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Diesel Tests 1-2
Terms in this set (100)
The instrument shown in the illustration would be used on a diesel engine to __________. Illustration MO-0031
a.measure cylinder compression or firing pressure
b.balance exhaust gas termperature readings
c.measure exhaust gas pressure
d.measure concentration of chromat in jacket water
If there is a 'clicking' sound in the valve compartment of a diesel engine, the cause may be __________.
a.excessive valve lash
b.a worn wrist pin
c.worn connecting rod bearings
d.all of the above
Before starting a diesel engine that has an engine driven lube oil pump, the operator should __________.
a.open the bypass line
b.cut in the lube oil cooler
c.pressureize the lube oil system with the prelube pump
d.top off the expansion tank
According to the illustrated polar timing diagram for a four- stroke cycle high speed diesel engine, the period of valve overlap occurs for a duration of how many degrees of crank travel? MO-0084
Directional intake ports in diesel engines are used to _______.
a.reduce air charge turbulence
b.induce air swirl
c.deflect hot combustion gas away from the valve
d.oppose the effect of piston induced squish
For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an __________.
c.oil control rings
d.drilled passage through the camshaft
Which of the listed bearing types is an example of a solid bearing?
a.Piston wrist pin bushing
d.Diesel engine main bearing
Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or caps. The installation process of these bearings requires sufficient ________.
c.lap or lead
In a diesel engine, the main bearings are used between the _____________.
a.connecting rod and the crankshaft
b.wrist pin and the connecting rod
c.camshaft and the engine block
d.crankshaft and the engine block
What function is provided by the crankcase ventilation system on some diesel engines?
a.Increases the sludge forming tendency of lube oil.
b.Prevents the accumulation of combustible gases.
c.Improves lube oil cooling.
d.Improves cold weather starting.
In a four-stroke/cycle diesel engine, the camshaft rotates at _____________.
a.twice the crankshaft speed
b.half the crankshaft speed
c.the same speed as the crankshaft
d.a speed independent of the crankshaft
The camshaft on a four-stroke/cycle diesel engine provides a means to operate the _____________.
d.all of the above
The shape of a diesel engine cam determines the ___________.
a.points of opening and closing of the valve
b.velocity of opening and closing of the valve
c.amount of the valve lift from its seat
d.all of the above
What is the crank angle between any two crank throws in the firing order of a four-stroke/cycle, in line, eight cylinder diesel engine?
The linear motion of a diesel engine piston is converted to the rotary motion required to drive gears, propeller shafts, and generators by the _____________.
A viscous damper, as used on a marine diesel, is a sealed precision built device which dampens the torsional vibrations in the _____________.
The diesel engine connecting rod shown in the illustration is classified as a/an __________. (See illustration MO-0010)
b.fork-and-blade type rod
c.articulated type rod
d.primary type rod
The small end of the connecting rod is attached to the piston with a _____________.
Connecting rods in a diesel engine are used to connect the _____________.
a.engine to the bed
b.rocker arm to the camshaft
c.crankshaft to the gear train
d.piston to the crankshaft
Cast iron pistons used in large propulsion diesel engines are constructed with ____________.
a.no taper what so ever
b.the skirt being tapered and smaller than the crown
c.the skirt being tapered and larger than the crown
d.the crown being tapered and smaller than the skirt
The upper section of a piston is called the _____________.
Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?
a.To allow for greater expansion due to higher operating temperature.
b.To seal the cylinder against leakage of combustion gases.
c.To provide an additional surface for oil cooling.
d.To provide additional strength for the crown and lower structure.
The lower section of a piston is called the _____________.
Piston 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
During the power stroke, the side thrust of a trunk type piston is a result of the angle ____________.
a.formed by the connecting rod and the cylinder center line
b.formed by the piston in relation to the piston pin
c.between the crankarm and crankpin
d.between the master and link connecting rods
Barrel face, taper face, grooved, and chrome plated are all types of diesel engine _____________.
Oil control rings are designed with slotted holes to _____________.
a.decrease ring contact area and cut down heat transfer
b.decrease contact pressure between ring and cylinder wall
c.increase contact pressure between ring and cylinder wall
d.permit excess oil to drain back to the sump
What is the average piston speed of a five cylinder low- speed engine with a bore of 29.5 inches (75 cm), a stroke of 63 inches (160 cm), and a rated speed of 123 RPM?
a.645 ft/min (196 m/min)
b.1291 ft/min (393 m/min)
c.2582 ft/min (787 m/min)
d.7749 ft/min (2362 m/min)
Which of the lettered items, shown in the illustration, identifies an oil control ring? (See Illustration MO-0014)
In the diagram shown in the illustration, which segment of the cycle represents compression? (See Illustration MO-0037)
Piston compression rings used in a diesel engine function to ____________.
a.transfer heat from the cylinder to the piston
b.scrape oil from the sides of the piston
c.seal the combustion space from the crankcase
d.prevent any piston contact with the cylinder liner
What is the swept volume per cylinder per revolution of a six-cylinder, two-stroke/cycle diesel engine with a 580 mm bore and a 1700 mm stroke operating at 100 RPM?
a.0.45 cubic meters (450 L)
b.0.90 cubic meters (900 L)
c.2.7 cubic meters (2700 L)
d.5.4 cubic meters (5400 L)
A seven cylinder, 2-stroke/cycle, single acting diesel engine has a 750 mm bore and a 2000 mm stroke. What indicated power will be developed if the average mean effective pressure is 14.8 kg/cm2 at a speed of 96 RPM?
The diesel engine shown in the illustration utilizes the type of cylinder construction identified as ______________. (See Illustration MO-0007)
a.a dry liner
b.a wet liner
c.integral with a removable sleeve
d.integral with a non-removable sleeve
A four cylinder, four stroke/cycle, single acting diesel engine has a 740 mm bore and a 1500 mm stroke. What indicated power will be developed if the average mean effective pressure is 18 kg/cm2 at a speed of 90 RPM?
After a long period of operation, a wear ridge, caused by piston ring action, will develop near the top of the cylinder liner. This ridge must be removed when piston rings are renewed in order to prevent ______________.
a.excessive wear during the seating period
b.excessive lubrication of the top ring
c.improper spreading of lubrication on the cylinder wall
d.breaking of the top ring, ring land, or both
One of the advantages in the use of a dry liner over a wet liner is _____________.
a.it is fitted with neoprene O-ring seals
b.the honing process makes it easier to maintain the desired oil film
c.there is less likelihood of water leaking into the combustion space
d.it fits more loosely due to a decrease in heat transfer through the composite wall
An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with _____________.
Which of the terms listed below represents the operational speed at which excessive engine vibration is created?
d.Design maximum speed.
In the pressure-volume diagram shown in the illustration, curve "A-d" indicates ______. (See Illustration MO-0035)
a.fuel injection after dribble
b.combustion at approximately constant pressure
c.opening of exhaust valves
d.start of fuel injection
The part labeled "F" shown in the illustration, is the _____________. (See Illustration MO-0040)
a.connecting rod cap
b.bearing shell halves
c.connecting rod bushing
d.piston pin bushing
Main populsion diesel engines having a bore exceeding 300 mm are to have at least _______.
a.two independent means of starting the engine
b.five air starting valves to permit the admission of starting air at any crank angle
c.one explosion relief valve at the position of each main crank throw
d.two engine drive lube oil pumps capable of parallel operation
Passages are drilled in the crankshafts of diesel engines to proved lubricating oil to the _____.
b.connecting rod bearings
c.piston pin bushings
d.all of the above
Precombustion chambers and energy cells in high-speed, small bore diesel engines serve to increase ___________.
b.ignition quality of the fuel
c.fuel air ration during compression
Te combustion of fuel for the illustrated engine is intiated by __________.(MO-0020)
a.a spray of fuel into a turbulence combustion chamber
c.fuel from a unit injector
d.individual bosch fuel pumps
the device shown in the illustration is classified as a/an _______?(MO-0008)
a.comparator type mist detector
b.exhaust gas vapor condenser
c.ringleman exhaust gas analyzer
d.reflective type explosion meter
The direct cause of a crankcase explosion can be attributed to ______.
a.overheated scavengin air
b.excessive cooling water temperature
c.an overheated bearing
d.lube oil contamination of the jacket waterC
The parts labled "I" and "II" shown in the illustration are identified respectiveley as the______.(MO-0020)
a.exhaust vavle and intake valve
b.intake vavle and exhaust vavle
c.fuel atomizer valve and exhaust valve
d.starting air valve and intake valve
What is to be installed on an internal combustion engine if its cylender bore exceeds eight inches?
a.crankcase vapor monitor
b.engine exhaust silencers
c.constant pressure turbochanger
d.explosion relief valves
Which of the lettered items show in the illustration identifies an oil control ring?(MO-0014)
The process of supplying a diesel engine cylinder with air at a pressure greater than atmospheric is called __________.
The illustrated device is operated directly by __________. Illustration MO-0041
a.a rocker arm and push rod
b.fuel oil pressure
d.excessively high combustion pressure
In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in __________.
a.increased engine back pressure
b.sufuric acid corrosion
c.surface pitting of the turbocharger compressor blades
d.moisture impingement of the turbocharger compressor blading
In a diesel engine jacket water cooler, with sea water cooling the fresh water, the __________.
a.jacket water pressure should be less than sea water pressure
b.jacket water temperature must always be less than 60°F
c.jacket water pressure should always be greater than sea water pressure
d.sea water temperature must never be warmer than 40°F
The thermostatic valve in the illustration is used for controlling the coolant temperature in a main propulsion diesel engine. Which of the following can be used to verify proper valve operation with the valve disassembled? Illustration MO-0079
a.Check spring compression values against data given in manufacturer's handbook.
b.Chemically analyze contents of power pellet.
c.Place the thermostatic element in a container of water at various operating temperatures and note the movement of the valve stem.
d.Remove and examine the contents of the power pellet
Why will a turbocharged diesel engine produce black smoke if excessive additional load is applied too quickly?
a.exhaust energy would draw excess air
b.the inetia of the turbocharger rotor causes a time lag which delay the tubocharge speed to increase
c.exhaust gas pumping losses are increased due to turbine windage
d.exhaust gas back pressure fall slightly due to increased nozzle action
In a turbocharger, inlet air velocity is increased in the __________.
a.inlet nozzle ring
b.stationary diffuser passages
c.compressor outlet volute
d.rotating impeller vanes
In a Roots-type rotary blower, the volume of air delivered is directly proportional to __________.
d.brake specific fuel consumption
The principal characteristic of an isochronous governor is it will __________.
a.slow the engine down as the load is increased
b.shut down the engine if it overspeeds
c.display excessive speed droop
d.maintain a constant speed with variation of load
The governor, shown in the illustration, will have its preset speed droop altered whenever __________. Illustration MO-0092
a.the compensating lever fulcrum is changed
b.the speed droop lever fulcrum is changed
c.the speeder spring tension is changed
d.all of the above
In a simple hydraulic governor with speed droop, oil under pressure is maintained ready for use in the __________.
c.spring-loaded piston accumulator
d.pressure pilot valve assembly
An auxiliary diesel-generator continues to run after you try to shut down. Your next course of action should be to _________.
a.block the flow of air supply to the engine
b.engage the jacking gear
c.secure the lube oil pump
d.decrease control air pressure
Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires __________.
a.replacing only the plunger
b.grinding the spare plunger to the barrel
c.replacing the plunger and the barrel
d.highly polishing both the plunger and barrel
When a nozzle tester is being used to test a "closed" type fuel injection nozzle, a clogged nozzle orifice will be indicated by a __________.
a.distorted spray pattern
b.chattering sound when the nozzle closes
c.squealing sound midway in the pump stroke
d.popping sound when the nozzle opens
Which of the fuel nozzles listed requires the LEAST maintenance?
Governor hunting is caused by __________.
a.governor under control
b.excessive speed droop
c.insufficient speed droop
d.governor over control
The power output of a turbocharged diesel engine will drop if the cooling water flow through the aftercooler is interrupted because the __________.
b.exhaust pressure increases
c.air charge density decreases
d.scavenge effect increases
When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, you can expect __________.
b.overheating because of slipping shoes
c.chipped reduction gear teeth
d.excessive wear on the thrust bearings
The principal hazard to personnel when using a diesel engine fuel nozzle tester is _______.
The diesel engine shown in the illustration, the exhaust manifold is indicated by the letter __________. Illustration MO-0003
In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the __________.
a.metal particles loosened by wear
b.air when no air cleaners are used
c.condensation of water vapors
d.combustion by products removed from the cylinder walls
The TBN value of diesel engine lube oil refers to its ability to __________.
a.resist changes in viscosity with changes in termperature
d.resist ocidation at temperatures
Which of the following statements is true concerning a main diesel engine oil cooler?
a.The oil temperature is less than the cooling water temperature.
b.The oil pressure is less than the cooling water pressure.
c.The oil pressure is greater than the cooling water pressure
d.The oil flow control valve is always installed in the oil input line.
The desirable properties of a marine fuel oil should include __________.
a.low heating value and high sulfur content
b.low flash point and high viscosity
c.high flash point and high viscosity
d.high heating value and low sulfur content
The cetane number rates fuels for diesel engines according to its __________.
c.rates of vaporization
As shown in the illustration of the fuel injection pump, the function of the area designated as "L" is to __________. Illustration MO-0061
a.relieve excessive injector discharge pressure
b.control the fuel injection rate
c.allow excess fuel oil to return to the fuel oil system
d.proveide the plunger with lubrication
A normally operating diesel engine is shutdown by __________.
a.overspeeding the engine
b.securing the fuel supply
c.shutting of the start air supply
d.securing the ignition system
Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by __________.
a.Water in the fuel
b.insufficinet fuel for combustion
c.clogged air intake filter
d.burning lubricating oil
In an HFO service system, what is the immediate destination of the fuel unconsumed by the main propulsion diesel engine?
a.The unconsumed fuel is recirculated back to the fuel injection pumps suction.
b.The unconsumed fuel is recirculated back to the settling tank.
c.The unconsumed fuel is recirculated back to the mixing tank (if fitted) or to the day tank
d.The unconsumed fuel is recirculated back to the booster pump suction.
A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the ____________.
a.pilot valve opening
b.compensating needle valve
c.compensating spring tension
d.accumulator spring tension
Device "27" shown in the illustration is used to __________. (See Illustration MO-0111)
a.seal the shell when raising vacuum
b.purge the unit of non-condensable gases
c.relieve excess pressure
d.add de-scaling chemicals as needed
What is the function of device "B" shown in the illustration? (See Illustration MO-0110)
a.It serves to heat incoming feedwater.
b.It condenses the vapors formed in section "G".
c.It removes sensible heat from the jacket water.
d.It serves to boil off incoming feedwater.
Temperature control valves installed in the jacket cooling water system of a diesel engine, modulates the rate of water flow through the __________.
a.cooling water pump
b.nozzle cooling passages
A continuous fluctuation of the speed, due to overcontrol by the governor, is known as _____________.
The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to _____________.
a.compensate for low oil level
b.increase governor promptness
c.prevent governor hunting
d.limit engine load
Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?
The ability of the governor to prevent fluctuations in engine speed is termed _____________.
What is the function of item "D" shown in the illustration? (See Illustration MO-0110)
a.It heats the entering feedwater.
b.It heats the jacket water entering the device.
c.It causes the jacket water to evaporate.
d.It condenses the distillate.
Starting systems for large, low-speed, direct reversing, main propulsion diesel engines are usually _____________.
a.hydraulic starting motor
b.electric starting motor
c.direct air admission
d.vane type air motors
In a starting motor equipped with a Bendix drive, the pinion moves and meshes with the flywheel ring gear due to __________.
a.the mechanical linkage
b.the threaded sleeve's rotation
If the load on a diesel engine equipped with an isochronous hydraulic governor is increased, after compensation is performed by the governor, the engine speed will __________.
a.remain the same
Referring to the illustrated motorship fresh water cooling system drawing, what statement is true concerning the evaporator? Illustration MP-CW-06
A. The evaporator uses heat recovered from the jacket water cooler sea water as a heat source to generate fresh water and is piped in series with and prior to the jacket water cooler.
b.The evaporator uses heat recovered from the main engine cooling water as a heat source to generate fresh water and is piped in parallel with the jacket water cooler.
c.The evaporator uses heat recovered from the main engine cooling water as a heat source to generate fresh water and is piped in series with and after the jacket water cooler
d.The evaporator uses heat recovered from the main engine cooling water as a heat source to generate fresh water and is piped in series with and prior to the jacket water cooler
The expansion tank in a diesel engine closed cooling system is designed to _______.
a.reduce the temperature of the water
c.maintain a constant head and allow for thermal expansion.
d.provide an air cushion
The fishing industry factory ship to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. What type of turbo charging configuration is used? Illustration MP-IX-14
a.two stage turbo charging
b.pulse turbo charging
c.constant pressure trubo charging
d.bosst controlled turbo charging
The fuel injector shown in the illustration is opened by fuel pressure acting upward on __________. M)-0059
The part labeled B in the illustration is known as the ______?illustration MO-0065
The river push boat to which you are assigned has diesel generators fitted with intake and exhaust systems as shown in the illustration. What does the component labeled "2" represent? IllustrationMP-IX-06
b.charge air manifold
c.charge air cooler
The sea-going tug to which you are assigned has main engines fitted with intake and exhaustsystems as shown in the illustration. What statement is true concerning the turbocharger charge air discharge arrangements? Illustration MP-IX-08
a.It is not possible to determine the turbocharger charge air discharge arrangements in this particular drawing.
b.The left side turbocharger discharges charge air to the left cylinder bank, and the right side turbocharger discharges charge air to the right cylinder bank.
c.The left side turbocharger discharges charge air to the right cylinder bank, and the right side turbocharger discharges charge air to the left cylinder bank.
d.The left side turbocharger discharges charge air to both cylinder banks, and the right side turbocharger discharges charge air to both cylinder banks.
The unit shown in the illustration is called a/an __________. MO-0041
d.governor relief valve
What is the function of the aftercoolers installed in the diesel engine air intake system?
a.Decrease the air density
b.increasze the exhaust temperature
c.decrease the lube oil temperature
d.increase the air density
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