更多"The main bearing metal is a lining "的相关试题:
[单项选择]Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）
A. increase
B. decrease
C. remain the same
D. increase on compression decrease on expansion
[单项选择]To determine the main bearing clearance of a propulsion diesel engine, you should measure the main bearing shell using a ball anvil outside micrometer and measure the crankshaft journal using a/an （）
A. telescoping
B. ring ‘snap’ gauge
C. inside vernier caliper
D. outside micrometer
[单项选择]Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）
A. bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversed
B. bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversed
C. the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine
D. two-stoke/cycle diesel engines require more complicated lubrication piping
[单项选择]A main bearing consists of two shells which are secured by means of studs and （）.
A. tie rods
B. through bolts
C. lead wires
D. bearing caps
[单项选择]The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）
A. main bearing shells
B. main bearing
C. steel
D. bearing metal
[单项选择]The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion.
A. flange
B. flash
C. plate
D. sheet
[单项选择]Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or capsThe installation process of these bearings requires sufficient （）.
A. overlap
B. crush
C. lap or lead
D. protrusion
[单项选择]Abnormal crankpin bearing and piston skirt surface wear indicate（）
A. a restricted air intake
B. a clogged connecting rod oil passage
C. incorrect connecting rod alignment
D. high cylinder firing temperatures
[单项选择]The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）
A. the rotate speed fluctuation
B. the ventilation tube clogged
C. the main engine accelerate so fast
D. stormy waves
[单项选择]The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the （） caused by the friction at the bearings.
A. acids
B. additives
C. heat
D. gear
[单项选择]Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）
A. Stationary
B. Full floating
C. Semi-floating
D. Free rolling
[单项选择]The connecting rod large end bearing shell generally has tags for location and oil grooves round the center of its axial length which correspond with grooves in the （） through which oil is transmitted up the rod to lubricate the small end.
A. connecting rod
B. piston rod
C. bearing housing
D. none of the above
[单项选择]The bearing cap and shell are replaced and tightened up until （）.
A. the “ nip ”is zero
B. the “ nap ” is zero
C. the “ gap ”is correct
D. the “ clearance ” is correct
[单项选择]The design of the connecting rod large end bearing is similar to that of the mainbearings Whats the meaning of "that" in the sentence above?（）
A. the connecting rod
B. large end bearing
C. the main bearing
D. the design
[单项选择]To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the （）
A. lube oil temperature at the cooler outlet
B. lube oil strainer magnets bearing
C. lube oil temperature
D. lube oil pressure to the bearing
[单项选择]A thrust bearing is used with a propulsion diesel engine to （）.
A. control axial movement of the crankshaft
B. transmit engine thrust to the propeller shaft
C. absorb vibrations in the propeller shafting
D. prevent propeller thrust from being transmitted to the hul
[单项选择]Because of the high loads the bearing material is a tin- aluminum alloy bonded to a steel shellThe crosshead pin is highly polished to a （）.
A. flat surface
B. mirror finish
C. sloping surface
D. inclined surface
[单项选择]The most crucial time for any bearing with regards to lubrication is （）
A. during low loads
B. after proper oil viscosity is reached
C. during starting
D. after cleaning filters
[单项选择]Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）
A. corrosion fretting
B. insufficient lubrication
C. abnormal wear
D. fatigue failure
