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 groove

A．①

B．②

C．①②

D．neither ① nor ②

[单选题]For a diesel engine, when the piston is at the （）, the clearance volume is the largest.A . TDCB . DTCC . BDCD . DBC

[单选题]On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.A . thrust blockB . sounding rodC . connecting rodD . push rod

[单选题]For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.A . the cylinder coverB . the bottom of bed-plateC . the sumpD . the crankcase door

[单选题]_____ the engines, the diesel engine is ____ used engine on boardA．Between / more commonlyB．Among / the most commonlyC．Between / not more commonlyD．Among / not the most commonly

[单选题]The heart of the diesel engine is the （） where the fuel is burnt and the power developed.A . crankcaseB . cylinderC . scavenge boxD . pisto

[单选题]The diesel engine is a type of （）.A . turbine engineB . gas turbineC . steam engineD . internal combustion engine

[单选题]F．or a continuous operation diesel engine, a duplex filter unit would be the best arrangement becauseA．changing filter elements would not interrupt engine operationB．filtering occurs twice in each pass of oil through the systemC．clogging will not occ

[单选题]In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?A．Noise coming from that air starting valveB．Continuous operation of the starting air compressorC．Zero air pressure in the air starting

[单选题]D．iesel engine blow-by is the leakage of combustion gases past the( ).A．oil rings onlyB．compression and scraper ringsC．cylinder liner sealingD．cylinder liner ring grooves

[单选题]A diesel engine is similar to a gasoline engine except that the former has no （）.A . cross-headB . cylinderC . connecting rodD . spark plug