49The ability of a fuel particle to travel into the combustion chamber before burning is called _____________.
A.penetration

B.permanence

C.turbulence

D.atomization


A.penetration



50.Theoretical perfect combustion in a diesel engine yields by-products of _____________.

A.aldehydes and carbon dioxide

B.water vapor and carbon monoxide

C.nitrogen and carbon monoxide

D.water vapor and carbon dioxide


D.water vapor and carbon dioxide

51The function of the window cast into the housing of an individual jerk pump is to ____________.

A.allow the pump to be timed to the engine

B.check for sludge on the pump barrel

C.check that the fuel return passages are clear

D.set up the fuel rack calibration in cubic millimeters

A.piston relief groove

52The piston gudgeon pin used in some diesel engine pistons is prevented from contacting the cylinder wall by a __________.

A.piston relief groove

B.piston pin cup

C.snap ring

D.bronze bushing

C.snap ring

53Turbulence in a diesel engine cylinder is of major importance in providing _____________.
A.proper fuel metering

B.complete fuel/air mixing

C.minimal fuel penetration

D.proper fuel timing

B.complete fuel/air mixing

54The load is always placed on the lower half of the main bearings in a/an ____________.

A.two-stroke/cycle engine

B.four-stroke/cycle engine

C.reverse cycle engine

D.double acting engine

A.two-stroke/cycle engine

55Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the waterside of the _____________.

A.fuel nozzle holders

B.exhaust valve guides

C.engine cylinder liners

D.engine exhaust manifold

C.engine cylinder liners

56The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the ____________

A.method of supplying air

B.cooling system

C.method of igniting fuel

D.valve operating mechanism

C.method of igniting fuel

57Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?
A.Stationary
B.Full floating

C.Semi-floating

D.Free rolling

B.Full floating

58Compared to other fuel injection systems, unit injectors operate with virtually no _____________.

A.injection lag

B.ignition delay

C.moving parts

D.control

A.injection lag

59Piston cooling fins are located _____________.

A.on top of the piston crown

B.underneath the piston crown

C.at the base of the piston skirt

D.inside the cylinder liner cooling water jacket.

B.underneath the piston crown

60.A properly honed diesel engine cylinder liner will ________.

A.prevent piston ring wear

B.shorten the ring break-in period

C.prevent cylinder liner glazing

D.appear slick and glazed

B.shorten the ring break-in period

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