3. A power grid can only transmit and transform electric power each other but cannot regulate
each other.(wrong)
4. The positive effects of the closed-loop operation of power grid are formed by two
elements.(right)
5. The closed-loop operation can not raise the quality of voltage.(wrong) 6. Phase and its order cannot be uniform. (wrong)
7. The variety of elements in a loop network is not overloaded.(right) 8. The voltages of different lines must be limited in a scope.(right) 9. The stable state must meet many specified requirements.(right)
10. The relaying control can not always meet the satisfaction of closed-loop operating mode.
（wrong）
Passage 3 Types of circuit breaker
The high voltage circuit breaker is mainly composed of contactors, are-extinguishing elements, insulation material, operating mechanism. The insulation 1. Contactors, are-extinguishing elements, insulation material and operating mechanism form
the high voltage circuit breaker.(right)
2. The insulation structure is made up of 3 parts.(right)
3. The are-extinguishing medium can be divided into only 3 parts.(wrong)
4. An oil circuit breaker means a circuit breaker with oil as are-extinguishing and
insulation medium.(right)
5. A vacuum circuit breaker is not a circuit breaker with close and open contactors in high
vacuum.(wrong)
6. A pure SF6 gas is not a food are-extinguishing medium.(wrong)
7. The insulation strength of SF6 gas is higher than air and vacuum.(right) 8. An oil minimum circuit breaker is very safe in use.(right)
9. An oil minimum circuit breaker has bad heat dissipation capability.(wrong)
10. An oil minimum circuit breaker is one of the mostly used circuit breakers in the power
grid.(right)
Passage 4 Grounding of electric equipment
Connecting electric equipment with a grounded conductor in the earth is called grounding. The grounding modes of electric equipments include working grounding, 1. Grounding is based on the connection of electric equipment with a ground conductor.(Right) 2. The grounding modes are formed by 4 kinds of grounding. (wrong)
3. Working grounding is used to ensure the safe operation of electric equipment(right) 4. The resistance value for working grounding should be between 0.3Ωto 12Ω(wrong) 5. The lightning protection grounding should be more than 30Ω(wrong)
6. The lightning protection grounding is used to lead lightning current to ground safely
and reliably.(right)
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7. The lightning protection grounding is also used to reduce the potential rise caused by
the lightning current. (right) 8. A protective ground is to make the outer shell of electric equipment reliably by connecting
the grounding conductor with a ground wire(right) 9. A grounding resistance for protective ground should be more than 10Ω if possible.(wrong) 10. The passage is about 3 groundings of electric equipment.(right)
Passage 5 Optical fiber communication 100
Optical fiber communication is a kind of information communication by optical fiber. In power system, the composite optical fiber ground wire ground wire or OPGW is widely 1. A kind of information communication is optical fiber communication.(right) 2. The composite optical fiber ground wire is seldom used in power system.(wrong)
3. One of the transmission tasks of the optical fiber main network is to transmit
administration telephones from power system.(right)
4. Optical fiber communication has been the important communication method in power
communication system.(right)
5. Large capacity of communication is not one of the advantages of optical fiber
communication.(wrong)
6. The communication capacity of optical fiber is indirectly proportion to the carrier
frequency.(wrong)
7. The carrier frequency of power line is more than 300kHz.(right)
8. The carrier frequency of microwave is between 3000Mha and 5000MHz.(wrong)
9. The main problem of the fiber-optic channel is the high price of fiber-optic
equipment(right)
10. The cables made by optical fiber are not expensive.(wrong)
Passage 6 Power plant
According to the mode of energy conversion, power plants can be classified into fossil-fired, hydraulic, nuclear, wind, solar, geothermal and tide power plants and so 1. Base on energy conversion, power plants are divided into more than 7 categories.(right ) 2. A power plant tries to transform energy source into electric power. (wrong )
3. The power plant generating electricity and supplying steam is called a co-generation
plant. (right )
4. A power net plan for short and medium term is one of factors in selecting a site (wrong) 5. Two important factors for a new plant plan are fuel supply and ash disposal.(right) 6. Environmental protection is less considered in building a new power plant(wrong) 7. Water sources and transportation conditions are not needed to consider in selecting a
new site(wrong)
8. The total capacity in a newly scheduled plant arranges from 1200MW to 3600MW(right) 9. The number of units exceeds more than six.(wrong)
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10. The ranks of capacity should be limited within two.(right)
Passage 7 Selection of metal material for the boiler in units of 1000MW grade
Taking a general view of the 1000MW grade high-efficiency supercritical unit designed and made in China, the temperature of main steam and reheated steam are 1. The 1000MW grade high-efficiency supercritical unit is designed and made in China.(right) 2. The temperature of main steam and reheated steam reach basically between 570 to
650℃.(wrong)
3. The tube wall temperature of superheater and reheater can reach more than 600 to 650 ℃
(right)
4. The anti-high temperature steam oxidation performance at tube inner surface is highly
demanded.(right)
5. The anti-high temperature flue gas corrosion performance at tube outside surface is not
highly demanded.(wrong)
6. The temperature limit of T91 for use is about 593℃（right） 7. The temperature limit of T92 for use is less than 620℃（wrong）
8. The temperature of austenite stainless steel for normal use is about 650℃（right） 9. The temperature limit of austenite stainless steel is less than 700℃（wrong） 10. Only heat-resisting steel can be adopted for use.(wrong)
Passage 8 The role of the condenser
The condenser is a surface heat exchanger in which cooling water passing through the tubes removes the vaporization heat from the exhaust steam which is passing over
1. A condenser is a heat exchanger removing the vaporization heat from the exhaust steam
and condensing the exhaust steam into water.(right)
2. It is suggested that the water should not be cooled below the saturation temperature.( right) 3. The saturation temperature would not remove excess energy from the system and reduce the
overall efficiency.( wrong)
4. It is unnecessary to reduce the steam to water so that it can be pumped back through the
system.( wrong)
5. The condenser does not control back-pressure at the turbine exhaust.(wrong)
6. The important factor controlling the turbine backpressure is the temperature of the
cooling water passing through the condenser tubes.(right)
oo
7. The temperature of cooling water will increase its temperature between 15F and 20F as
it passes through the condenser.(right)
8. The terminal difference means the temperature difference between the cooling water and
the turbine exhaust steam.(right)
9. The temperature increase of the cooling water and the terminal difference depend on 3
factors.(wrong)
10. The exhaust steam temperature does not rely on the temperature of the cooling water which
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enters the condenser.(wrong)
Passage 9 Hydraulic structure (P288)
The selected type dam of hydraulic power plant depends principally on topographic, geologic, hydrologic, climatic conditions, constructional materials, lay out plan, cost 1. The type of dam for hydraulic power plant depends on many factors.(right) 2. The main purpose of the dam safety monitoring is to monitor the performance indexs.(right) 3. The equipment installed inside the dam is to discover the normality of dam in time.(wrong) 4. Horizontal displacement is more important than vertical displacement.(wrong) 5. Temperature stress and strain are the two main monitoring items of dam.(wrong) 6. The monitoring method is the suitable points on the dam and its foundation.(right) 7. Some monitoring devices are movable for periodical supervision.(wrong)
8. The monitoring result result shall be analyzed and studied by computers.(wrong)
Passage 10 Heat treatment(P288)
The purpose of post-weld heat treatment is: to diminish the residual stress in the welded joints; to improve the organization and property of the welded joints. 1. The post-weld heat treatments have two main purposes.(right)
2. One of the purposes is to diminish the residual stress in the welded joints.(right) 3. The other purpose is to improve the organization of the welded joints.(wrong) 4. The welding crack can be classified into 5 categories.(right)
5. To change the internal structure of the work piece is one of purposes for heat
treatment.(right)
6. There are 5 kinds of steel heat treatment.(wrong)
7. The processes of heat treatment include 4 procedures.(right) 8. The electric resistance furnace is not widely used.(wrong)
9. Heat treatment furnaces are not composed of electric resistance furnace, combustion
furnace and surface heating device.(wrong)
10. The control device for heat treatment temperature is composed of temperature measuring
element, and control device.(wrong)
Passage 11 Business and risks(P290)
Marx once quoted a famous saying in his work capitalism, “once ther’s appropriate profit, capital will become bold. For 10% profit, it will guarantee its being fully 1. The work Capitalism is written by Carl Marx.(right) 2. For 20% profit, capital will take risks.(wrong)
3. For 100%, capital dares to break any human laws.(right)
4. For 200%, capital dares to commit any crime and even risks being hanged. (wrong) 5. The pursuit of profits forces human beings to take any risks.(right)
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6. The pursuit of profit is much more encouraged than the pursuit of friendship.(wrong) 7. There are two ownerships existing in Chinese economy.(right)
8. Only bright manufacturer or manager can predict the future of his enterprises.(wrong)
Passage12 Electricity(P290)
Electricity may be dangerous. It always takes the shortest way to the ground. So it needs to find something like metal or water to carry it to the ground. These things are 1. Electricity is not dangerous as people think.(wrong) 2. Dry wood can carry electricity to the ground. u(wrong)
3. Conductors like metal or water can carry electricity to the ground.(right) 4. Human body is a good conductor because it has 90% water in the body.(wrong) 5. You can use a hairdryer far from bath and water.(right)
6. Wet hands are good conductors for transmitting electricity.(Right) 7. The best tool to push a shocked person away from the power is to use a non-conductor.(right)
Passage 13 Paper
Do you know the key to the following question? How much paper is used every year? Maybe it’s a little difficult for you. Let’s look at some figure. In 1900 the world 1. Paper was invented and made in ancient China.(right)
2. An ancient Chinese found that the best paper could be made from trees.(wrong)
3. America, Canada, Sweden and Japan became the most important countries in paper
making.(wrong)
4. 50% of paper is used for publishing books and magazines. (right)
5. Much more paper use means more and more forests will be cut down.(right ) 6. It is time we saved paper and forests.(tight)
Passage 14 Undersea Life (P291)
The undersea world is very mysterious. In the daytime, there is enough light. Under the sea, everything is blue and green. Today scuba diving is a new sport and many 1. Everything under the sea becomes blue and green. (right)
2. Now people can dive into the water to explore the secrets of the sea.(right)
3. You can stay in deep blue sea for a long time if you have bottles of air on your back.
(right)
4. It is warm but dark in deeper water. (wrong)
5. Under about 3000 feet, there is no light at all. (right)
6. Many fish under deep water have eyes like normal fish in water. (wrong ) 7. The sea is a dangerous place for all organisms.(right)
8. Deep sea animals must follow the rule: to eat or be eaten.(right)
Passage 15 Advice on Friendship(P292)
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