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单选题
There is a support ring between the cylinder block and collar of the cylinder liner, thus carrying both the liner and the cylinder coverIt also passes to the cooling bores and to the cover（）
A
cooling water
B
cooling oil
C
refrigerant
D
lubricate oil
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One cylinder of a diesel engine is persistently knocking and does not cease(停止) when the fuel supply to that cylinder is secured.Which of the following problems may be the cause?A.Low loading of the cylinderB.Excessive cooling of that pistonC.Sluggish ring action on the pistonD.A mechanical defect in a working part
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单选题The （） chamber is enclosed between the cylinder head and piston.A
lubricationB
injectionC
coolingD
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单选题In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）A
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is going downward；piston ring beltC
is coming upward；piston ring beltD
is going downward；cylinder ring belt
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单选题In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and grooveA
(1) only is correctB
(2) only is correctC
both (1) and (2) are correctD
neither (1) or (2) axe correct
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单选题Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）A
has a crown-faceB
exceeds wear limits through normal wearC
has excessive blow-byD
is in good condition
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单选题In some designs the cylinder oil is timed so that the oil injects only on the （）.A
piston crownB
piston grooveC
piston skirtD
piston ring belt
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单选题Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between （）.A
crown and skirtB
liner and jacketC
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jacket and block
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单选题In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.A
piston crownB
piston ring grooveC
piston skirtD
piston ring area
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单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）A
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faulty combustion in that cylinderC
sluggish piston ring actionD
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单选题For any piston ring to operate smoothly without scuffing ,the ring must be （）.A
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properly lubricatedC
prevented from compressingD
prevented from rotating during engine operation
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单选题An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with（）A
graphite packingB
sealing compoundC
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单选题Which of the following statements is/are true regarding hydraulic pumps in general? （）A
Variable volumes can be obtained with gear pumps only by variation of the pump drive speedB
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The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plateD
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单选题For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.A
cylinder casingB
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crankcase doorD
aperture in the cylinder block
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单选题Which of the following statements concerning cylinder liner wear is true?（）A
Liner wear is distributed equally between the upper and lower portions of the cylinderB
Excessive liner wear causes wear between piston ring and grooveC
Excessive, but uniform liner wear will not cause wear between piston ring and grooveD
Liner wear is normally greatest in the middle of the cylinder
考题
单选题If the piston ring gap remains insufficient when installing new rings, youshould（）A
install oversized ringsB
hone the cylinder liner to allow ring installationC
compress the rings tighter with a compressing toolD
file the ends of the rings
考题
单选题A-frames are mounted on the bed plate and support （） and cylinder block.A
the main bearingB
the cylinder coverC
the entablatureD
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单选题The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.A
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upwards；outwardsC
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单选题In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveA
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Ⅱ only is correctC
both Ⅰ and Ⅱ are correctD
neither Ⅰ or Ⅱ are correct
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单选题If the back clearance of a piston ring is excessive,（）A
compression pressure in the cylinder will be higherB
carbon will accumulate behind the ringC
combustion gases will penetrate beneath the ring landD
piston side thrust will be increased
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单选题A metal ring on the bottom of a block，to which the standing part of a tackle is spliced，is known as a(n)（）.A
becketB
loopC
swivelD
eye
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单选题A properly honed diesel engine cylinder liner will（）A
prevent piston ring wearB
shorten the ring break-in periodC
prevent cylinder liner glazingD
appear slick and glazed
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