Level 2 test 1
Diesel Engine Performance Quiz
Test your knowledge on diesel engine performance with this comprehensive quiz comprising 71 questions!
Covering various aspects of diesel technology, the quiz includes:
- Turbocharger Mechanics
- Exhaust Emissions
- Fuel Properties
- Oil and Lubrication Systems
Which component in diesel fuel solidifies as ambient temperature decreases
Paraffin
Sulphur
Hydrocarbons
Cetane
Winter diesel fuel has ___________ than summer fuel
More sulphur
A higher cloud print
Less heat value
A lower cetane rating
What is the difference between bio-diesel and ultra-low sulfur diesel
Bio-diesel is a blend of diesel and soybean oils and cheaper to manufacture
There is no difference except that more sulphur is removed from bio diesel
Bio-diesel has a gel point slightly higher than ultra low sulphur diesel
Ultra low sulphur diesel has reduced sulphur and bio diesel does not
A pyrometer is used to
Identify exhaust pollutants
Check exhaust back pressure
Measure exhaust temperature
Measure exhaust velocity
What should a technician do to find the source of excessive oil in the exhaust system of a naturally aspirated engine?
Remove the intake manifold and check for traces of oil
Pressurize the lubrication system with injectors removed
Remove the exhaust manifold and check for a smoky cylinder
Feel the exhaust manifold at each cylinder to locate the hottest one
When does the turbocharger waste gate allow bypass of exhaust gases?
When too much fuel is injected into the cylinder
When turbocharger boost pressure is too great
When turbocharger oil pressure gets too high
When turbine speed is too low
What step is performed after installing a turbocharger?
Listen for turbo noise with a stethoscope while the engine idles
Crank the engine with the fuel off till there is oil pressure
Check the turbine impeller operation by spinning it with shop air
Start the engine with the drain line removed to ensure oil flow
Black soot around exhaust pipe connections indicates
Normal conditions for diesel engines
There is a restriction in the exhaust system
That there is an exhaust leak
Excessive white smoke from the exhaust of a diesel engine during normal operation is an indication of
Coolant leaking into a cylinder
Advanced injection timing
Engine oil leaking past an intake valve seals
Restrictions to air flow by the filter
The cause of blue exhaust smoke from a diesel engine is the result of
Air inlet restriction
Coolant entering the combustion chambers
Worn oil control rings
Cylinders mis firing
One possible cause of black smoke could be
Turbo seals leaking oil into the intake
High intake manifold pressures
A lack if exhaust back-pressure
A loose connector at the turbo air discharge
If engine crankcase pressure is too high, the first thing to check for is
Worn piston oil control rings
A plugged engine breather
A faulty turbocharger
A blown head gasket
In a naturally aspirated engine, what force causes air to enter the cylinder during the intake stroke
Piston suction
Piston pressure
Atmospheric suction
Atmospheric pressure
The purpose of an air inlet restriction indicator is to indicate when
The turbo is not providing enough air flow
It is time to service the muffler
There is an air flow restriction in the intake manifold
It is time to service the air filter
When does an engine equipped with a roots blower develop maximum air box pressure
At maximum engine load
At curb idle
At maximum engine rpm
During uphill grades
An intercooler will cool the
Intake air before it enters the turbo
Exhaust gas before it enters the turbo
Intake air after it leaves the turbo
Exhaust gas after it leaves the turbo
When checking air inlet restriction of a turbocharged engine it should be operated at
High idle no load
Half throttle no load
Low idle full load
Rated rpm, full load
To check for air inlet restriction, the guage should measure in
Inches or millimeters of water (h20)
Bar or kilopascals
Inches or millimeter of mercury (hg)
Pounds per square inch or kilograms per square centimetre
Turbocharger boost pressure will be greatest when the engine
Throttle is moved quickly to full throttle
Is decelerating
Is operating at high idle
Is operating under full load
When shutting down a turbocharged engine after it has been under load
Run at full throttle for maximum oil flow
Allow it to idle for at least five minutes
Check that the operating temperature is not too high then shut down
Listen for the turbo to wind down before shutting off
What will be the result of an externally plugged air to air after cooler
Turbocharger damage
White exhuast smoke
Black exhaust smoke
Back pressure in the exhaust system
An engine oil with a viscosity index improver additive would
Maintain a more consisten viscosity through a range of temperatures
Be able to neautralize acids formed in it by the combustion process
Disperse sludge and other solid contaminates better than regular oil
Have a higher viscosity rating
SAE 5W30 engine oil acts like
5w oil during the winter and 30 oil during the summer
5w oil when it is cold and 30 oil when it is hot
5w oil when it is new and 30 oil when it is due to be changed
30 oil when it is cold and 5w oil when it is hot
To prevent engine bearing damage due to acid forming in the crankcase an oil must have
Anti rust agents
Detergents and disperants
Oxidation inhibtiors
Tbn addictives
What is the system called that filters all of the engine oil before delivering it to the bearings?
Full film system
Full flow system
Boundary system
Bypass system
The micron rating of a filter indicates
How much filter material is in the filter
The length of time the filter will last
The minimum size of particles it will trap
The size of the threads in the housing
Which operating condition is most likely to use a scavenge pump in the lubrication system
Working below sea level
Cold weather operation
Working on a hillside
High altitude operation
Which oil filter is more likely to be a depth-type
Full flow
Bypass
Canister
Spin on
One cause of low oil pressure could be
Fuel dilution of the oil
The pumps relief valve is stuck closed
A new oil pump that is not broken in yet
The oil viscoisty index is too high
What happens if a full flow oil filter becomes restrictred
The pressure differential valve allows oil to bypass the filter
The oil pressure in the system will drop
Oil will continue to flow to the engine bearings but not the rocker shaft
The pump pressure relief valve will vent oil pressure to the sump
Which of the following would not be the cause of engine oil loss on a highway truck
Cracked oil cooler
Restricted exhaust
Worn out air compressor
Leaking turbo seals
What is the result of an engine oil cooler that is leaking internally
There will be coolant in the oil but no oil in the coolant
The engine oil pressure will increase
The oil will become darker in colour
There will be coolant in the oil and oil in the coolant
When an engine oil analysis indicates higher than normal levels of copper, which component would be at fault
Valve guides
Oil filter
Oil cooler
Main bearings
Oil used to lubricate the engine must be changed on a regular basis due to
Breakdowns of the petroleum base
Its darker color
Breakdown of its additives
Plugging of the oil filter
The most important reason to have the engine at operating temperature before draining the oil is so
The oil drains quicker
The oil filter is eaiser to remove
Contaminants become suspended in the oil
Engine components are well lubricated
SAE classifies engine oil according to its
Ability to lubricate
Viscosity
Pour point
Service application
On diesel enginees with two fuel filters the primary filter is usually located between the
Fuel tank and fuel transfer pump
Injectors and the fuel return line
Injection pump and the injectors
Fuel pump and the injection pump
When a fuel filter becomes clogged it will cause
A fuel knock during acceleration
A reduction of fuel flow to the injection pump
Fuel system back pressure to seat the check valve at the primary filter
The fuel to flow throught the filter bypass valve
During fuel filter change most diesel engine manufactures now recommend to
Leave the engine running while changing the filter
Install the filter without filling it then prime the system
Which modification is made to open nozzle fuel system, when the fuel tank is moved to a position above the injectors
Back-pressure restrictor fitting is removed
Check valve installed in the fuel return line
Primary filter seal is changed to pressure type
Excess flow valve installed in the fuel supply line
The function of the fuel transfer pump in a diesel engine is to
Deliver fuel to the main pump
Pressurize the fuel and deliver it to the injectors
Return fuel to the fuel tank
Time the fuel injection and meter the fuel
When using an inperial outside micrometer turning the thimble one full revolution will move the spingle ______ of an inch
0.025
0.050
0.100
0.250
In all diesel engines the fuel is ignited by heat
Generated from the air passing through the intake manifold
From the friction of moving parts
Created by the cooling system
From the air in the cylinder being compressed
Which statement is true of a diesel engine operating at full throttle
Maximum horsepower and maximum torque occur at rated speed
Maximum horsepower at rated speed and maximum torque above rated speed
Maximum horsepower at rated speed and maximum torque below rated speed
Maximum horsepower at high idle and maximum torque at rated speed
In four stroke cycle engines the exhaust stroke occurs before the _______ stroke
Compression
Intake
Power
Outlet
In a four stroke cycle engine, the camshaft rotates at ______ speed
Twice crankshaft
Crankshaft
Half crankshaft
Quarter crankshaft
A four cylinder four stroke cycle engine has a firing order of 1-3-4-2 if number 1 cylinder is on the intake stroke what stroke is number 3 cylinder on
Compression
Exhaust
Power
Intake
A four cylinder four stroke cycle engine running at 3000rpm will deliver a total of _____ power strokes per minute
1500
3000
6000
12,000
A six cylinder four stroke engine has a firing order of 1-5-3-6-2-4 if number 1 piston is at tdc of the power stroke when will number 6 cylinder fire
90* after number 1 cylinder fires
180* before number 3 cylinder fires
90*before number 5 cylinder fires
360* after number 1 cylinder fires
An inline six cylinder two stroke cycle engine has how many degrees of rotation between firing pulses
60
90
120
160
Valve overlap is the
Position of the valves in the cylinder head
Total degrees of duration the intake valve is open during the compression stroke
Distance the valves extend into the combustion chamber when they are closed
Total degrees of duration when both the intake and exhaust valves are open
A six cylinder engine has a piston displacement of 41 cubic inches per cylinder. The clearance volume of each cylinder is 5 cubic inches. What is the compression ratio?
8:2:1
9:2:1
10:2:1
12:5:1
Where is brake horsepower measures
At the output of the transmission
Inside the combustion chamber
The the vehicles wheels
At the fly wheel
Which principle of thermodynamics is involved when the heat of combustion is transmitted through a cast iron block
Conduction
Radiation
Evaporation
Convection
What is the reason for pressurizing a cooling system
Reduce the formation of rust and scale
Raise the boiling point of the coolant
Prevent air from entering the system
Provide positive feed for the water pump
What is another term for the heat exchanger used in a vehicles cooling system
Fan
Thermostat
Radiator
Pressure cap
A pressurized cooling system requires a /an
Radiator de-aeration line
Expansion tank and a pump make up line
Positive displacement water pump
Radiator cap with a vaccum valve
What would create a milky white apparance of the engine oil
Dirt in the oil
Fuel contamination
Oil additive depletion
Coolant contamination
Operator compalins coolant is being blown out of radiator and exhaust gas seems to be getting into coolant. What is the most likely cause
Head gasket
Incorrect rad cap
Liner seal
Water pump seal
To check for leakage at the lower seals of a wet liner
Pressurize the crankcase and check for bubbles in the coolant
Remove the oil pan and pressurize the cooling system
Remove the liner and visually inspect the seals
Pressurize the cylinder and check for bubbles in the radiator
After flushing out the cooling system what would be the recommended procedure to fill it
Fill the cooling system from the bottom and leave it for 15 min in. A vaccum to remove air
Start the engine and after the normal operating temperature has been reached check the coolant lever
Refill the system with soft clean water and run for 15 min with thermostat open
Close all drain cocks refill with water and coolant while venting air from coolant passages
When a radiator is reverse flushed the flushing gun should be connected to the
Water distrubting tube arrangement
Outlet side of the water pump
Upper radiator tank opening
Lower radiator tank opening
To clean a cooling system that has been contaminated with oil the system would be flushed with a mixture of water and
Anti freeze
Laundry soap
Petroleum based solvent
Dishwasher detergent
What will happen if the air supply to the shutter stat becomes plugged
Shutter would remain open
Shutter would remain closed
Temperature guage would not work
Engine wolud overheat
When filling a drained truck engine with coolant air may be trapped
In the pump
Below the thermostat
Above the thermostat
In the radiator
What would be the result of using a coolant that does not have the recommended condtioners in it
Water pump seal leakage
Liner seals will deteriorate
High coolant temperatures
Wet liner cavitation
Radiator shutter should open
After the thermostat opens and before the fan clutch engages
Before the thermostat opens and before the fan clutch engages
After the thermostat opens and after the fan clutch engages
Before the thermostat opens and after the fan clutch engages
Following an engine overheat how are cylinder head cooling passages checked for cracks
Circulate boiling water through the head and watch for leaks
Remove the injector tubes and pressurize the head with steam
Pressurize the head with air then submerse it in hot water
Fill the head with a special dye then heat it in an oven
The engine is suspected of burning coolant. What is the most likely cause
Inter cooler fins damged
Cracked EGR cooler
Pressure cap stuck closed
Air to air cooler leaking
A v belt is designed to
Operate in only one direction of rotation
Ride on the sides of the pulley
Last longer if kept as tight as possible
Ride in the bottom of the pulley
The purpose of the bypass circuit in the cooling system is to allow water to circulate when the
Thermostat is open
Thermostat is closed
Engine is idling
Pump is operating
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