單項選擇題Pyrometers commonly found on diesel engine exhaust systems, consist of（）

A.pyrostats and a voltmeter
B.a gas-filled bellows, a tube and a pressure gauge
C.thermocouples and a voltmeter
D.ammeters and thermocouples


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1.單項選擇題Low compression in a diesel engine can be caused by （）

A.clogged coolant passages
B.a leaking cylinder head gasket
C.low fuel oil pressure
D.worn or broken cylinder liner sealing rings

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.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