更多"Heavy wear in a particular area of "的相关试题:
[单项选择]The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.
A. wheel
B. crankshaft
C. running gear
D. cam
[单项选择]Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）
A. dirty delivery ducts
B. too much refrigerant
C. the fouling filters
D. high temperature outside
[单项选择]Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.
A. bending joint
B. expansion tank
C. weld
D. the highest point
[单项选择]To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.
A. lantern rings
B. bearings
C. easing volutes
D. wearing rings
[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]The inner bottom is the（）.
A. tank top
B. compartment between the tank top and shell of the vessel
C. inner side of the vessel's shell
D. space between two transverse bottom frames
[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]The most important factor that causes the wear of the engine parts is （）.
A. excessive heat
B. friction
C. oxidation
D. high pressure
[单项选择]Excessive piston ring wear in a diesel engine will cause（）
A. high lube oil viscosity
B. increased lube oil consumption
C. low lube oil temperatures
D. high firing pressures
[单项选择]
In a diesel engine, excessive cylinder liner wear will cause （）
(1) increased blow-by
(2) wear between the piston ring and groove
A. (1) only is correct
B. (2) only is correct
C. both (1) and (2) are correct
D. neither (1) or (2) axe correct
[单项选择]Top and inner graduated borderlines of the chart are（）.
A. scales of latitude
B. scales of longitude
C. compass rose
D. source data
[单项选择]The inner part of the condenser should be cleaned with （）.
A. gas oil
B. diesel oil
C. chemical compound
D. Freon-12
[单项选择]Wear occurring at the tips of the reduction gear teeth is usually the result of （）.
A. surface fatigue
B. fretting corrosion
C. heavy overloading
D. gear misalignment
[单项选择]If cylinder liner wear is up to maximum limits the possibility of scavenge fires will not be materially reduced until the liners are （）.
A. polished
B. renewed
C. adjusted
D. ground
[单项选择]Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.
A. acidity of the oil
B. pour point of the oil
C. flash point of the oil
D. viscosity of the oil
