更多"The main purpose of changing main e"的相关试题:
[单项选择]The purpose of a main switchboard circuit breakers reverse-power trip is to （）.
A. prevent main circuit overload
B. protect the circuit breaker blowout coil
C. prevent alternator motorization
D. prevent low voltage tripout
[单项选择]The main purpose of starting the diesel engine on air briefly is（）
A. to inspect if the cylinder has the water leakage
B. to expel out the residual water/gas/oil from the cylinder
C. to check if fuel supply is normal
D. A and B
[单项选择]The purpose of engine stand-by is that （）
A. the main engine in the stand-by condition
B. auxiliary machinery in the stand-by condition
C. dynamical equipments in the stand-by condition and could be used immediately
D. A and B
[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]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 main purpose of warming the parts of the main engine is （）
A. to reduce heat stress
B. to reduce low temperature corrosion
C. to improve firing and starting performance
D. fuel saving
[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]The purpose of the flywheel of a diesel engine is to （）.
A. counterbalance the crank throws on the crankshaft
B. keep the engine running smoothly between power stroke
C. provide a belt-driving surface for the operation of auxiliary machinery
D. prevent the engine from overspeeding
[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]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]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]The main purpose of an electric space heater installed in a large AC generator is to （）
A. prevent the windings from becoming brittle
B. prevent moisture from condensing in the windings during shutdown
C. prevent acidic pitting of the slip rings
D. keep the lube oil warm for quick starting
[单项选择]The main purpose of inspection for a running diesel engine is（）
A. testing for the mechanical load and the thermal load
B. inspecting thermal and mechanical condition of the engine
C. inspecting each system and exhaust temperature
D. testing for compress pressure and explosion pressure
[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]The oil index of main engine should be controlled to prevent it from in heavy weather（）
A. over heat
B. over speed
C. over pressure
D. over worn
[单项选择]If keep the fuel injection of main engine unchanged when ship is fouled, that will causeⅠ.The speed of main engine to be reduced Ⅱ.Ship speed to be reduced Ⅲ.The resistance torque of propeller to be increased Ⅳ.Trim at stern to increase（）
A. Ⅰ + Ⅱ
B. Ⅰ ~ Ⅲ
C. Ⅰ ~ Ⅳ
D. Ⅰ + Ⅱ + Ⅳ
