轮机英语
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[单项选择]Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of () to develop their full strength.
A. the piston rods
B. the crank throws
C. the thrust bearings
D. the main bearings
[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]As the plunger moves up, the ports are closed and the fuel () and delivered to the injector nozzle at very high pressure.
A. being compressed
B. to be pumped up
C. is pressurized
D. are built up
[单项选择]An overspeed safety device is usually fitted to a generator engine for () in the event of overspeed.
A. cutting power off the engine
B. increasing the fuel pump setting
C. braking the crankshaft
D. stabilizing the ship speed
[单项选择]Bearing knocks are likely to occur from ().
A. less clearance
B. dirty lube oil
C. overload
D. bearing wear
[单项选择]An interlock in the remote operating valve line stops the valve () when the engine turning gear is engaged.
A. to open
B. opening
C. open
D. opened
[单项选择]Among the rings of a piston the () one is subjected to the greatest load and temperature.
A. bottom
B. middle
C. top
D. none of the above
[单项选择]Be sure to make the engine turn by () before starting and after stopping .
A. steering gear
B. turning gear
C. steering wheel
D. turning cycle
[单项选择]An electrically driven automatically operating auxiliary blower is provided for slow speed and () of a low speed diesel engine.
A. manoeuvring operations
B. bad combustion
C. cooling
D. mooring trial
[单项选择]All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during () for new piston rings.
A. the running-in period
B. the running process
C. gas exchange process
D. the boiler firing
[单项选择]All three systems have the ports () to swirl the incoming air and direct it in the appropriate path.
A. angled
B. rounded
C. being angled
D. being rounded
[单项选择]Aluminum pistons have () coefficient of thermal expansion compared with those of cast iron.
A. higher
B. lower
C. the same
D. none of the above
[单项选择]An aluminum piston has lower inertia and higher coefficient of () compared to that of cast iron.
A. viscosity
B. twisting moments
C. inertia
D. thermal expansion
[单项选择]After the order “()” is given, the air system is shut down, the turning gear put in.
A. Finished with Engine
B. Stop the Engine
C. Stand-by Engine
D. Slow-down Engine
[单项选择]At the top of the A-frames there is a strong cast iron frame called ().
A. cylinder liner
B. cylinder cover
C. the gear box
D. the scavenging box
[单项选择]At least () cylinders in four-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position.
A. 6
B. 2
C. 12
D. 8
[单项选择]As a heat engine,() energy is the source of power by which the diesel engine can be operated.
A. electric
B. heat
C. mechanical
D. exhaust
[单项选择]An increase in load on a diesel engine results in () of speed of the crankshaft.
A. a reduction
B. an increase
C. an outing
D. a downwards
[单项选择]After the engine is warned, we should() the turning gear before starting up the engine.
A. take in
B. put in
C. take out
D. put up
[单项选择]As for a diesel engine, lack of combustion air may be due to ().
A. fouling turbine
B. fuel pump faults
C. lubrication failure
D. excessive cooling
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