/sec.
When the signal is at “safe”, its oscillating circuit is short-circuited and has no effect on the passing locomotive.
However, if the signal is at “stop” and the train nevertheless fails to stop, the oscillating circuit of the signal will
resonate in tune with that of the passing locomotive and withdraw so much energy from the latter circuit that
the armature of the high-frequency relay is no longer sufficiently strongly attracted by the electromagnet and is
therefore released. This in turn cuts off supply of current to the 24-volt relay, which then likewise (так же)
releases its armature. This completes the electric circuit to the electro-magnet that controls the monitoring
valve. When this happens, the monitoring valve causes the brakes to be applied and the driving motor of the
locomotive to be switched. At the same time, the pilot lamp “a” goes out and the lamp “b” lights up.
Ex. 9. Copy the following words. One word in line doesn’t belong to the group. Cross out the odd
word and explain your choice.
1) a train, a plane, an automobile, a rail car.
2) steam, diesel, electric air.
3) a second, an hour, a mile, a minute.
4) current, voltage, time, resistance.
5) relay, transistor, diode, photo.
6) turbine, motor, generator, electron.
7) a railway, a highway, a runway, a road.
LESSON SEVEN
Ex. 1. Practice the reading of the following words and phrases:
characterized, maintenance, requirement, scaleable, interface, barrier, simultaneously, diagnostic,
diagnosis, failures, guarantee, evaluation, trial, fault, extensive, irregularity, query, snowdrift, flooding;
federal railways authorities, double-track line, multiple-track layout, flashing light, audible alarm,
manual switching device, dual-channel automation system, fibre optic cable, identical function.
Ex. 2. These are the key words to Lesson 7. You are to copy them and memorize their meanings.
Word-box:
level crossing protection system – ограждение переезда светофорами;
a modular design – модульное проектирование;
trial operation – опытная эксплуатация;
track layout – схема пути;
a flashing light - мигающий сигнал;
remote – дистанционный, действующий на расстоянии;
a controller – оператор;
а LED display – светодиодный индикатор;

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