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[单项选择]Diesel oil may be used to cool () of a diesel engine.
A. cylinders
B. exhaust valves
C. pistons
D. fuel valves
[单项选择]Cross scavenging requires the fitting of () to prevent air or exhaust gas escape when the piston is at the top of the stroke.
A. a exhaust valve
B. a piston skirt
C. a piston crown
D. an air suction valve
[单项选择]Dirt in the fuel oil system of a diesel engine can cause ().
A. clogged filters
B. poor combustion
C. overloading of the diesel
D. shock of fuel lines
[单项选择]Diesel engines are started by supplying () into the cylinders in the appropriate sequence for the required direction.
A. cooling water
B. compressing air
C. compressed air
D. cylinder oil
[单项选择]During the inspection, the starting air valves should be closed () the engine from turning.
A. to increase
B. to speed up
C. to prevent
D. to reduce
[单项选择]Crankshafts of medium speed engines are () from a single piece of steel.
A. unusually solid welded
B. never be solid forged
C. almost invariably solid forged
D. almost invariably be welded
[单项选择]Constant cooling the various components of diesel engine has a number of functions except for ().
A. good lubrication
B. low thermal stress
C. good mechanical properties
D. acid corrosion
[单项选择]Cracks in cylinder and cylinder covers may () from unequal heating.
A. make
B. cause
C. result
D. produce
[单项选择]During (), the starting air valves should be closed to prevent the engine from turning.
A. overhaul
B. running
C. blowing down
D. All of the above are correct
[单项选择]Dirty oil must be () before being used again.
A. mixed with clean oil
B. purified
C. heated
D. strained
[单项选择]Doors are generally formed in the () of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.
A. bedplates
B. columns
C. cylinder blocks
D. safety caps
[单项选择]Compressed air is used on board ship ().
A. for starting diesel engines
B. in pneumatic control system
C. in pneumatic tools
D. All the above are true
[单项选择]Cylinders of marine diesel engines are normally cooled by ().
A. sea water
B. fine mineral oil
C. sanitary water
D. fresh water
[单项选择]During repair,lubrication lines and orifices must be ().
A. taken away
B. engaged
C. connected
D. sealed off
[单项选择]Cracks in the cylinders and cylinder covers may () unequal heating.
A. result from
B. result in
C. give out
D. given from
[单项选择]Cooling enables the engine metals () their mechanical properties.
A. to retain
B. to remain
C. to maintenance
D. to have
[单项选择]Due to () action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.
A. reciprocating
B. rotating
C. running
D. removing
[单项选择]Cylinder liner cooling is often referred to as ().
A. piston cooling
B. sleeve cooling
C. central cooling
D. jacket cooling
[单项选择]Cooling of engine is achieved by circulation a cooling liquid around internal passages within the ().
A. boiler
B. heater
C. engine
D. cooler
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