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3. Define the functions "if" and translate the sentences into Ukrainian.

1. To locate target on the surface of the sea or on the ground, it is necessary to determine not only in which direction it lies, but also exactly how far away it is.

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2. It does not mean that in all the applications of induction heating only the surface of the body is heated.

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3. A new science, radio astronomy has emerged it is very closely allied to astronomy, astro-physics and physics.

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4. There are no new radio techniques for investigating comets directly, but their close relation to meteors makes it desirable to describe their main features.

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5. It is the gas turbine aero engine, which has been responsible for the revolution in aircraft.

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6. The sailors found it difficult to wash off this ash and soon after they were suffering from the first symptoms of radiation sickness.

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7. It is well known for the diagnosis and treatment of many diseases.

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4. Make up the questions of all types to the texts.

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Черкаський політехнічний технікум

Тексти та завдання для ІІІ курсу спеціальності ЕА

Підготувала викладач Кудрява О.В.

Unit 6. CONTROL DEVICES

Text A

GENERAL CHARACTERISTICS OF CONTROL DEVICES

(Part 1)

The driver's interaction with most mechanical systems in a car is through some sort of control device. And usually, the device being controlled performs the same way each time the control is operated. The steering wheel is one example. Although the end effect is to cause the front wheels of the car to change their angle to some degree or other, the driver’s input is always the same — he turns the steering wheel, a little or a lot, and the front wheels respond accordingly.

In an automotive electrical system, control devices can be placed in three main groups —switches, solenoids and relays, and rheostats.

Switches are used to turn circuits on or off. Most switches are intended to be operated directly and consciously by the vehicle’s occupants — the headlamp or radio switch, for instance. Others are operated by the occupants only as the consequence of performing some other action. Door-jamb dome-lamp switches are good examples. The switches are operated indirectly by opening and closing a car door.

Still other switches are operated by conditions in a car and may or may not come under human influence. For example, the park switch inside a windshield-wiper motor is operated by a cam inside the motor housing.

Solenoids and relays automatically activate electrical devices or secondary circuits, either as a result of some action taken by the driver or by changing conditions in the car. For instance, the solenoid for the starter motor is activated when the ignition switch is turned on to start the car.

Rheostats control the amount of resistance in a circuit, thereby controlling the amount of current fed to an electrical component. The dimmer control for instrument-panel illumination is an example.