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A VLCC（100，000 DWT+）with a 30，000 Shaft Horsepower Steam Turbine is slow to respond to engine movements and has less stopping power than normal ships because it has a ______．
A.Bigger propeller
B.Smaller power weight ratio
C.Smaller propeller
D.Larger power weight ratio
参考答案
更多 “ A VLCC（100，000 DWT+）with a 30，000 Shaft Horsepower Steam Turbine is slow to respond to engine movements and has less stopping power than normal ships because it has a ______．A.Bigger propellerB.Smaller power weight ratioC.Smaller propellerD.Larger power weight ratio ” 相关考题
考题
The word horsepower(马力) was first used two hundred years ago.James Watt had made the first widely used steam(蒸气)engine. He had no way of telling people exactly how powerful it much work one strong horse could do in one minute. He called that unit one horsepower. With this unit he could measure the work his steam engine could do.He discovered that a horse could lift a 3,300-pound weight 10 feet into the air in one minute. His engine could lift a 3,300-pound weight 100 feet in one minute.Because his engine did ten times as much work as the horse, Watt called it a ten horsepower engine.6.The passagesays that Watt made the first widely used steam engine.A.TB.F7.Watt made up a unit of measurement based on the strength of a horse.A.TB.F8.Watt wanted to find a way to lift a 3300-pound weight.A.TB.F9.One horsepower would equal the weight a horse could lift.A.TB.F10.The title of the passageis "How the Term Horsepower Came into Being".A.TB.F
考题
The thermal energy of the steam is converted into ( ) energy by the turbine.
A.electricalB.mechanicalC.chemicalD.potential
考题
Boston Company, an electing S corporation, has an operating loss of $400,000 for the current year. Hank owns a 40% interest in the company and is a material participant. At the beginning of the year, Hank's adjusted basis in the stock is $30,000. During the year the company borrows $100,000 with a recourse note. How much of the loss can Hank deduct on his current-year income tax return?()A.$0B.$30,000C.$70,000D.$160,000E.$200,000
考题
As for turbine oil, contact with water in the form of steam will be inevitable so good______properties will be essentialA.defrostingB.de-oilingC.demulsifyingD.dehumidifying
考题
Which method should be used to warm up the pump turbines prior to discharge ________．A.Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB.Run the pump at high speed with the discharge valves closedC.Run the turbine at slow speed with the pump disconnectedD.Shut the discharge valve and run the pump at slow speed
考题
When planning the loading or discharging of a VLCC（100，000 DWT+）what is the most important consideration ________．A.Draft and trimB.Limits of the bending momentsC.Rate of dischargingD.Rate of loading
考题
What is an advantage of diesel over steam turbine propulsion ________．A.Less fuel consumption per SHPB.Diesel fuel costs less than bunker C or its equivalentC.Less routine maintenance requiredD.Less weight per SHP
考题
Geothermal(地热)Energy
1 Since heat naturally moves from hotter regions to cooler ones, the heat from the earth's center flows outwards towards the surface. In this way, it transfers to the next layer of rock. If the temperature is high enough, some of this rock melts and forms magma(岩浆). The magma ascends in its turn towards the earth's surface. It often remains well below the earth's surface, creating vast areas of hot rock. In such regions, there are deep cracks, which allow rainwater to descend underground. Some of the heated rainwater travels back up to the earth's surface where it will appear as a hot spring. However, if this ascending hot water reaches a layer of impermeable(不可渗透的)rock, it remains trapped, forming a geothermal reservoir. If geothermal reservoirs are close enough to the surface, they can be reached by drilling wells. Hot water and steam shoot up the wells naturally, and can be used to produce electricity in geothermal power plants.
2.A few geothermal power plants depend on dry-stem reservoirs which produce steam but little or no water. In these cases, the steam is piped up directly to provide the power to spin a turbine generator. The first geothermal power plant, constructed at Lardarello in Italy, was of this type, and is still producing electricity today.
3.Most currently operating geothermal power plants are either "flash" steam plants or binary(双重的)plants. Flash plants produce mainly hot water ranging in temperature from 300° to 700°Fahrenheit. This water is passed through one or two separators where released from the pressure of the underground reservoir, it "flashes" or boils into steam Again, the force of this steam provides the energy to spin the turbine and produce electricity. The geothermal water and steam are then reinjected directly back down into the earth to maintain the volume and pressure of the reservoir. Gradually they will be reheated and can then be used again.
4.A reservoir with temperatures below 300° Fahrenheit is not hot enough to flash steam but it can still be used to generate electricity in binary fluid. The steam from this is used to power the turbines. As in the flash steam plant, the geothermal water is recycled back into the reservoir.
文章(23~30)
Paragraph1_____A.Dry steam plants
B.Binary plants
C.Origin of geothermal energy
D.Generation of electricity
E.Flash steam plants
F.Recyclable water and steam
考题
A dry-steam reservoir produces steam with _____.A.the energy to turn a turbine
B.impermeable rock
C.one or two separators
D.turbine operator
E.little or no water
F.hot springs
考题
如果项目有70%的概率获得￥100，000的利润，30%的概率获得￥100，000的损失，项目的预期货币值EMV是：（）A、￥100，000利润B、￥70，000损失C、￥40，000利润D、￥30，000损失
考题
单选题如果项目有70%的概率获得￥100，000的利润，30%的概率获得￥100，000的损失，项目的预期货币值EMV是：（）A
￥100，000利润B
￥70，000损失C
￥40，000利润D
￥30，000损失
考题
单选题A deep draft VLCC (100，000 DWT+) navigating in a narrow channel or canal（）.A
draws more water than when underway in deep waterB
draws less water with an increase in speedC
requires less power for a given speedD
steers better under full power
考题
单选题（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.A
The medium speed 4-stroke trunk piston engineB
The low speed 2-stroke crosshead engineC
The medium speed 2-stroke crosshead engineD
The low speed 4-stroke trunk piston engine
考题
单选题Which method should be used to warm up the pump turbines prior to discharge（）.A
Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB
Run the pump at high speed with the discharge valves closedC
Run the turbine at slow speed with the pump disconnectedD
Shut the discharge valve and run the pump at slow speed
考题
单选题What is an advantage of a steam turbine over a diesel for the main propulsion?（）A
Faster response from ahead to asternB
Less fuel consumptionC
Cheaper initial installation costD
Less weight per unit of horsepower
考题
单选题What is an advantage of diesel over steam turbine propulsion? （）A
Less fuel consumption per SHPB
Diesel fuel costs less than bunker C or its equivalentC
Less routine maintenance requiredD
Less weight per SHP
考题
单选题When planning the loading or discharging of a VLCC (100，000 DWT+) what is the most important consideration?（）A
Draft and trimB
Limits of the bending momentsC
Rate of dischargingD
Rate of loading
考题
单选题A VLCC (100，000 DWT+) with a 30，000 Shaft Horsepower Steam Turbine is slow to respond to engine movements and has less stopping power than normal ships because it has a（）.A
bigger propellerB
smaller power to weight ratioC
smaller propellerD
larger power to weight ratio
考题
单选题A grease gun is generally used to lubricate a （）.A
condensate pump ball bearingB
main shaft bearingC
main turbine bearingD
diesel engine wrist pin bearing
考题
单选题A tug’s horsepower available at the shaft is（）.A
indicated horsepowerB
brake horsepowerC
dynamic horsepowerD
net horsepower
考题
单选题As for turbine oil, contact with water in the form of steam will be inevitable so good （） properties will be essential.A
defrostingB
de-oilingC
demulsifyingD
dehumidifying
考题
单选题Gas turbines differ from steam turbines in that （）.A
steam rather than gas is used to turn a shaftB
vapor rather than gas is used to turn a shaftC
the former uses gas to turn a shaftD
the latter uses gas to turn a shaft
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