The air cylinder bottles in the survival craft should be refilled with（）.

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• When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.

  A . just B . nearly C . merely D . already

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• Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passages

  A . (1)+(2) B . (1)+(3) C . (2)+(3) D . (1)+(2)+(3)

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• When the air charge contacts with the cylinders and pistons and mixes with the residual gases, it will（）

  A . increase in temperature B . lose its energy partly C . expand and do work D . begin to be compressed

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• In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

  A . downwards；upwards B . upwards；downwards C . downwards；downwards D . upwards；upward

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• If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）

  A . on the power stroke B . on the exhaust stroke C . at the end of the power stroke D . at the start of the intake stroke

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• The purpose of compressing the air within the cylinder of a diesel engine is to （）

  A . produce the heat for ignition B . decrease injection lag C . increase ignition delay D . aid in exhausting burnt gase

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• It is very necessary that each cylinder （） before the charged air is compressed.

  A . is scavenged B . is atomized with fuel oil C . be scavenged D . be atomized with fuel oil

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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 rod

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• When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）

  A . suction stroke B . compression stroke C . power stroke D . exhaust stroke

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• It is very important that each cylinder should be （） scavenged before the charged air is compressed.

  A . well B . good C . excellent D . respectively

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• When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）

  A . intake stroke B . compression stroke C . power stroke D . exhaust stroke

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• （） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.

  A . Because B . Owing to C . For D . No matter

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• The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.

  A . the beginning of the compression stroke B . the beginning of the suction stroke C . the end of the working stroke D . the end of the exhaust stroke

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• （） supplies pilot air to control the cylinder air start valves.

  A . An air compressor B . An indicator cock C . An air distributor D . A safety valve

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• The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an （）

  A . air compressor B . diffuser C . after-cooler D . ventilator

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• Before starting the engine the air bottle should be （）.

  A . pumped up B . loaded C . discharged D . opened

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• Air compressor cylinder un-loaders enable the compressor to （）.

  A . vary their speed according to temperature and load B . start and come up to speed before air compression begins C . change speed according to overload demands D . reduce compressed air charge density

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• In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.

  A . cooling water B . vapor from the boiler C . starting air D . hot gase

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• How does combustion air enter the cylinder of a two-cycle diesel engine?（）

  A . Cylinder head valves B . Ports C . Turbo chargers D . Bleeder valve

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• The starting air entering the cylinder begins when the piston（）

  A . has nearly come to the TDC B . has just past the TDC C . has nearly come to the BDC D . has just past the BDC

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• Charging is the filling of the engine cylinder with a supply or charge of fresh air （） compression.

  A . to need B . ready for C . want to D . going to be

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• Usually we take the cooling effect of the air flown through the cylinder during the overlap period as（）

  A . inevitable B . harmful C . helpful D . unacceptable

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• In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

  A . by an fuel valve B . through an inlet valve C . with an exhaust valve D . from an outlet valve

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