轮机英语
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[单项选择]Before pumping up the crankcase oil,() should be worked by hand to minimize corrosive action on the liners.
A. the indicators
B. the starting valves
C. the cylinder lubricators
D. the turning gear
[单项选择]Bedplates are the () of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.
A. hull
B. projection
C. graphitization
D. foundation
[单项选择]Before starting the turning gear, () should be worked by hand to minimize corrosive action on the liners.
A. the indicators
B. the starting valves
C. the cylinder lubricators
D. the turning gear
[单项选择]Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine () ahead and astern.
A. a brief trial with turning gear
B. a brief trial on power
C. a long trial by steering gear
D. one minutes trial with windlass
[单项选择]Before starting the engine the air bottle should be ().
A. pumped up
B. loaded
C. discharged
D. opened
[单项选择]Care and cleanliness are required when installing diesel fuel filters ().
A. to prevent the fuel system from becoming air-hound
B. to prevent the fuel system becoming clogged with dirty particles
C. both of the above
D. to prevent the lubricating oil from leaking out of the filter element
[单项选择]Charging is the filling of the engine cylinder with a supply of () for compression.
A. water
B. fresh air
C. fuel oil
D. gas
[单项选择]Bridge gauge can be used to measure () of a diesel engine.
A. diameters of journals
B. deflections of crankwebs
C. diameters of crankpins
D. none of the above
[单项选择]Compressed air is supplied by air compression to ().
A. the air receivers
B. the starting valves
C. the cylinder covers
D. the distributors
[单项选择]Charging-air pressure increases if there is incorrect combustion and drop in the () of the diesel engine.
A. machine efficiency
B. machinery efficiency
C. mechanical efficiency
D. mechanics efficiency
[单项选择]Before a marine diesel engine is started the cylinders and pistons must be ().
A. cooled to appropriate temperature
B. warmed up gradually to appropriate temperature
C. opened up and renewed
D. ground and polished
[单项选择]Cast iron carrier rings, () machined grooves, are provided for all the pistons.
A. caulked into
B. caulking into
C. pressed into
D. screwed into
[单项选择]Before replacing a piston you should check that all rings are ().
A. free
B. fastened
C. broken
D. stuck
[单项选择]Blow-off of the relief valves of the engines cylinders may be caused by ().
A. too low lead
B. water in fuel
C. too tight spring
D. leakage
[单项选择]Blow-off of the relief valves of the main cylinders during operation indicates ().
A. the cylinder cover is cracked
B. the injector holes is clogged
C. the cams are not properly set
D. fuel pump is leaking
[单项选择]Before being used the fuel service tank should be drained of ().
A. soda solution
B. mechanical impurities
C. ballast
D. water and residuals
[单项选择]Because the castings of smaller engines are not so big and heavy, () and cylinder block may be made in one piece.
A. the column
B. the jacket
C. cylinder cover
D. cylinder liner
[单项选择]Before replacing a piston you should check the rings to see that all clearances and gaps are () the permissible tolerances.
A. above
B. at
C. over
D. within
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