更多"Wristpin bearings are difficult to "的相关试题:
[单项选择]The vessel has stayed in port for seven days because she needs（）.
A. repairs
B. repairing
C. repaired
D. being repaired
[单项选择]You are preparing to lubricate standing rigging on your vessel．When rigging a bosun’s chair on a stay with a shackle，（）.
A. Connect the shackle to the bosun's chair with a hook
B. Never allow the shackle pin to ride on the stay
C. Run the gantline through the shackle and then make fast to the bosun's chair
D. Tie the bitter end of the gantline to the shackle before shackling it to the bosun's chair
[单项选择]Oil will lubricate these parts （） effectively than water.
A. much
B. more
C. most
D. less
[单项选择]To lubricate the swivel or remove corrosion from a fire hose coupling，you should use（）.
A. glycerine
B. graphite
C. kerosene
D. fresh water and soap
[单项选择]The lube oil to lubricate the surfaces of the cylinder liners is spread over by the （）.
A. sliding piston rings
B. engines camshaft
C. small pumps
D. forced feed system
[单项选择]A grease gun is generally used to lubricate a （）.
A. condensate pump ball bearing
B. main shaft bearing
C. main turbine bearing
D. diesel engine wrist pin bearing
[单项选择]Main bearings are required to support the crankshaft at each （）.
A. end
B. web
C. pin
D. journal
[单项选择]Overgreasing of ball bearings installed on pumps will result in （）.
A. smoother pump operation
B. overheating of the bearing
C. reduced corrosion in the bearing
D. increased pump capacity
[单项选择]Water lubricated tailshaft bearings wear,（）
A. the after one is more than forward one
B. the forward one is more than after one
C. the forward one is the same with after one
D. it depends on the type of engine
[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]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]The oil pressure and flow from each bearings can be checked when（）
A. the lubricating pumps are stopped and the access doors are opened
B. the lubricating pumps are running and the access doors are opened
C. the engine is running and the access doors are closed
D. the engine is stopped and the access doors are closed
[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]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]The size of ball and roller bearings can be identified by the （）.
A. rolling member size
B. inner race cone width
C. manufacturers numerical code
D. outer ring width
[单项选择]Worn main bearings in a diesel engine can result in （）
A. decreased compression pressure
B. increased lube oil pressure
C. lower lube oil temperature
D. excessive leakage past the piston rings
[单项选择]On chart，bearings to near objects should be used in preference to objects farther off，because（）.
A. a small error in bearing or in laying it down on the chart has a greater effect in misplacing the position the longer the line to be drawn
B. all scales are kept updated for vital information by Notices to Mariners
C. the larger the scale of the chart，the greater the detail that can be shown on it
D. the mariner using the medium scale charts for passage along a coast need not transfer on to a large scale for short distances
[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]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
