Diesel engine air start valve timing is controlled by（）

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• Cooling the intake air supplied to a diesel engine will （）.

  A . reduce mean effective pressure B . decrease average compression pressure C . decrease air charge density D . increase power output

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• In an operating diesel engine, which of the following condition 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

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• By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by （）.

  A、rotary compressors B、reciprocating compressors C、centrifugal compressors D、screw compressors

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• A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is （）

  A . one-half engine speed B . the same as engine speed C . twice engine speed D . four times engine speed

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• Diesel engines obtain combustion air through turbo chargers，blowers，or（）.

  A . air starters B . carburetors C . natural aspiration D . air receiver

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• Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）

  A . Holding the valve open for a long period B . Increasing the starting air pressure used C . Opening the stating air valve quickly D . Reducing the starting air valve size

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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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• A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）

  A . has little or no internal friction B . has a lower effective compression ratio C . operates with scavenge air under a positive pressure D . operates without energy absorbing intake and exhaust stroke

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• When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be （）

  A . an obstruction in an cylinder B . water accumulation in some engine cylinders C . low starting air pressure D . low scavenge air pressure

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• Immediately after any diesel engine is started, the engineer should check the （）

  A . crankcase pressure B . lube oil pressure C . saltwater pressure D . exhaust temperature

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• Air scavenging of a diesel engine cylinder（）

  A . blows out the exhaust gases B . supplies oxygen for combustion C . cools the valves and cylinder walls D . all of the above

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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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• What preventative maintenance should be done frequently to diesel engine starting air receivers?（）

  A . Drain the accumulated moisture B . Test the relief valves C . Watch the temperature to prevent fluctuations in pressure D . Clean the interior to remove oil and foreign matter

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• Before starting an engine by air, the engine must（）

  A . be turned by a turning gear for at least one minute B . be turned by a turning gear for at least two minutes C . be turned at least one complete turn D . be turned at least two complete tur

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• Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）

  A . increase in starting air pressure B . increase in lube oil viscosity C . compression expansion device D . jacket water heater

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• The timing of diesel engine air starting valves is controlled by（）

  A . the air start valve timing gears and rods B . a cylinder check valve C . individual cams and valve gear D . an air manifold poppet valve

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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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• Diesel engine air start system check valves are opened by （）

  A . an air start cam B . cylinder compression pressure C . starting air pressure D . valve spring

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• A restricted air intake to a diesel engine may result in the engine （）.

  A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

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• Before starting a diesel engine, you should always（）

  A . check the pyrometer readings B . check the crankcase oil level C . check the fuel oil strainers D . clean the fuel system

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• The main purpose of starting the diesel engine on air briefly is（）

  A . to inspect if the cylinder has the water leakage B . to expel out the residual water/gas/oil from the cylinder C . to check if fuel supply is normal D . A and B

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• Defective air cooler in a diesel engine will lead to （）.

  A . smoky exhaust B . starting failure C . overload D . over speed

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• The engine is started with （） supplied from air receivers.

  A . pressure oil B . pressure water C . compressed air D . cooling water

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• A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must （）

  A . line up the engine fore restarting with light diesel oil B . reposition the fuel injection cam C . change the intake and exhaust valve cam positions D . place the starting cam in the intermediate positio

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