更多"Which of the following may take pla"的相关试题:
[单项选择]Which of the following will take place if the clearance of the main bearings are excessive?（）
A. bearing knocks
B. dropping of pressure of LO
C. noises
D. all the above
[单项选择]
Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? （）
(1) too little cooling water
(2) too much cooling water
(3) too warm cooler water
A. （1）only
B. anyof（1），（2）and（3）
C. anyof（1）and（3）
D. anyof（1）and（2）
[单项选择]
Which of the following may hardness of the boiler water cause?（）
(1) scale formation
(2) tube failure
(3) corrosion
A. （1）and（2）
B. （1）and（3）
C. （2）and（3）
D. （1），（2）and（3）
[单项选择]
Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? （）
(1) faulty condensing
(2) too few refrigerant
(3) high discharge pressure
A. any of (1) and (3)
B. any of (1) and (2)
C. any of (2) and (3)
D. any of (1), (2) and (3)
[单项选择]Which of the following may lead to the engine NOT to start on air?（）
A. starting air pressure too high
B. correct timing of starting air valves
C. three of the six starting valves stuck
D. the turning gear disengaged
[单项选择]Which of the following may cause that an engine doesnt turn on starting air?（）
A. too low starting air pressure
B. main starting valve closed
C. neither A nor B
D. A and B
[单项选择]Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?（）
A. Poor combustion
B. High cylinder oil consumption
C. Leaking exhaust valves
D. All of the above
[单项选择]Which of the following conditions may be attributed to a fouled turbocharger compressor inlet screen or filter?（）
A. Decreasing scavenge air pressure
B. Increasing exhaust temperatures before the turbine
C. Reduction in engine speed
D. All of the above
[单项选择]Which of the following problems may occur when using fuel oil with a high sulphur content?（）
A. Injection lag
B. Lube oil dilution
C. Pre-ignition
D. Corrosion
[单项选择]Which of the following problems may occur if the clearance between a piston and cylinder liner is insufficient?（）
A. Excessive wear
B. Scuffing of the liner
C. Piston seizure
D. All of the above
[单项选择]Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）
A. The amount of fuel injected will be increased
B. The start of injection will be retarded
C. The nozzle will permit fuel to dribble
D. The spray pattern will be distorted
[单项选择]Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）
A. Injection pressures
B. Control air supply pressure
C. Cooling water flow through after-coolers
D. Lube oil temperature
[单项选择]Which of the following firing order may be used for an 6 cylinder engine?（）
A. 1-2-3-4-5-6
B. 1-2-3-6-5-4
C. 1-5-3-6-2-4
D. 1-3-4-5-6-2
[单项选择]A fire may be spread by which of the following means?（）
A. Conduction of heat to adjacent surfaces
B. Direct radiation
C. Convection
D. All of the above
[单项选择]If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
A. be damaged
B. work normally regardless of harmful conditions
C. not wok though it is not in a bad condition
[单项选择]Which of the following is not a factor which can interfere with the pulse of sound and cause a variation the depth reading?（）
A. salinity
B. temperature
C. the hydrostatic pressure
D. Vessel’s speed
[单项选择]As to the bearing, of the following, which statement is not true?（）
A. ff overheat is found, the engine must be stopped for inspection
B. Much heat of the crankcase door indicates that the bearing is overheated
C. If bearing clearance is too large, knocking will be heard in the crankcase
D. If bearing clearance is too large or too small, the white metal may be melted
[单项选择]As to the piston cooling, of the following, which statement is not true?（）
A. Because the piston is exposed to very high temperature, it must be cooled
B. The lower the piston cooling temperature is, the better it is
C. Both water and lube oil can be used as coolant
D. One of the piston cooling methods is vibration cooling, with better effect
