更多"Each cylinder liner on the marine m"的相关试题:
[单项选择]Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）
A. The expansion tank should be topped off
B. The thermostatic water regulating valves should be manually opened
C. The fuel filters should be changed
D. The engine should be turned over slowly with the indicator cocks open
[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]On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）
A. Engine is hard to start
B. Engine misses
C. Surges at governed RPM
D. Coolant temperature is too low
[单项选择]The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.
A. two-stroke
B. four-stoke
C. long-stroke
D. short-stroke
[单项选择]Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.
A. lead
B. forged steel
C. alloy steel
D. aluminum alloy
[单项选择]The crankshafts of medium speed engines are almost invariably solid （） from a single piece of steel.
A. forged
B. cast
C. made
D. shrunk
[单项选择]The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of （） rpm.
A. below 300
B. above 1200
C. between 300 to 1200
D. below 1200
[单项选择]Crankshafts of medium speed engines are （） from a single piece of steel.
A. unusually solid welded
B. never be solid forged
C. almost invariably solid forged
D. almost invariably be welded
[单项选择]Most medium and slow speed diesels are started by what medium?（）
A. Electric starting motors
B. Hydraulics
C. Compressed air
D. Ether
[单项选择]Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.
A. higher；reduced
B. higher；increased
C. lower；reduced
D. lower；increased
[单项选择]
In a medium speed diesel engine, a trunk type piston may be cooled by（）
Ⅰ.oil circulation though passages in the piston crown
Ⅱ.heat transfer through piston rings and liner wall
A. Ⅰ only
B. Ⅱ only
C. either Ⅰ or Ⅱ
D. neither Ⅰ or Ⅱ
[单项选择]In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.
A. inefficiency
B. oiliness
C. detergency
D. purity
[单项选择]Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear（）
A. must churn the oil in the sump
B. is connected to the propeller shaft
C. is driven at the highest RPM
D. compensates for alignment variations between the engine and pinion gear
[单项选择]One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）
A. crankcase
B. cylinder head
C. valve cover
D. engine frame
[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 bore of each cylinder is formed in a liner which can be （） when worn out.
A. welded
B. replaced
C. drilled again
D. bored
[单项选择]ENG1及ENG2的反推使用（）
A. ENG1用SYSA及SYSB
B. ENG2用SYSA及备用
C. ENG1用sysA及备用
D. ENG2用SYSA及SYSBC
[单项选择]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.
A. apparent slip
B. tree slip
C. pitch
D. propulsive efficiency
[单项选择]Which of the listed cylinder liner surface conditions indicates proper lubrication?（）
A. Dull black appearance
B. Bright appearance
C. Thin layer of lacquer
D. Thick oily film
