更多"Precision engine bearing inserts ar"的相关试题:
[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]Ring groove inserts are occasionally used on aluminum alloy piston to（）
A. reduce the ring groove wear rate
B. seal against crankcase vapors
C. lessen the wear on aluminum part of the cylinder
D. allow for the greater expansion rate of aluminum
[单项选择]Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A. low oil pressure
B. high coolant pressure
C. leaking fuel injector
D. cracked cylinder head or liner
[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]A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.
A. as much fuel as
B. less fuel than
C. less fuel as
D. more fuel than
[单项选择]Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.
A. to stiffen
B. to soften
C. to loosen
D. to wear
[单项选择]（） the engines, the diesel engine is（） used engine on board.
A. Between；more commonly
B. Among；the most commonly
C. Between；not more commonly
D. Among；not the most commonly
[单项选择]The piston rings are manufactured with a diameter （） the bore of the cylinder.
A. larger than
B. smaller than
C. equal to
D. none of the above
[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]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]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]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]You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）
A. large dirt particles in the oil supply
B. insufficient lubricating oil and overheating
C. normal wear
D. water contamination of the lube oil
[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]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]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
