更多"A large, low-speed, main propulsion"的相关试题:
[单项选择]On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）
A. dial indicator
B. outside caliper
C. bridge gauge
D. tram rod
[单项选择]In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）
A. top of the ring groove
B. back of the ring groove
C. bottom of the ring groove
D. piston ring end clearance
[单项选择]Stating a large propulsion diesel engine using diesel fuel during cold weather conditions can be made easier by （）
A. increasing the quantity of starting air
B. increasing the lube oil pressure
C. heating the engine fuel supply
D. heating the engine jacket water
[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]On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.
A. a spindle lubricator
B. an oil jet
C. internal splashing
D. drilled passages in the crankshaft
[单项选择]Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.
A. decreased fuel consumption per brake horsepower
B. more complete cylinder scavenging
C. extended valve life
D. carbon formation on combustion chamber surfaces
[单项选择]In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）
A. governor droop
B. speeder spring tension
C. fuel rack lag
D. load on the engine
[单项选择]Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）
A. decrease the time required between cleanings
B. removes all large and small foreign objects
C. ensure a positive flow of oil at all times
D. ensure that all lube oil has been treated twice
[单项选择]In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）
A. Bed plate
B. Column
C. Entablature
D. Tie rod
[单项选择]The main propulsion diesel continues running after you try to shut downYoushould now attempt to（）
A. stop the combustion air supply
B. engage the jacking gear
C. secure the lube oil pump
D. shut off the fuel at the day tank
[单项选择]Cast iron pistons used in large propulsion diesel engines are constructed with （）
A. not taper what so ever
B. the skirt being tapered and smaller than the crown
C. the skirt being tapered and larger than the crown
D. the crown being tapered and smaller than the skirt
[单项选择]When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）
A. starting air pressure
B. scavenge air pressure
C. over-speed trip
D. banjo oiler line
[单项选择]Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.
A. wheelhouse control station
B. engine room control station
C. captains office
D. chief engineers office
[单项选择]Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）
A. increasing the quantity of starting air
B. increasing the lube oil pressure
C. heating the engine fuel supply
D. heating the engine coolant
[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]Crankcase explosions in propulsion diesel result from（）
A. the splashing of lubrication oil by the crankshaft
B. the dilution of crankcase oil with particles of combustion
C. broken fuel lines spraying oil on the crankcase
D. the ignition of unburned fuel and air in the crankcase
[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
