99. 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 √
100.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
101.Bearing knocks are likely to occur from _____.
A． less clearance B． dirty lube oil C． overload D． bearing wear √
102.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
103.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 √
104.Before \
_____ 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
105.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
106.Before being used the fuel service tank should be drained of _____.
A． soda solution B． mechanical impurities C． ballast
D． water and residuals √
107.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
108.Before replacing a piston you should check that all rings are _____.
A． free √ B． fastened C． broken D． stuck
109.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 √
110.Before replacing a piston you should check the rings to see that all clearances and gaps
are within the permissible _____. A． deflection B． discrepancy C． error D． tolerance √
111.Before starting the engine the air bottle should be _____.
A． pumped up √ B． loaded C． discharged D． opened
112.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
113.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 √
114.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
115.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
116.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
117.Cast iron carrier rings, _____ machined grooves, are provided for all the pistons.
A． caulked into √ B． caulking into C． pressed into D． screwed into
118.Charging is the filling of the engine cylinder with a supply of _____ for compression.
A． water B． fresh air √ C． fuel oil D． gas
119.Charging is the filling of the engine cylinder with a supply or charge of fresh air _____
compression. A． to need B． ready for √ C． want to D． going to be
120.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
121.Compressed air is supplied by air compression to _____.
A． the air receivers √ B． the starting valves C． the cylinder covers D． the distributors
122.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 √
123.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 √
124.Cooling enables the engine metals _____ their mechanical properties.
A． to retain √ B． to remain C． to maintenance D． to have
125.Cooling of engine is achieved by circulation a cooling liquid around internal passages
within the _____. A． boiler B． heater C． engine √ D． cooler
126.Cooling of engines is achieved by _____ a cooling liquid around internal passages within
the engine. A． flowed B． flowing C． mixing D． circulating √
127.Cooling of engines is achieved by circulating a cooling liquid around internal _____
within the engine. A． air
B． passages √ C． pipes D． means
128.Cracks in cylinder and cylinder covers may _____ from unequal heating.
A． make B． cause C． result √ D． produce
129.Cracks in the cylinders and cylinder covers may _____ unequal heating.
A． result from √ B． result in C． give out D． given from
130.Cracks in the cylinders and cylinder covers may result from _____.
A． low speed
B． unequal heating √ C． less lubricating D． low charge air pressure
131.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
132.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
133.Cylinder liner cooling is often referred to as _____.
A． piston cooling B． sleeve cooling C． central cooling D． jacket cooling √
134.Cylinders of marine diesel engines are normally cooled by _____.
A． sea water B． fine mineral oil C． sanitary water D． fresh water √