Контрольная работа по "Английскому языку"

1. Переведите предложения в косвенную речь

1. You can see all models at the exhibition and then we will meet and discuss our contract

He offered we could see all models at the exhibition and then we would meet and discuss our contract

1. I am beginning a new work tomorrow

   He said he would begin a new work the next day

1. Did your son get up late yesterday?

  He asked if my son got up late the day before?

1. Send us your machines as soon as possible,please

  He asked us to send machines as soon as possible

1. We must get the results of your research today

  He said they had to get the results of my research that day

1. What principle is fuse protection is based on?

 He asked what principle was fuse protection was based on

1. They may also be used without insultation

They said they might also been used without insultation

2. Составьте 2 вопроса к каждому предложению

1. Transmission lines are interconnected in switching stations or at the generating stations

a) Transmission lines are interconnected in switching stations or at the generating stations,aren’t they?

b)What units are interconnected in switching stations or at the generating stations?

2. Water rotates the turbine shaft

a)What does rotate the turbine shaft

b) What does  water rotate?

3. Large industrial areas with cities are supplied from electric networks fed by electric power plants

a) Where are large industrial areas with cities can get electric power?

b) Who are consumers of electric power in cities?

2. Переведите текст.

Power Generation.

Generation of electrical power is a process whereby energy is transformed into an electrical form. There are several different transformational processes, among which are chemical, photo-voltaic, and electromechanical. Electromechanical energy conversion is used in converting from coal, petroleum, natural gas, uranium, water flow, and wind into electrical energy. Of these, all except the wind energy conversion process take advantage of synchronous AC generator coupled to a steam, gas or hydro turbine such that the turbine converts steam, gas or water flow into rotational energy, and the synchronous generator then converts the rotational energy of the turbine into electrical energy. It is the turbine-generator conversion that is by far most economical and consequently most common in the industry today.

The AC synchronous machine is the most common technology for generating electrical energy. It is called  synchronous because the composite magnetic field produced by three stator windings rotate at the same speed as the magnetic field produced by the field winding on the rotor. A simplified circuit model is used to analyze steady-state operating conditions for a synchronous machine. The phase diagram is an effective tool for visualizing the relationship between internal voltage, armature current, and terminal voltage. The excitation control system is used on synchronous machines to regulate terminal voltage ,and the turbine-governor system is used to regulate the speed of the machine.

The operating costs of generating electrical energy are determined by the fuel cost and the efficiency of the power station. The efficiency depends on generation level and can be obtained from the heat rate curve .We may also obtain the incremental cots curve from the heat rate curve. Economic dispatch is the process of allocating the required load demand between the available generation units such that the cost of operation is minimized.

Электроэнергетика

Производство электрической энергии – это процесс, при котором энергия трансформируется в электрическую энергию. Существует несколько переходных процессов, среди которых выделяют химический, фотоэлектрический и электро-механический. В переработке электромеханической энергии используется превращение энергии из угля, нефти, природного газа, урана, силы потоков воды и ветра в электроэнергию. Все эти способы переработки, кроме энергии ветра используют генератор переменного тока в сочетании с паровой, газовой и водяной турбиной ,генератор переменного тока превращает энергию вращения турбин в электрическую энергию .Этот турбогенератоный процесс переработки наиболее экономически выгоден и наиболее распространен в промышленности.

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