单选题Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）A Clogged air intake faltersB Piston blow-byC A defective after-coolerD Faulty exhaust valve

● Which of the following can be tracked using the WBS?

A time

B cost

C performance

D scope

E None of the above.

Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?

A.The mixture is too lean to burn

B.The mixture is too rich to burn

C.The vapor is about to explode

D.Conditions are perfect for combustion

A、Viral bacterial infection.

B、Liver poisoning

C、Traumatic injury to the liver

D、All of the above-mentioned.

According to this passage, which of the following statements is true?

A.In boiler and machinery spaces, there is the air conditioning.

B.In the boiler rooms the requirement of air volume should meet 25-50% of combustion requirement.

C.To maintain the comfort zone in the separate control room the air conditioning plant should be fitted.

D.The comfort conditions can be maintained in the engine room all the time.

In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?

A.Noise coming from that air starting valve

B.Continuous operation of the starting air compressor

C.Zero air pressure in the air starting system

D.Overheated starting air pipe to the cylinder head

Which of the listed conditions can be considered as the single greatest cause of accidents?

A.Speed

B.Excessive knowledge or skill

C.Human error

D.Excitement

The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?

A.Faulty thermostatic bypass valve

B.Eroded zinc pencils in the heat exchanger

C.Steam formation in the expansion tank

D.Excessive leakage from jacket water pump seals

Which of the following can be tracked using the WBS?

A.time

B.cost

C.performance

D.scope

E.None of the above.

题干材料：Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.

The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.

The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time.

问题：Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?

A.air compressor

B.air cooler

C.air-conditioning plant

D.mechanical ventilation plant

In a motor vessel, the air quantity which the engine room need is_______ of the requirements of the engines.A.less than 25-50%

B.more than 125-150%

C.more than 25-50%

D.less than 125-150%

According to this passage, which of the following statements is true?

A.In boiler and machinery spaces, there is the air conditioning

B.In the boiler rooms the requirement of air volume should meet 25-50% of combustion requirement

C.To maintain the comfort zone in the separate control room the air conditioning plant should be fitted

D.The comfort conditions can be maintained in the engine room all the time

At the middle pressure and large air quantity,_________ is more suitable.A.an axial flow fan

B.a radial flow blower

C.a centrifugal fan

D.an auxiliary blower

请帮忙给出每个问题的正确答案和分析，谢谢！