Integral water jacket
liners use O-rings near the bottom of the liner. These O-rings serve to
______________./prevent the escape of lubricating oil from the crankcase
Improper cooling of a
diesel engine cylinder liner due to the accumulation of scale deposits, may
cause _____________./increased piston wear
The most severe
cavitation erosion occurring on the
waterside of diesel engine wet cylinder liners normally occurs ____________./near the middle of the
thrust side of the liner
A crack in a cylinder
liner can be caused by _____________./restricted cooling water passages
In a diesel engine, a
cylinder liner should be replaced ifit is ______________.I. scuffedII.
scored/II only is correct
In a diesel engine, an
integral liner is one in which thecooling water __________. I. flows through the cylinder liner
jackets II. touches the outer side of
the liner/I only
The cylinder liner
forming the cylinder wall and the inside of the water jacket is called a _____________./wet
liner
The purpose of
counterboring the top of the cylinder liner, extending down to the top point of
travel of the top compression ring, is
to _____________./prevent wear of the liner from forming a ridge at the upper
level of ring travel
Why are some diesel
engine cylinder liners plated on the wearing surface with porous
chromium?/Pores in the plating aid in maintaining the lube oil film.
A properly honed diesel
engine cylinder liner will ________./shorten the ring break-in period
The lower water seal on a
diesel engine wet cylinder liner must allow for liner axial movement. This seal
is most commonly a
_____________./neoprene O-ring
Which of the diesel
engine cylinder liners listed has
internal cooling water passages?/Integral water-jacket liner.
The lower water seal on a
diesel engine wet cylinder liner must allow for liner expansion and
contraction. This seal is most commonly
a _____________./neoprene O-ring
It is easier to replace a
dry cylinder liner than a wet one because ____________./water seals are not
required
One advantage of dry
cylinder liners used in a diesel engine is the _____________./procedure to
replace dry liners is simpler than for wet liners
One of the advantages in
the use of a dry liner over a wet liner is _____________./there is less
likelihood of water leaking into the
combustion space
In certain cases, a
cylinder liner can be refinished rather than replaced. When properly honed, the
_____________./liner surface should have a crosshatch pattern
A properly honed diesel
engine cylinder liner will ________./shorten the ring break-in period
Which of the following
statements concerning cylinder liner wear in a single acting diesel engine is
correct?/Excessive liner wear causes wear between piston rings and grooves.
Generally, where should
you expect to find the greatest amount
of wear on a cylinder liner?/Opposite the top ring shortly after piston travel
has ended the compression stroke.
The rate of wear on a
cylinder liner depends on the
_____________./all of the above
A scored diesel engine
cylinder liner will cause __________./rapid wearing of piston rings
Which of the following
statements concerning cylinder liner wear is true?/Excessive liner wear causes
wear between piston ring and groove.
Scuffed cylinder liner surfaces
in a diesel engine can result from
______________./operating an overheated engine
Which of the following
operations will have a direct impact on the rate of wear in a cylinder liner
____________./quality of fuel injected
Scuffed cylinder liner wearing
surfaces in a diesel engine can result from _____________./applying load to a
cold diesel engine
Scuffed cylinder liner
wearing surfaces in a diesel engine can result from _____________./operating
the engine overheated
What is to be installed
on an internal combustion engine if its cylinder bore exceeds eight
inches?/Explosion relief valves
An inline engine having a
nine inch bore and more than eight cylinders will _________./have three
explosion relief valves
Cylinders diameters
greater than 230 mm require additional safety devices when the scavenging
spaces are openly connected to the
cylinders. Which of the following devices will be used to protect such
spaces?/Explosion relief valves
What is required for
crosshead type engines that have a
scavenging space in open connection to the cylinder?/The scavenging
space is to be permanently connected to an approved fire extinguishing system,
entirely separate from the fire extinguishing system of the engine room.
Engine displacement is
equal to the cylinder _____________./area times the stroke, times the number of
cylinders
Successful combustion
inside the cylinders of a diesel engine
is dependent upon _____________./all of the above
Turbulence in a diesel
engine cylinder is of major importance
in providing _____________./complete fuel/air mixing
In a full floating
wristpin, the pin is prevented from
sliding against the cylinder walls by _____________./snap rings
Individual cylinder
performance in a diesel engine is
routinely determined by exhaust gas _____________./pyrometer readings
Persistent knocking in
one cylinder of an eight cylinder diesel engine would MOST likely be caused by
_____________./a badly worn piston pin
Combustion knock can
occur in the cylinders of a diesel
engine under any condition permitting _____________./excess fuel in the
combustion chamber
Excessive diesel engine
cylinder exhaust back pressure will be
caused by _____________./an obstruction in the exhaust silencer
Which of the listed
designs is effectively used to provide the turbulence necessary for proper
combustion in a diesel engine cylinder?/Precombustion chamber
The highest pressure in a
diesel engine cylinder normally occurs _____________./after TDC
Turbulence is created in
the cylinders of a diesel engine to _____________./help mix fuel and air
A diesel engine indicator
diagram has an area of 22 cm2 and a length of 12.5 cm. If the scale of the
indicator spring is 1 mm = 1 kg/cm2, what is the cylinder mean effective pressure?/17.6 kg/cm2
Forcing the exhaust gases
from the cylinder of an operating diesel engine with the aid of a blower is
known as ________./scavenging
The process of supplying
a diesel engine cylinder with air at a pressure greater than atmospheric is
called _________./supercharging
A diesel engine indicator
diagram measures 12.5 cm in length and has an area of 22 cm2. What is the
cylinder mean effective pressure if the
spring used has a scale of 1.25 mm equals 1 kg/cm2?/22.0 kg/cm2
Using a diesel engine
indicator P-V diagram, the cylinder mean effective pressure is calculated to be
21.3 kg/cm2. What is the scale of the spring used on the indicator if the
diagram area is 18.46 cm2 with a length of 13 cm?/1.5
The bore of a diesel
engine cylinder describes the ________./inside diameter of the cylinder
By comparing the exhaust
gas output of each cylinder of a diesel engine, one method of determining if
the engine load is balanced is by the use of a ______________./pyrometer
By comparing the exhaust
gas output of each cylinder of a diesel engine, one method of determining if
the engine load is balanced is by the use of a ______________./pyrometer
Which of the following
statements represents the reason for rolling over a diesel engine with the
cylinder indicator cocks open prior to starting?/To ensure foreign material
(water etc.) is not present in the cylinders.
Cylinder linings
constructed as an integral part of the
block, are characterized by which of the following disadvantages?/They cannot be replaced.
Wear is usually greatest
at the top of the cylinder bore of a diesel engine due to the
____________./highest pressures being exerted
For a diesel engine,
individual cylinder performance is
commonly determined by exhaust gas _____________./pyrometer readings
Which of the listed
diesel engine systems is likely to
create the problem of a cylinder regularly misfiring?/Fuel
Water accumulation in the
cylinder of a secured engine is an indication that the _____________./cylinder
liner may be cracked
Which of the listed
conditions will affect the mean
effective pressure the most in the cylinders of a diesel
engine?/Completeness in the mixing of the fuel and air
The greatest turbulence
in a diesel engine cylinder is created
by the _____________./shape of the combustion chamber |
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1 comments:
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diesel engine spare parts
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