單項(xiàng)選擇題The most crucial time for any bearing with regards to lubrication is ()

A.during low loads
B.after proper oil viscosity is reached
C.during starting
D.after cleaning filters


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1.單項(xiàng)選擇題If a main propulsion diesel engine hunts excessively at idle speed, you should ()

A.adjusts the idle speed control
B.drain and flushes the governor and replace the oil
C.adjusts the compensating needle valve

3.單項(xiàng)選擇題Air bubbles in a hydraulic governor can cause ()

A.sluggish response
B.speed droop variations
C.isochronous governing
D.sensitivity increase

4.單項(xiàng)選擇題On a diesel engine equipped with an isochronous governor, if the “speed droop” control is reduced to the “zero” setting, the engine ()

A.speed will drop drastically with any increase in load
B.will stop due to zero fuel supply
C.will stall upon application of load
D.speed will remain fairly constant despite load changes

5.單項(xiàng)選擇題Proper operation of the main engine reduction gear set requires the operation to monitor ()

A.the sump oil level
B.oil flow sight glasses
C.bearing temperatures
D.all of the above

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Which one is NOT the ‘clear grounds’ for a more detailed inspection?()

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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?()

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During the diesel engine running, the water level of F.W expansion tank should normally kept in the () level of glass tube.

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Engine parameters shall be corresponded to NOx Technical Files. This is required by ()

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To shut down a diesel engine after it exceeds the set maximum speed,which type of device listed should be used?()

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The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated()

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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()

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The additional mark ()in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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The condensers located in various stages of a flash evaporator are cooled by()

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The cetane rating of diesel fuel is an indication of the ()

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