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单选题
Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）
A
To allow for greater expansion due to higher operating temperature
B
To seal the cylinder against leakage of combustion gases
C
To provide an additional surface for oil cooling
D
To provide an additional strength for the crown and lower structure
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更多 “单选题Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）A To allow for greater expansion due to higher operating temperatureB To seal the cylinder against leakage of combustion gasesC To provide an additional surface for oil coolingD To provide an additional strength for the crown and lower structure” 相关考题
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I'm sure Harry will remember, but why not give him a ring ________ he forgets?A in the caseB in case ofC in caseD in the case of
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In a diesel engine, when refitting piston rings you should ①check the ring gap at the smallest diameter of the cylinder ②remove carbon from the ring grooveA.①B.②C.①②D.neither ① nor ②
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In a diesel engine, when refitting piston rings you should______. I. check the ring gap at the smallest diameter of the cylinder II. remove carbon from the ring grooveA.I onlyB.II onlyC.both I and IID.neither I nor II
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These products are inferior to those we bought last year.A: poorer than
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B.orbit
C.weight
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______ we shall bend this material intoa ring is not yet decided.A.Which
B.Where
C.Why
D.Who
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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
is coming upward；cylinder ring beltB
is going downward；piston ring beltC
is coming upward；piston ring beltD
is going downward；cylinder ring belt
考题
单选题The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.A
sea waterB
scavenging airC
lubricating oilD
fuel oil
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单选题Which method listed below is acceptable by classification society to perform hose testing to weather tight hatch covers and closing appliances（）A
This is to be carried out at a maximum distance of 1,5m with a hose pressure not less than 2,0 kgf/cm2. The nozzle diameter is not to be less than 12mm.B
This is to be carried out at a maximum distance of 1,5m with a hose pressure not less than 3,5 kgf/cm2. The nozzle diameter is not to be less than 5mm.C
This is to be carried out at a maximum distance of 1,5m with a hose pressure not less than 4,0 kgf/cm2. The nozzle diameter is not to be less than 8mm.D
This is to be carried out at a maximum distance of 2,0m with a hose pressure not less than 2,0 kgf/cm2. The nozzle diameter is not to be less than 12mm.
考题
单选题In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring grooveA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ nor Ⅱ
考题
单选题The diameter of a piston is usually less at the crown than at the skirt, in order to （）.A
facilitate the installation of piston ringsB
allow for the expansion of the piston during operationC
prevent crankcase vapors from entering the combustion chamberD
reduce wearing of the upper cylinder liner
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单选题A section of the river that is narrower than usual and is often navigable from bank to bank is a（）.A
chuteB
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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
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单选题Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）A
Low viscosity indexB
Low carbon forming tendenciesC
High film strengthD
High non-corrosive qualities
考题
单选题A: I love your skirt. It’s so beautiful on you! B: ______A
Thank you! It’s just an ordinary skirt.B
Oh, really? Do you like it? I bought it in Yunnan.C
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Oh, no. Your dress looks more beautiful than flay skirt.
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单选题The capacity of a centrifugal pump can be increased by the installation of a larger diameter impeller Another means of increasing the pump capacity is to （）.A
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考题
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
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piston ring grooveC
piston skirtD
piston ring area
考题
单选题For any piston ring to operate smoothly without scuffing ,the ring must be （）.A
of a material harder than the cylinder linerB
properly lubricatedC
prevented from compressingD
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单选题A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?（）A
The diameter of a disc is the same as the outer diameter of the pipeB
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A butterfly valve comprises a disc and a ring bodyD
The profile of the butterfly valve is a ring body
考题
单选题In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）A
compression strokeB
suction strokeC
expansion strokeD
exhaust stroke
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
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greater thanC
equal toD
twice larger than
考题
单选题Cast iron pistons used in large propulsion diesel engines are constructed with （）A
not taper what so everB
the skirt being tapered and smaller than the crownC
the skirt being tapered and larger than the crownD
the crown being tapered and smaller than the skirt
考题
单选题Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）A
faulty combustionB
excessive ring temperatureC
over lubricationD
all of the above
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单选题I'm sure Harry will remember, but why not give him a ring（）he forgets?A
in the caseB
in case ofC
in caseD
in the case of
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单选题The writer gives the example of the egg to _____.A
tell us that eggs are easy to breakB
show how to wear a seat beltC
show why it’s important to wear a seat belt in a carD
tell us what a skateboard is
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