更多"Under manoeuvring condition the mai"的相关试题:
[单项选择]Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）
A. formation of carbon on the intake and exhaust ports
B. high water jacket temperatures
C. overheated pistons and cylinders
D. an increase in lube oil viscosity due to fuel dilution
[单项选择]Diesel engine exhaust temperatures may be used to indicate （）.
A. leaking exhaust valves
B. an overloaded cylinder
C. a clogged injector nozzle
D. all of the above
[单项选择]Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）
A. an insufficient speed droop setting
B. an overloaded engine
C. clogged drain holes in the oil control rings
D. complete combustion
[单项选择]Excessive diesel engine back pressure may be an indication of （）
A. carbon buildup in the exhaust manifold
B. overcooling of the exhaust manifold
C. eroded muffler baffle plates
D. high injection pressure
[单项选择]Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability.Which of the key points would only require an alarm sensor?（）
A. Lube oil pressure and temperature
B. jacket water pressure and temperature
C. Engine over-speed
D. Lube oil sump level
[单项选择]Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.
A. clearance
B. crush
C. pitch
D. thrust
[单项选择]The main purpose of changing main engine to electronic controlled is not to（）
A. control fuel injection time more precisely
B. control fuel injection rate more precisely
C. meet the environmental requirements
D. meet high engine speed requirements
[单项选择]In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.
A. metal particles loosened by wear
B. air when no air cleaners are used
C. condensation of water vapors
D. breakdown of the lubricating oil by dilution
[单项选择]If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
A. at each control station
B. in the chief engineer’s quarters
C. in the captains quarters
D. All of the above are correct
[单项选择]Permitting a diesel engine fuel oil day tank to run dry can cause （）
A. overheated injection pumps
B. water condensation in the cylinders
C. fuel dilution of the lube oil
D. air in the fuel system
[单项选择]Defective governor in a diesel engine may lead to （）.
A. smoky exhaust
B. starting failure
C. ignition relay
D. over speed
[单项选择]Low compression pressure in a diesel engine may be the result of （）
A. insufficient fuel supply due to fuel pump valves sticking or leaking
B. excessive mechanical clearance between the piston crown and cylinder head
C. excessively worn fuel pump plunger
D. excessive exhaust back pressure
[单项选择]If a diesel engine is smoking excessively under load, the cause could be （）
A. low exhaust back pressure
B. early fuel injection in one of the cylinders
C. compression pressure in one of the cylinders
D. plugged injector holes
[单项选择]The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.
A. crack
B. knocking
C. leaking
D. seizure
[单项选择]Cold weather starting of a diesel engine may be made easier by（）
A. decreasing the compression ratio
B. using a special fuel having a high ignition temperature
C. increasing the starting air supply
D. heating the jacket water
[单项选择]The diesel engine must be started before it can run by it self For this purpose （） has to be used.
A. a starting system
B. the starting air
C. a starting operation
D. A, B and C
[单项选择]Proper operation of the main engine reduction gear set requires the operation to monitor （）
A. the sump oil level
B. oil flow sight glasses
C. bearing temperatures
D. all of the above
[单项选择]If the main engine starting consecutively failed （） times, it should be found the cause before another starting.
A. 2
B. 3
C. 4
D. 5
[单项选择]Low compression of diesel engine may result from （）
A. a worn cylinder
B. broken piston rings
C. any of A and B
D. none of the above
