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单选题
Which of the following statements is true concerning an oil cooler?（）
A
The oil temperature is less than the cooling water temperature
B
The oil pressure is less than the cooling water pressure
C
The oil pressure is greater than the cooling water pressure
D
The oil flow control valve is always installed in the oil input line
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更多 “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” 相关考题
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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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单选题Which of the following statements concerning cargo is correct?（）A
Cargoes are any type of goods transported by any type of shipsB
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单选题Which of the following statements is NOT true according to the passage?A
Over 30 oil workers have been kidnapped this year in the Niger Delta region.B
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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 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
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单选题Which of the following statements is true concerning the overall efficiency of air compressors?（）A
High pressure compressors are more efficient than low pressure compressorsB
Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unitC
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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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They are always mounted in a horizontal position
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单选题Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited（）.A
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High conductivity of the distillate indicates distillate salinity is excessiveB
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单选题Which of the following statements concerning fire-tube boilers is correct?（）A
Combustion gases flow through the tubesB
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Combustion occurs in the tubesD
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单选题Which of the following statements is true concerning the cetane number of diesel fuel?（）A
The cetane number affects the amount of injection lagB
The cetane number is an indication of the fuels viscosityC
Ignition lag is reduced with fuels having a high cetane numberD
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单选题Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）A
Both seamless mild steel and copper may be used for middle pressure steamB
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The feed piping of the boilers can be made of seamless mild steelD
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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
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单选题Which of the following statements is true concerning simple parallel resistance circuits?（）A
The total current flow equals the sum of the individual currentsB
The total current flow equals the reciprocal of the sum of the individual currentsC
The total resistance equals the sum of the individual resistanceD
The total voltage equals the sum of the individual voltages across each resistance
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单选题When bilge water is heated in a holding tank, which one of the following statements is not accurate?（）A
The high temperature facilitates primary gravity separationB
Most of the oil and organic solvents are raised to the top layerC
The high the temperature is, the more the top oil will be collectedD
The high temperature has little use on the separation of emulsified oil
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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
Halon primarily extinguishes the fire by coolingD
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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
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单选题Disastrous explosions have been caused by accumulations of oil or oil vapour in air lines not drainedAccording to the above sentence, which of the following statements is true?（）A
Oil vapour in air piping are dangerousB
Explosion will cause oil vapouring in air linesC
Oil vapour in air piping should be drainedD
Oil in air piping should not be drained
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