A.Return-flow
B.Uniflow
C.Cross-flow
D.Direct flow
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A.maintain higher than normal jacket water temperature
B.change the lube oil more frequently than normal
C.maintain a higher air-box temperature than normal
D.maintain a higher air-box pressure than normal
A.the exhaust will be clear
B.fuel consumption will be low
C.all the fuel will be burned at top dead center
D.fuel consumption will be high
In a diesel engine, when installing new piston rings it is important to check（）
Ⅰ.ring gap clearance
Ⅱ.side clearance
A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰnor Ⅱ
A.angularity of the piston motion
B.inertia moment from the piston
C.centerline of the cylinder
D.centerline of the king pin
A.Worn intake valve guides
B.Pitted pre-combustion chambers
C.Loose valve tappets
D.High exhaust back pressure
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Flame failure in an automatically fired auxiliary boiler can from a/an （）
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Cold weather starting of a diesel engine may be made easier by（）
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
Diesel engine air start system check valves are opened by （）
The shipboard oil pollution emergency plan will be invalid after （）
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）
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