轮机部三管轮考试模拟题4(轮机英语)
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On small, low pressure, air compressors, the cylinders are usually lubricated by the _____.
- A.splash method
- B.mechanical force feed lubricators
- C.detached sump method
- D.internal cooling passages in the crankshafts and connecting rods
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In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?
- A.An open vent in the cooling system
- B.A fouled sea chest
- C.A restricted water passage in the engine
- D.Air entrained in the cooling water
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Engine room fires have been started by neglected oil leaks dripping on to hot pipes or exhaust manifolds _____ insulation has not been replaced after maintenance.
- A.which
- B.when
- C.whose
- D.what
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The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of _____.
- A.fusion
- B.vaporization
- C.sublimation
- D.condensation
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After fitting back in place the gear wheels, don’t forget to _____ them.
- A.fulfill
- B.eliminate
- C.grease
- D.bend
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The thermal expansion valve responds to the______.
- A.amount of superheat in the vapor leaving the coil
- B.amount of superheat in the liquid
- C.temperature in the evaporator coils
- D.pressure in the evaporator coils
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Which of the following may cause that an engine doesnt run on starting air?
- A.too low starting air pressure
- B.main start valve closed
- C.neither A nor B
- D.A and B
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A fuel leak occurs in the high pressure fuel piping between the injection pump and fuel nozzleThis requires immediate repair because of the _______.
- A.high cost of fuel
- B.serious fire hazard
- C.possibility of pollution
- D.poor combustion which will occur in that cylinder
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Fire detecting systems on merchant vessels may be arranged to sense _____.
- A.smoke
- B.rate of temperature rise
- C.ionized particles
- D.all of the above
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The magnetic field is provided by electromagnets so arranged that adjacent poles have _____.
- A.opposite polarity
- B.the same polarity
- C.negative polarity
- D.positive polarity
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