更多"Which of the following conditions m"的相关试题:
[单项选择]Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）
A. Leaking seal ring
B. Insufficient heat transfer from the exhaust valves
C. Block cooling water passages to the head
D. Excessive scavenging air provided to the engine
[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 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 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 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 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]Which of the following are data layer categories to be displayed on ECDIS（）．
A. ECDIS warnings and messages
B. Hydrographic Office data
C. Notice to Mariners information
D. All of the above
[单项选择]Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）
A. Ignition lag increases
B. Lube oil system pressure increases
C. Brake specific fuel consumption increased
D. Mechanical efficiency increaded
[单项选择]Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?（）
A. Lube oil is diluted and its viscosity is reduced
B. Sulfuric acid is formed
C. Bearings become pitted ad immediately fail
D. Valve stems develop sludge deposits
[单项选择]Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）
A. An alarm device with audible and visible signals is required for all cooling water systems
B. Propulsion engines with bores over 200 mm are to be fitted with cooling water jackets
C. Each totally enclosed cooling system shall be provided with a suitable head tank
D. Drain cocks are to be provided at the lowest points of all cylinder water jackets
