更多"Water lubricated tailshaft bearings"的相关试题:
[单项选择]Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.
A. closed, and no leakage permitted across the shaft packing
B. closed, and only slight leakage permitted across the shaft packing
C. open, and no leakage permitted across the shaft packing
D. open, and only slight leakage permitted across the shaft packing
[单项选择]The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）
A. the rotate speed fluctuation
B. the ventilation tube clogged
C. the main engine accelerate so fast
D. stormy waves
[单项选择]The main advantage of improved Simplex tailshaft seal are（）
A. the good sealing performance and the simple structure
B. the good sealing performance and the short life expectancy
C. the good sealing performance but the short life expectancy
D. the good sealing performance and the lower cost
[单项选择]The tailshaft sealing arrangement found a little lube oil leaky and caused a lot of seawater into the bearing, the step should be taken as a makeshift is（）
A. dropping lube oil for lubrication, reducing the pollution to the sea
B. setting a temporary gravity oil tank and enhanced the position properly
C. lubricating with the used lube oil
D. lubricating with the fresh water and navigation in a lower speed
[单项选择]Simplex tailshaft seal equipment’s working condition is terribleThe main cause is （）
A. the shafting’s vertical vibration
B. violent friction and sea water corrosive
C. friction and high temperature
D. violent friction and high temperature
[单项选择]If you wear extra clothing when entering the water after abandoning ship it will（）.
A. weigh you down
B. preserve body heat
C. reduce your body heat
D. make it more difficult to breathe
[单项选择]A vessel has been equipped with an oil lubricated stern bearing and is undergoing a routine dry-dock.Which of the following inspection should be made when the tail-shaft has been drawn?（）
A. The overall condition of the bearing surface should be examined
B. The shaft liner should be inspected for cracks and tested to insure a tight fit
C. The stern tube should be tested for cracks with dye penetrant
D. all of above
[单项选择]A well-lubricated bearing surface always appears（）
A. well knurled
B. slightly streaked
C. lightly glazed
D. highly polished
[单项选择]The bearings used to support the crankshaft are generally called （）
A. line shaft bearings
B. connecting rod beatings
C. main bearings
D. support bearings
[单项选择]Grease the roller bearings with HPgun In the sentence “HP” means （）.
A. horse power
B. high pressure compressor
C. hand pump
D. high pressure
[单项选择]While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）
A. the bearing had been overheated
B. water was present in the oil
C. the lube oil was not being properly filtered
D. the maximum allowable bearing pressure had been exceeded
[单项选择]Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.
A. The direction of pressure on the journal in four-stroke engine is continuously
B. positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C. four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D. Low-stroke engines usually consume less lube oil than four-stroke engines
[单项选择]During check on top clearance in main bearings, turn the crankthrow for the relevant cylinder unit to （） and stop the lube oil circulating pump.
A. port side
B. starboard side
C. BDC position
D. DC position
[单项选择]Wristpin bearings are difficult to lubricate because of their oscillating motion and（）
A. their free-floating design
B. their relatively small size
C. the reciprocating motion of the piston
D. their position in the lubrication system
[单项选择]To obtain accuracy in fixing by DF cross bearings，（）should be used.
A. two stations，including one on the nearest coast
B. two stations，including one on the nearer coast
C. three stations，including one on the farthest coast
D. three stations，including one on the nearest coast
[单项选择]At 0715 you take the following bearings: Race Rock Light 328°pgc; Little Gull Island Light 249°pgc; Mt. Prospect Antenna 036°pgc. Based on your 0715 fix，which statement is TRUE?（）
A. You are to the left of your track line
B. Your fathometer reads about 265 fathoms
C. You are in a cable area
D. You are governed by the Inland Rules
[单项选择]（） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.
A. Too larger
B. Too smaller
C. Excess
D. Excessive
[单项选择]The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.
A. steel guides
B. steel shells
C. steel bearing caps
D. pig iron
