64. A reduction 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
65. A separate piston cooling system is used _____ any contamination from piston cooling
glands to the piston cooling system only. A． to help B． to limit √ C． to protect D． to remove
66. A separate piston cooling system is used to limit any contamination _____ piston cooling
glands_____ the piston cooling system only. A． between, to B． either, or C． from, to √ D． neither, nor
67. A single piece_____ fitted with bronze rings guides the piston in the cylinder liner.
A． piston skirt √ B． piston crown C． guide way D． cross-head
68. A variable pitch propeller is made _____ a boss with separate blades mounted into it.
A． of B． up of √ C． from D． out
69. A: Please tell me the specifications and quantityB: _____.
A． Pump diesel oil first
B． 300 tons of 180 cst fuel oil √ C． The figure is all right D． OK, I’ll sign it
70. About half an hour before the engine is required, cooling water at _____ must be circulated.
A． more than the working temperature B． less than the working temperature C． the working temperature √
D． the same as the surrounding temperature
71. According to the way the energy of the exhaust gases is utilized, pressure-charging can
be divided into two main systems, namely, the constant-pressure system and _____.
A． the pulse-phase system B． the pulse Doppler system C． the pulse system √ D． the pulse interval
72. Acid solution in the system can be tested from time to time by putting some on to a piece
of lime. A． strength √ B． dense C． percentage D． velocity
73. Additives _____ protective layers on metal surfaces guarding them against corrosion.
A． damage B． form √ C． dissolve D． contaminate
74. Adjust _____ by means of lead wire.
A． the clearance of the main bearing √ B． the diameter of main bearing C． the gap of main beating D． the tolerance of main bearing
75. Administrations should bear in mind the significance of _____ in maintaining safety of
life and property at sea and in preventing marine pollution. A． advanced nautical equipment B． advanced performance main engines C． emergency equipment
D． communication and language skills √
76. A-frames and cylinder block is held together by _____ to form a rigid structure.
A． connecting rods B． piston rods C． tie rods √ D． jack-bolts
77. A-frames are mounted on the bed plate and support _____ and cylinder block.
A． the main bearing B． the cylinder cover C． the entablature √ D． the sump
78. After \
and indicator cocks opened, and the cooling water kept running. A． steering
B． timing C． turning √ D． running
79. After ensuring that the _____ is correct the bearing clearance should be checked.
A． nap B． gap C． nip √ D． deflection
80. After fitting back in place the gear wheels, dont forget _____ them.
A． to grease √ B． greasing C． oiling D． lubricating
81. After passing through the turbine the exhaust gas is conducted out into the _____.
A． intercooler B． compressor C． cylinder D． open air √
82. 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
83. 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
84. 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 √
85. 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
86. 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 √
87. 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 √
88. 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
89. 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
90. 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 √
91. 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
92. 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
93. 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
94. 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
95. 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
96. 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
97. 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
98. 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