輪機英語單項選擇題每日一練(2020.03.19)

單項選擇題
When starting a reciprocating pump, the inlet valve should be （）.
A.closed
B.opened fully
C.cracked open
D.partly open
單項選擇題
The （） of the gravity disc is too big It causes oil to flow through the water outletWe changed the disc and no oil is found in the water outlet.
A.gravity
B.diameter
C.circumference
D.cylinder
單項選擇題
In heavy marine engine the practice is to drive the engine on（）which has previously been stored in starting air reservoirs.
A.electric motor
B.hydraulic motor
C.compressed air
D.turning gear
單項選擇題
Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）
A.The coolant temperature must be maintained at 180℃
B.The thermostatic bypass valves must be manually opened before the engine is started
C.The pressure cap must be removed while the engine is secured
D.Electrical power to the heater must be secured before the cooling system is drained
單項選擇題
The cooling water of the diesel engine should be treated, because it has（）
A.alkale scence
B.acidity
C.salinity
D.impurity

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