2. Перепишите и переведите предложения и определите, верны ли они (напишите «true», если предложение верно, и «false»если ононеверно):

   1. The «broken» circuit means the same as the «opened»one.

   2. To provide a complete path along which the electrons travel you must close the circuit.

   3. The short circuit which can return current to the source of supply is veryuseful.

   4. A current is unable to flow in a circuit consisting of metallic wiresalone.

3. Найдите в тексте производные от следующих слов, выпишите их, переведите на русский язык и укажите частьречи.

To differ, to conduct, to connect, safe, to follow, to generate

4. Напишите следующие предложения на левой странице тетради, их русский перевод−на правой. В каждом предложении подчеркните глагол- сказуемое, определите его видовременную форму изалог.

   1. Three flights were made, the first from Toulouse direct toSingapore.

   2. All of the ground-based navigation aids are rapidly being supplemented by satellite-based aids like Global PositioningSystem.

   3. Magnetism is an invisible force, the ultimate nature of which has not been fully determined.

   4. Recently the model has been modified and is now being used in many practical situations.

5. Напишите следующие предложения на левой странице тетради, подчеркните в каждом из них инфинитив и определите его функцию. На правой странице напишите переводпредложений.

   1. To prevent icing, many pitot tubes are equipped with a heatingelement.

   2. Attitude heading and reference system is designed to replace traditional mechanical gyroscopic flight instruments and provide superior reliability and accuracy.

   3. The system’s ability to correct itself can be diminished during prolonged periods ofturbulence.

   4. To flow through a short conductor is certainly easier for the current than through a long one.

   5. It is important to know how a charge is distributed on anobject.

6. Перепишите следующие предложения на левой странице тетради, подчеркните в каждом из них причастия (Participle I, II) и определите их функции. На правой странице напишите переводпредложений.

1. The instrument indicating the altitude of the aircraft above the ground is called altimeter.

2. Bright white landing lights are usually fitted to most planes for enhanced visibility during the landingapproach.

3. While parked at the gate, the A340 electrical system can be powered by dual ground-power receptacles near the nose gear of theaircraft.

4. An aircraft flying at the speed of sound is flying at Mach1.0.

5. Aircraft heading may be determined using a magnetic direction sensing device such as a magnetometer or a magnetic fluxvalve.

Контрольная работа № 4 (4)

1. Письменно переведите следующий текст. Английский текст перепишите на левой странице тетради, русский перевод−направой.

Current is defined as increment of electrons. The unit for measuring current was named in honor of A.M. Ampere, the French physicist. Thus it is called ampere. The symbol for current is I. The electric current is a quantity of electrons flowing in a circuit per second of time. The electrons move along the circuit because the e.m.f. drives them. The current is directly proportional to the e. m. f. The e.m.f. is measurable and it is the volt that is the unit used for measuring it. A current is unable to flow in a circuit consisting of metallic wires alone. A source of an e.m.f. should be provided as well. The source under consideration may be a cell or a battery, a generator, a thermocouple or a photocell,etc.

A steam of electrons in a circuit will develop a magnetic field around the conductor along which the electrons are moving. The strength of the magnetic field depends upon the current strength along the conductor. The direction of the field is dependent upon the direction of thecurrent.

If the force causing the electron flow changes its direction periodically the current is called alternative (a. c.). The electrons leave one terminal of the power supply, flow out along the conductor, stop, and then flow back toward the same terminal. A voltage that caused current reverses its polarity periodically. This is properly called an alternating voltage. The power supply that provides the alternating voltage actually reverses the polarity of its terminals according to a fixed periodic pattern. A given terminal will be negative for a specific period of time and drive electrons out through the circuit. Then, the same terminal becomes positive and attracts electrons back from the circuit. This voltage source cannot be a battery. It must consist of some types of rotatingmachinery.