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单选题
The connecting rod is fitted between the crosshead and the crankshaftI t transmits the firing force, and together with the crankshaft converts the （）motion to a （）motion.
A
rotary；reciprocating
B
up and down；fore and aft
C
fore and aft；up and down
D
up and down；rotary
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单选题Abnormal crankpin bearing and piston skirt surface wear indicate（）A
a restricted air intakeB
a clogged connecting rod oil passageC
incorrect connecting rod alignmentD
high cylinder firing temperatures
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单选题The connecting rob is fitted between the crosshead and the crankshaftIt transmits the firing force, and together with the crankshaft convert the （） motion to a （） motion.A
rotary；reciprocatingB
up and down；fore and aftC
fore and aft；up and downD
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单选题At bottom dead center, the centerline of the connecting rod usually coincides with the（）A
angularity of the piston motionB
inertia moment from the pistonC
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单选题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 rodB
piston rodC
bearing housingD
none of the above
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单选题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 rodB
large end bearingC
the main bearingD
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单选题The small end of the connecting rod is attached to the piston with a （）.A
crankpinB
sliding wedgeC
wrist pinD
torque bashing
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单选题Two rams of the hydraulic gear are linked at their outer ends to （） by a crosshead and swivel block.A
the piston rodB
the tiller armC
the connecting rodD
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考题
单选题Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?（）A
Decreased connecting rod bearing clearanceB
Increased connecting rod bearing clearanceC
Decreased compression ratioD
Increased compression ratio
考题
单选题Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, （）to a maximum as the piston approaches top or bottom dead center and then （） back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.A
accelerates；deceleratesB
accelerates；acceleratesC
decelerates；deceleratesD
decelerates；accelerates
考题
单选题（） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.A
DoorsB
Aspirate gauzerC
CouplingD
Blind
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单选题Doors are generally formed in the （） of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.A
bedplatesB
columnsC
cylinder blocksD
safety caps
考题
单选题An increase in crankcase pressure generally indicates（）A
worn connecting rod bearingsB
worn engine cylinder linersC
high cylinder firing pressureD
stuck spring-loaded manhole covers
考题
单选题The connecting rod is fitted between the crosshead and the crankshaftI t transmits the firing force, and together with the crankshaft converts the （）motion to a （）motion.A
rotary；reciprocatingB
up and down；fore and aftC
fore and aft；up and downD
up and down；rotary
考题
单选题The lower end of each piston rod is reduced in diameter to fit a bore in （）, this being secured to the piston rod by a nut.A
the crank-webB
the connecting rodC
the main bearingD
the cross-head
考题
单选题An acceptable method of measuring for the correct rotational force applied to the connecting rod and main bearing bolts, is to use a（）A
torque wrenchB
monkey wrenchC
pipe wrenchD
slugging wrench
考题
单选题Generally the gudgeon pin is fully floating in both connecting rod small end and （）.A
the crossheadB
the crankshaftC
large endD
the piston bosses
考题
单选题The slippers run （） in the crosshead guides as the piston and rod are （）and prevent the top of the connecting rod from moving sideways.A
up and down；reciprocatingB
up and down；rotatingC
back and forth；reciprocatingD
back and forth；rotating
考题
单选题The lower end of each piston rod is reduced in diameter to fit a bore in （）.A
the crossheadB
the journals of the crossheadC
the crosshead shoesD
the guides
考题
单选题In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）A
build up the piston crown by metal sprayingB
build up the cylinder head by metal sprayingC
insert shims between the crankpin bearing box and the connecting rod footD
install a thinner head gasket
考题
单选题In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.A
reciprocating at the piston pin, rotary at the crank pinB
reciprocating at the crank pin, rotary at the piston pinC
straight reciprocationD
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考题
单选题The outside diameter of the pipe is （） the diameter of the bore of the piston rod, the result being that an annular space formed between the piston rod and the pipe.A
less thanB
greater thanC
equal toD
twice larger than
考题
单选题Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）A
StationaryB
Full floatingC
Semi-floatingD
Free rolling
考题
单选题The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in （）A
increased compression ratioB
decreased compression ratioC
increased bearing clearanceD
decreased bearing clearance
考题
单选题The design of （） is similar to that of the main bearing.A
the block bearingB
the camshaft bearingC
the connecting rod small end bearingD
the connecting rod large end bearing
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