更多"Which of the following conditions m"的相关试题:
[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 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]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 operational conditions will occur to the diesel engine lube oil at extremely high temperature?()
A. The oil oxidizes and forms carbon deposits
B. The viscosity increases
C. Engine oil consumption decreases
D. Lubricating qualities of the oil are enhanced
[单项选择]Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?()
A. Air will enter the cooling system
B. Carbon will plug the water cooled exhaust manifolds
C. The jacket water temperature will rise
D. The lube oil viscosity will increase
[单项选择]Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?()
A. faulty combustion
B. excessive ring temperature
C. over lubrication
D. all of the above
[单项选择]Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?()
A. Water discharging from the water outlet of the lube oil purifier
B. Fuel oil discharging from the water outlet of the lube oil purifier
C. Lube oil discharging from the water outlet of the lube oil purifier
D. A change in the lube oil viscosity
[单项选择]Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?()
A. Clogged air intake falters
B. Piston blow-by
C. A defective after-cooler
D. Faulty exhaust valves
[单项选择]Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?()
A. The mixture is too lean to burn
B. The mixture is too rich to burn
C. The vapor is about to explode
D. Conditions are perfect for combustion
[单项选择]Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?()
A. Excessive piston blow-by to the manifold
B. Insufficient cooling water flow
C. Accumulated water in the air boxes
D. Clogged air intake filters
[单项选择]Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?()
A. Increased suction head pressure
B. Decreased feedwater temperature
C. Pump recirculating line being open too much
D. Excessive feedwater temperature
[单项选择]Which of the following conditions can cause excessive lube oil consumption in a diesel engine?()
A. Low lube oil temperature
B. Dirty lube oil strainer
C. Low lube oil pressure
D. High lube oil temperature
[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 operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?()
A. Decreased connecting rod bearing clearance
B. Increased connecting rod bearing clearance
C. Decreased compression ratio
D. Increased compression ratio
[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 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 could be a cause of excessive fuel dilution of diesel engine lube oil?()
A. Leaking fuel injectors
B. Lower than normal compression
C. Delayed fuel injection
D. All of the above are correct