更多"Overgreasing of ball bearings insta"的相关试题:
[单项选择]In most pumps and pump motors overpacking the ball bearings full of grease will result in （）
A. moisture emulsification of the bearing grease
B. insufficient circulation and overheating of the bearing
C. proper grease circulation to cool the bearing
D. sliding friction between balls and races
[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]Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid （） pressure.
A. depending on
B. in relative to
C. regardless of
D. because of
[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]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]Main bearings are required to support the crankshaft at each （）.
A. end
B. web
C. pin
D. journal
[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]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]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]Positive displacement, helical gear pumps are well suited for pumping oil because （）
A. stuffing boxes eliminate the leakage problems usually associated with other gear pumps
B. it is not necessary to closely maintain design clearances with this pump
C. they are essentially self-priming and produce a high suction lift
D. these pumps are designed with extreme tooth angled
[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 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]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]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]Hydraulic pumps most commonly used in steering systems are of the （）.
A. lobe type
B. screw type
C. axial piston type
D. volute type
[单项选择]Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolatedfrom sources of vapor ignition by（）.
A. cofferdams
B. gastight bulkheads
C. passageways or living quarters
D. general cargo spaces
[单项选择]Which of the following pumps belongs to centrifugal pump?（）
A. Reciprocating pump
B. Screw pump
C. Diffuser pump
D. Water-ring pump
