更多"Piston No2 of main engine has been "的相关试题:
[单项选择]If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）
A. inspection covers should not be opened until the engine has cooled
B. ventilation system should be continued in operation for one hour for cooling
C. scavenge pump should be immediately secured to prevent loss of lube oil
D. explosion covers should be opened slightly to provide extra ventilation
[单项选择]When reentering an engine room that has been flooded with CO2, the investigating team should initially（）.
A. leave the access door partially open
B. enter from the lowest level
C. enter from the highest level
D. attempt to operate machinery
[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]Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A. open the bypass line
B. cut in the lube oil cooler
C. pressurize the lube oil system
D. top off the expansion tank
[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]When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are（）
A. operational
B. open
C. closed securely
D. at middle position
[单项选择]When an engine is starting and has got a sufficiently high speed, say about 20 rpm,（）
A. the starting air supply is cut off and fuel is injected into the cylinders
B. the fuel feeding is cut off and the turning gear is put in
C. the starting air supply is cut off and turning gear is taken out
D. the electric blower is shut down and fuel is injected into the cylinders
[单项选择]The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
A. method of supplying air
B. cooling system
C. method of igniting fuel
D. valve operating mechanism
[单项选择]Engine room fires have been started by neglected oil leaks dripping on to hot pipes or exhaust manifolds （） insulation has not been replaced after maintenance.
A. which
B. when
C. whose
D. what
[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]Under manoeuvring condition the main engine may run on （）.
A. gas oil
B. marine diesel oil
C. residue oil
D. crude oil
[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]Your ARPA has been tracking a target and has generated the targets course and speed.The radar did not receive a target echo on its last two scans due to the weather.What should you expect under these circumstances（）.
A. The ARPA will generate data as if the target was still being tracked by radar
B. The ARPA will give an audible and/or visual lost target alarm
C. The ARPA will generate data based on sea return echoes from the vicinity where the target was lost
D. The ARPA has lost all memory of the target and must recompute the target data
[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]The construction of the main propulsion engine lube oil sump should （）
A. have no plating joints of 90
B. retain the lube oil as long as possible before it recirculates through the system
C. provided drain/return lines that are no greater than 24 inches from the pump suction
D. be provided with only a perfectly horizontal bottom
[单项选择]If a main propulsion diesel engine hunts excessively at idle speed, you should （）
A. adjusts the idle speed control
B. drain and flushes the governor and replace the oil
C. adjusts the compensating needle valve
[单项选择]The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）
A. Faulty thermostatic bypass valve
B. Eroded zinc pencils in the heat exchanger
C. Steam formation in the expansion tank
D. Excessive leakage from jacket water pump seal
[单项选择]Large crosshead type engine generally has two lubrication systems, a function performed only by crankcase oil system is（）
A. lubricating
B. cooling
C. cleaning
D. neutralizing
