Вариант № 5

Задание 1.

Перепишите следующие предложения. Определите по грамматическим признакам, какой частью речи являются слова, оформленные окончанием -s, и какую функцию это окончание выполняет, т.е. служит ли оно:

- показателем 3-го лица единственного числа в Present Indefinite;

- признаком множественного числа имени существительного;

- показателем притяжательного падежа имени существительного.

Переведите предложения на русский язык

1) Last year we repaired our plant’s equipment.

2) What moves the coil and the pointer?

3) Electromagnets have wide application.

Задание 2.

Перепишите следующие предложения и переведите их, обращая внимание на особенности перевода на русский язык определений, выраженных именем существительным.

1) A current flow produces some effects.

2) In that case a battery has a large voltage output.

3) When the current flow is decreased, the magnetic lines of force again cut the wire.

Задание 3.

Перепишите следующие предложения, содержащие разные формы сравнения, и переведите их на русский язык.

1) The most con­venient way to change a.c. to d.c. is by means of a rectifier.

2) The more experiments we carry out, the more data we obtain.

3) This meter is about three times as sharp as that one.

Задание 4.

Перепишите и письменно переведите предложения на русский язык, обращая внимание на перевод неопределенных и отрицательных местоимений.

1) Are there any cells connected in series?

2) There are some models of diesel engines in that laboratory.

3) We used no very special devices to measure the value of resistance.

Задание 5.

Перепишите следующие предложения, определите в них видовременные формы глаголов и укажите их инфинитив; переведите предложения на русский язык.

1) The radio station informed us about bad weather condition in the North Sea.

2) The real training of an electrical engineer begins on board ship.

3) Two parallel conductors forming an electric circuit will have a comparatively small self-inductance.

Задание 6.

Перепишите и письменно переведите первые 2 абзаца текста.

Types of Inductance

An electric circuit, in which an e.m.f. is induced while a current is changing in this circuit, is called an inductive circuit and this circuit has, self-inductance. So the circuit, in which a change of current causes an e.m.f. to be induced within the circuit itself, possesses inductance or self-inductance. Self-inductance is the ability of a circuit to produce an e.m.f. in the same circuit in which the current is changing. Self-inductance is caused by variations in the magnetic field up by the varying current itself. Two parallel conductors forming an electric circuit will have a comparatively small self-inductance. But a solenoid will have a large self-inductance since there will be a considerable magnetic field linked with the solenoid.

When the e.m.f. is induced into a circuit by a change of flux, or in other wоrds when the e.m.f. is produced by a current changing in an adjacent circuit, this property of a circuit is called mutual inductance.

Mutual inductance is the property of a circuit to produce an e.m.f. in a near-by circuit by induction when the current in the first circuit changes. The second circuit can also induce an e.m.f. in the first when the current in the second changes. Mutual inductance is the ability not only of the circuits but of coils as well. Mutual inductance is the common property of two associated electric circuits or two coils and is the same in both directions.

Both self-inductance and mutual inductance occur only when there is a change in current.

Задание 7.

Ответьте письменно на следующие вопросы:

1. When is an e.m.f. induced in a circuit?

2. What is self-induction?

3. What is self-inductance caused by?

4. What is mutual inductance?

5. When do two coils have mutual inductance?

6. Due to what is an e.m.f. induced in one of the two paral­lel coils?

Задание 8.

Ответьте письменно, правдиво ли следующее утверждение? Если нет, то почему:

Only mutual inductance occurs when there is a change in current.