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单选题
Which of the following statements concerning the water tube and fire tube boilers is not true?（）
A
natural circulation of the water in the water tube boiler is better than that in the fire tube boiler
B
for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler
C
the water tube boiler will cost shorter time for steam raising
D
the water tube boiler require lower skill in operating and maintaining
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更多 “单选题Which of the following statements concerning the water tube and fire tube boilers is not true?（）A natural circulation of the water in the water tube boiler is better than that in the fire tube boilerB for the same output the water tube boiler will carry less mass of water compared with the fire tube boilerC the water tube boiler will cost shorter time for steam raisingD the water tube boiler require lower skill in operating and maintaining” 相关考题
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Which of the following statements is NOT true about vagina? ()
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Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?A.Baffle plates that have been bent during prior removalB.Leaks m the cooler tube nestC.Operating the engine while maintaining a high sea water outlet temperatureD.A punctured sea water strainer supplying cooling water to the heat exchanger
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Which of the following statements is TRUE according to the passage?___________A.Oceanic salinity has great effect on sea life
B.Many factors combine to cause changes in oceanic salinity
C.The movement of the water is related to the amount of salt
D.The temperature of the water has much to do with the oceanic salinity
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Which of the following statements concerning intellectual property is wrong？（）A、Intellectual property is an intangible creationB、Intellectual property in ludes patents，trademarks，copyrights，etc.C、Intellectual property is a visible creationD、There are some agreement sconcerning intellectual property under the WTO
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单选题Which of the following statements concerning energy is correct?（）A
Energy can be created or destroyedB
Energy may not be transformedC
The total quantity of energy in the universe is always the sameD
None of the above
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多选题Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)Ac=dBl and k are parallelCm and l are perpendicular
考题
单选题Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）A
Baffle plates that have been bent during prior removalB
Leaks in the cooler tube nestC
Operating the engine while maintaining a high sea water outlet temperatureD
A punctured sea water strainer supplying cooling water to the heat exchanger
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Cargoes are goods transported in bulkC
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Special tools are required for lapping or grindingB
It is impossible to throttle flow with a butterfly valveC
To close the valve, it is only necessary to turn the handle a quarter of a turnD
The butterfly valve should never be used in a freshwater system
考题
单选题Which of the following statements concerning the water tube and fire tube boilers is not true?（）A
natural circulation of the water in the water tube boiler is better than that in the fire tube boilerB
for the same output the water tube boiler will carry less mass of water compared with the fire tube boilerC
the water tube boiler will cost shorter time for steam raisingD
the water tube boiler require lower skill in operating and maintaining
考题
单选题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A
The safety valve escape piping should be disconnected from the valve body and a blank insertedB
The boiler vent valves should be openedC
All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaksD
All of the above
考题
单选题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A
The safety valve escape piping should be disconnected from the valve body and a blank insertedB
The boiler vent valves should be openedC
All handhole/manhole covers should be tightened up as much as possible to preclude any leaksD
All of the above
考题
单选题Which of the following may hardness of the boiler water cause?（） (1) scale formation (2) tube failure (3) corrosionA
（1）and（2）B
（1）and（3）C
（2）and（3）D
（1），（2）and（3）
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单选题Which of the following statements is true concerning centrifugal pumps?（）A
They are particularly suited for pumping high viscosity fluidsB
They are started with the discharge valve openedC
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单选题Which of the following statements is true concerning any evaporator?（）A
High conductivity of the distillate indicates distillate salinity is excessiveB
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考题
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The cetane number affects the amount of injection lagB
The cetane number is an indication of the fuels viscosityC
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考题
单选题Which of the following statements is correct concerning diesel engine cooling water systems?（）A
Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operationB
propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinderC
At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangersD
Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling
考题
单选题Which of the following statements is NOT the result of a lack of salt in the body?A
The body secretes more water.B
The body dries up.C
The person dies of thirst.D
The person gets fatter.
考题
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）A
It is lower than the ignition temperatureB
It is the temperature at which a substance will spontaneously igniteC
It is the temperature at which a substance, when ignited, will continue to bumD
It is the temperature at which the released vapors will fall within the explosive range
考题
单选题Which of the following statements is true concerning an oil cooler?（）A
The oil temperature is less than the cooling water temperatureB
The oil pressure is less than the cooling water pressureC
The oil pressure is greater than the cooling water pressureD
The oil flow control valve is always installed in the oil input line
考题
单选题On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?（）A
Feed-water heater internal tube surfacesB
Internal distillate cooler tubesC
Flash chamber vertical surfacesD
Distilling condenser tubes
考题
单选题According to the passage, which of the following statements is TRUE?A
All the universities have banned the sale ofbottled water.B
Plastic bottles may do harm to people's health.C
The purchase of soft drinks will increase.D
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单选题Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）A
The greater the atomization, the greater the penetrationB
The greater the atomization, the less the penetrationC
The degree of atomization has nothing to do with the degree of penetrationD
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单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）A
The agent is considered nontoxic at room temperature in low concentrationsB
The agent is less effective than carbon dioxideC
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The agent cannot be used on electrical fires because it leaves a residue
考题
单选题Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）A
An alarm device with audible and visible signals is required for all cooling water systemsB
Propulsion engines with bores over 200 mm are to be fitted with cooling water jacketsC
Each totally enclosed cooling system shall be provided with a suitable head tankD
Drain cocks are to be provided at the lowest points of all cylinder water jackets
考题
单选题Which of the following statements is correct concerning the viscosity of lubricating oil?（）A
Viscosity will increase as temperature increasesB
Viscosity is a measure of a fluid s internal resistance to flowC
Viscosity will decrease as temperature decreasesD
Viscosity is not dependent on temperature
考题
单选题Which of the following statements is correct relative to distillation plant operation?（）A
Distillation is the process of boiling seawater to produce vapor which is condensed into fresh waterB
Evaporation is the second part of the distillation process where brine is removedC
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Distillate is the product resulting from the evaporation of fresh water vapor
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