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单选题
Most high pressure areas are accompanied by（）.
A
precipitation
B
clear，cool weather
C
humid，sticky weather
D
cool fogs
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单选题A marine diesel engine is started by（）A
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supplying high temperature air into the cylinderC
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单选题Late fuel injection timing is indicated by （）A
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lower than normal cylinder pressure and high exhaust temperatureC
higher than normal cylinder pressure and low exhaust temperatureD
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单选题The fourth engineer accompanied by the workers on oil barge measures the oil levels, temperature and （） in the tanks.A
tank tableB
trimC
water contentsD
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单选题Two well-developed high pressure areas may be separated by a（）.A
Hill of low pressureB
Trough of low pressureC
Valley of low pressureD
Ridge of low pressure
考题
单选题If a refrigeration compressor is short cycling on high head pressure, you should （）.A
purge the condenser if the waterside is dirtyB
check for proper water flow through the condenserC
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单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
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单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.A
the relief valve should open before the high pressure cutoutB
the relief valve should open and allow the excess refrigerant to flow to the receiverC
the high pressure cutout switch should operate before the relief valve opensD
you should close in on the suction valve
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单选题If the head pressure is too high,（）A
the relief valve should open before the high-pressure cutoutB
the relief valve should open and let excess refrigerant go to receiverC
the high-pressure cutout switch should operate before the relief valve opensD
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单选题The direction of the surface wind is（）.A
directly from high pressure toward low pressureB
directly from low pressure toward high pressureC
from high pressure toward low pressure deflected by the earth's rotationD
from low pressure toward high pressure deflected by the earth's rotation
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单选题Either a low injection pressure or a leakage of piston rings is able to lead （）.A
a high exhaust temperatureB
a high smoky exhaustC
a high outputD
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考题
单选题When observing a rapid rise in barometric pressure，you may expect（）.A
Clear weather with no wind，but the possibility of rain or snow within 24 hoursB
Deteriorating weather with rain or snowC
Heavy rain or severe thundershowersD
Clearing weather，possibly accompanied by high winds
考题
单选题Pressure gradient is a measure of（）.A
a high-pressure areaB
pressure difference over horizontal distanceC
pressure difference over timeD
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单选题A crew member reports that the high-pressure alarm light of a low-pressure CO2 fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.A
an air leak has developed in the tankB
the tank cooling system has malfunctionedC
the pilot cylinder discharge valve is leakingD
an excessive amount of insulation has been installed on the tank and piping
考题
单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.A
A common rail engine；conventional enginesB
A conventional engine；common rail enginesC
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考题
单选题High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）A
improper fuel rack positingB
lengthy exhaust valve durationC
extend operation at light loadD
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考题
单选题Brief，violent showers frequently accompanied by thunder and lightning are usually associated with（）.A
passage of a warm frontB
passage of a cold frontC
winds shifting counterclockwise in the Northern HemisphereD
stationary high pressure systems
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