网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.
A
the camshaft
B
the flange
C
the ridge
D
the bulge
参考答案
参考解析
解析：
暂无解析
更多 “单选题On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.A the camshaftB the flangeC the ridgeD the bulge” 相关考题
考题
Each cylinder is closed at the top by a _____, made of a special heat-resistant steel.A.cylinder linerB.coupling flangeC.cylinder coverD.piston crown
考题
Because the timing of injection is crucial, _____ mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.A.gearsB.ramsC.barrelsD.cams
考题
第一组Older loop scavenged engines may have a single injector mounted centrally in the cylinder head. Because the exhaust valve is in the center of the cylinder head on modern uniflow scavenged engines the fuel valves (2 or 3) are arranged around the periphery of the head. The pressure at which the injector operates can be adjusted by adjusting the loading on the spring. The pressures at which the injectors operate vary depending on the engine, but can be as high as 540 bar. Some injectors have internal cooling passages in them extending into the nozzle through which cooling water is circulated. This is to prevent overheating and burning of the nozzle tip. Injectors on modern engines do not have internal cooling passages. They are cooled by a combination of the intensive bore cooling in the cylinder head being close to the valve pockets and by the fuel which is re-circulated through the injector when the follower is on the base of the cam or when the engine is stopped. As well as cooling the injector, re-circulating the fuel when the engine is stopped keeps the fuel at the correct viscosity for injection by preventing it from cooling down. Fuel injectors must be kept in good condition to maintain optimum efficiency, and to prevent conditions arising which could lead to damage within the cylinder. Injectors should be changed in line with manufacturers recommendations, overhauled and tested. Springs can weaken with repeated operation leading to the injector opening at a lower pressure than designed. The needle valve and seat can wear which together with worn nozzle holes will lead to incorrect atomization and dribbling.Modern uniflow scavenged engines have______.A.a single injector mounted in the center of the cylinder headB.several injectors mounted around the external boundary of the cylinder headC.a single injector mounted at the external boundary of the cylinder headD.several injectors mounted in the center of the cylinder head
考题
The main factor which determines the output of each cylinder is _____.A.the cylinder weightB.the cylinder boreC.the cylinder lengthD.the cylinder cover
考题
单选题In each cylinder cover there are two or three holes for （）A
the exhaust valvesB
the fuel valvesC
indicator cocksD
the fuel pumps
考题
单选题Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）A
jam in the most worn part of the cylinder when the rings expandB
break in the most worn part of the cylinder when the rings expandC
wear eccentrically on the side opposite the end gapD
overheat and jam at the top center on the combustion stroke
考题
单选题Fix the fuel injector into （） after repair.A
the cylinder linerB
the cylinder coverC
the cylinder jacketD
the piston
考题
单选题A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）A
feel the high pressure fuel lineB
check the cylinder exhausts for white smoke frequentlyC
check the cylinder exhaust temperatureD
isolate each cylinder and inspect the injector
考题
单选题Blow-off of the relief valves of the main cylinders during operation indicates （）.A
the cylinder cover is crackedB
the injector holes is cloggedC
the cams are not properly setD
fuel pump is leaking
考题
单选题When fuel is injected late into a diesel engine cylinder,（）.A
the exhaust will be clearB
fuel consumption will be lowC
all the fuel will be burned at top dead centerD
fuel consumption will be high
考题
单选题In each cylinder cover is a large central opening for mounting （）A
the indicating cockB
the starting valveC
air inlet valveD
the exhaust valve
考题
单选题In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should be taken off and the piston should be （）.A
craned outB
rolled outC
lifted outD
turned out
考题
单选题The most practical way of detecting an overload in one cylinder of an operating large, low-speed ,main propulsion diesel engine is to （）A
check the cylinder exhausts for black smokeB
listen for combustion knock in that cylinderC
isolate each cylinder and inspect the injectorD
check the cylinder exhaust temperature frequently
考题
单选题For Vee-form engines, （） is shaped to given two slopping surface on which （） are placed at the correct relative angle to each other.A
the bottom of the column；the cylinder blocksB
the top of the column；the cylinder headsC
the top of the column；the cylinder blocksD
the bottom of the column；the cylinder heads
考题
单选题Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.A
cylinder linerB
coupling flangeC
cylinder coverD
piston crown
考题
单选题The joint face between the cylinder cover and the liner is arranged （）the combustion process as possible.A
such far away fromB
such near byC
as far away fromD
as near by
考题
单选题（）during the last repair?A
Did you have No.4 cylinder repairB
Do you have No.4 cylinder repairedC
Didn’t you have No.4 cylinder repairingD
Didn’t you have No.4 cylinder repaired
考题
单选题A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）A
excessive cylinder lubricationB
a lugging engineC
a leaking cylinder linerD
overloading of one cylinder
考题
单选题On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）A
cooling jacketB
cylinder linerC
piston crownD
cylinder cover
考题
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 waterB
cooling oilC
refrigerantD
lubricate oil
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
the sump
考题
单选题The cylinder covers and the liners are bolted together by means of （）.A
bolts welded into the cylinder headB
bolts welded into the cylinder framesC
studs screwed into the cylinder headD
studs screwed into the cylinder frames
考题
单选题Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）A
increase engine powerB
increase engine loadC
decrease engine powerD
improve fuel economy
考题
单选题A piston is said to be at top dead center when it is （）A
opening the exhaust portsB
placed on top of the engine along its centerlineC
farthest from the cylinder headD
nearest to the cylinder head
考题
单选题Diesel engine cylinder head test cocks are used to （）A
check cylinder lubricationB
connect the pressure indicator pressureC
test cylinder headsD
connect the exhaust gas pyrometers
热门标签
最新试卷