In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）

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• In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.

  A . scavenging air ports；exhaust ports B . inlet ports；scavenging air ports C . scavenging air ports；inlet ports D . exhaust ports；inlet port

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• What is the crank angle between any two crank throws in the firing order of a four-stroke/cycle, in line, eight cylinder diesel engine?（）

  A . 45 B . 60 C . 90 D . 100

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• The pressure head of a pump is given in the unit of （）.

  A . kg B . MPa C . meter fluid column D . None of the above is true

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• Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.

  A . a shortened ignition delay period B . a lean fuel/air mixture C . excess fuel in the combustion chamber D . rapid vaporization of injected fuel droplet

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• In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）

  A . Differential B . Trunk C . Barrel D . Valve-in-head

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• （）means check the swing of the vessel’s head in a turn.

  A . Steady B . Meet her C . Midships D . Stop engine

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• Which measure should NOT be taken to reduce the pounding of a vessel in a head sea?（）

  A . Add ballast in the afterpeak B . Add ballast forward C . Alter course D . Reduce speed

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• A diesel engine cylinder head can crack as a result of （）

  A . a leaking seal ring B . heat transfer from exhaust valves C . restricted cooling passages D . overheated intake valve

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• Water accumulation in the cylinder of a secured engine is an indication that the （）

  A . soft water pump was not secured along with the engine B . jacket water thermostat has failed C . cylinder liner may be cracked D . raw water pump is over-speeding just prior to engine shutdow

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• Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）

  A . electronic ignition system B . compression of air by the piston C . friction in the fuel injector D . fuel oil bearing system

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• Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）

  A . amount of scavenge air to the cylinder B . quality of fuel injected C . viscosity of the lube oil D . compression ratio of the pisto

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• Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）

  A . cylinder valves B . compression rings C . piston skirts D . oil ring

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• If a heavy sea strikes the rudder, the shock is transmitted through （） to the rams, this cause a sudden increase in oil pressure in one of the cylinders.

  A . the control rod B . the hunting gear C . the floating ring D . the tiller arm

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• The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）

  A . expansion of the combustion gases B . exhaust and intake valves just closing C . maximum compression is just being attained D . fuel injection occurring at that point and combustion begi

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• Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）

  A . increase back pressure during the exhaust process B . facilitate periodic replacement of the valves C . reduce the pumping loss associated with scavenging D . reduce tension on valve spring

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• In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）

  A . build up the piston crown by metal spraying B . build up the cylinder head by metal spraying C . insert shims between the crankpin bearing box and the connecting rod foot D . install a thinner head gasket

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• At the instant when a string of casing being run from a ship is landed in the well head,（）.

  A . the total weight in air of the casing string is removed from the ship B . the hook load (weight of the casing string) is removed from the ship C . the weight of the casing inside the riser is removed from the ship D . the weight of the casing string added to the weight of the fill-up mud is removed from the shi

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• One advantage of dry cylinder liners used in a diesel engine is the（）

  A . lower thermal expansion rates than wet liners B . greater heat transfer rate than wet liners C . greater wear resistance than wet liners D . procedure to replace dry liners is simpler than for wet liner

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• The pressure head of a water pump is given in the unit of （）.

  A . kg B . MPa C . mH20 D . None of the above

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• In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the liner

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ and Ⅱ

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• The lower end of each piston rod is reduced in diameter to fit a bore in the cross-head, this being secured to the piston rod by （）.

  A . a bolt B . a cap C . a disc D . a nut

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• With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure, which is the best means to （） of the engine.

  A . increase the exhaust temperature B . increase the power of C . reduce the speed D . increase the fuel consumptio

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• The Heading of a Job application letter should be written in the ________ corner.

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• One advantage of dry cylinder liners used in a diesel engine is the_________.

  A.lower thermal expansion rates than wet liners B.greater heat transfer rate than wet liners C.greater wear resistance than wet liners D.procedure to replace dry liners is simpler than for wet liners

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