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单选题
Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.
A
spark plugs
B
glow plugs
C
heat of compression
D
a magneto
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单选题The starting of a marine diesel engine is generally carried out with the assistance of （）.A
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单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）A
quantity of fuel injected is decreasedB
quantity of fuel injected will always be increasedC
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duration of injection will always be greater
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单选题On most diesel engines, the governor controls the output speed by （）.A
controlling the amount of fuel injected into the cylindersB
varying the speed of the turbochargerC
adjusting the compression ratioD
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单选题If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）A
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valves will close laterC
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amount of fuel injected will be decreased
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单选题When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）A
Quantity of fuel injected tends to be decreasedB
Quantity of fuel injected will always be increasedC
Start of injection tends to be advancedD
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单选题Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.A
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main bearingsC
crankpin bearingsD
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单选题When fuel is injected late into a diesel engine cylinder,（）.A
the exhaust will be clearB
fuel consumption will be lowC
all the fuel will be burned at top dead centerD
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单选题In a marine diesel engine the oil sump is （）.A
just below the crankcaseB
the oil cup for the exhaust valveC
the pan for collecting drain fuel oilD
oil circulating pump
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单选题In a diesel engine, when the fuel is injected into the cylinder,（）A
the piston is just coming upward from the bottom dead centerB
the piston has moved about one-fifth of the way upC
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the piston has just past the TDC
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单选题Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.A
heat conduction into the injected fuel oilB
heat conduction into the water jacket wallC
water circulation through passages in the holderD
fuel oil circulation through passages in the holder
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单选题（） into the cylinder because no fuel can burn （） it.A
Air must be admitted；withoutB
Oil must be injected；withoutC
Air must be admitted；withD
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单选题After the ship is out of the harbour and in “Full Speed”, well change （）.A
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prolong the ignition delay periodB
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allow controlled fuel combustion
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the fuel igniterC
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fuel economy is not affectedC
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单选题In common rail engines, the fuel is（） before is injected into the cylinders.A
stored in a common fuel lineB
pumped by the injection pumpC
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单选题Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）A
a combination of constant volume and constant pressureB
a combination of constant temperature and constant pressureC
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单选题Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）A
entirely constant pressureB
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a combination of constant volume and constant pressureD
a combination of constant temperature and constant pressure
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