單項(xiàng)選擇題In a four-stroke cycle diesel engine the intake valves open ()

A.before TDC and close after BDC
B.after TDC and close after BDC
C.before TDC and close before BDC
D.after TDC and close before BDC


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1.單項(xiàng)選擇題Diesel engine air start system check valves are opened by ()

A.an air start cam
B.cylinder compression pressure
C.starting air pressure
D.valve springs

2.單項(xiàng)選擇題For a diesel engine, individual cylinder performance is commonly determined by exhaust gas()

A.chemical analysis
B.back pressure readings
C.pyrometer readings
D.infrared analysis

3.單項(xiàng)選擇題Low compression pressure in a diesel engine may be the result of ()

A.insufficient fuel supply due to fuel pump valves sticking or leaking
B.excessive mechanical clearance between the piston crown and cylinder head
C.excessively worn fuel pump plunger
D.excessive exhaust back pressure

4.單項(xiàng)選擇題Exhaust gas pyrometers are useful for()

A.detecting faulty combustion in individual cylinders
B.adjusting fuel racks to maintain equal loading between cylinders
C.adjusting the load limit setting of the governor at idle conditions
D.calculating engine horsepower

5.單項(xiàng)選擇題A connecting rod in a four-stroke/cycle diesel engine is subject to()

A.tension load twice each crankshaft revolution
B.compression load during power and compression strokes
C.inertia load once every four crankshaft revolutions
D.bending loads at bottom and top dead center

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