單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the()

A.cooling water leaving each cylinder
B.fuel oil entering the injector
C.exhaust gases at various locations
D.lube oil at the bearing supplies

4.單項選擇題Low compression pressure in a diesel engine is caused by()

A.low water in the expansion tank
B.improperly seated valves
C.low fuel oil pressure
D.worn or broken cylinder liner sealing rings

5.單項選擇題A pyrometer is an instrument used to measure the temperature of the diesel engine()

A.exhaust
B.fuel oil
C.cooling water
D.cylinder liner