单项选择题Which of the listed problems can be a cause of low compression pressure in a diesel engine?()

A.clogged air filter
B.compression stroke
C.burned exhaust valves
D.all of the above


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2.单项选择题Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?()

A.When heated, it will move proportional to the amount the metal has lengthened or expanded
B.The pointer associated with the pyrometer scale can be made to also measure engine RPM
C.It can be utilized in exhaust manifolds and heat exchangers interchangeably
D.It can indicate temperature at a distant point from the source heat

3.单项选择题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?()

A.Low compression pressure and high exhaust temperature
B.Low firing pressure and high exhaust temperature
C.Low compression pressure and low exhaust temperature
D.Low firing pressure and low exhaust temperature

4.单项选择题Excessive valve lash in an auxiliary diesel engine will cause the valves to open()

A.later and close sooner
B.sooner and close later
C.sooner and close sooner
D.later and close later

5.单项选择题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

6.单项选择题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

7.单项选择题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

8.单项选择题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

9.单项选择题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

10.单项选择题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