C12 EXAM QUESTIONS & ANSWERS
What would be a typical maximum intake restriction specification for a naturally
aspirated diesel engine? - answer -15 inches of h2o
Which of the following is the best described method of checking out an air filter between
service intervals? - answer -test with a manometer
What component rotates in the compressor housing of a turbocharger? - answer -
impeller
Which of the following does most to define how fast a turbocharger rotates? - answer -
exhaust gas heat
What is the critical flow area inside the turbine housing of a turbocharger known as? -
answer -volute
What should be used to measure the radial play of a turbine shaft? - answer -dial
indicator
Which of the following steps must be performed after installing a reconditioned
turbocharger? - answer -prime the turbo oil circuit
After running a diesel engine under heavy load, how long should the engine be idled
before shutdown? - answer -five minutes
What is used to cool an air to air charge air cooler? - answer -ram air
Which of the following specs is the usual start-test spec when testing an air to air boost
air heat exchanger? - answer -30 psi
Which of the following is an example of a tuned diesel engine exhaust manifold? -
answer -pulsed manifolds
When the unison ring in a vairable nozzle type turbocharger is moved, which of the
following changes? - answer -vane pitch
Which sound dampening principle is based on sound waves being reflected back
toward their source? - answer -resonation
In a sound absorption type muffler, what is sonic energy converted to? - answer -
friction then heat
What is the housing containing the muffler, catalytic converters, scr and dpf known as? -
answer -exhaust gas aftertreatment center
,Which of the following would be a typical operating temperature of a diesel engine
oxidizing converter? - answer -900 degrees celsius
Which of the following operating conditions is more likely to cause a diesel engine,
catalytic converter to plug? - answer -light load, cold temperature operation
Which of the following best describes the role of an egr system on a current diesel
engine - answer -dilutes the intake charge
What happens when a wastegate actuator is in its default position? - answer -all
exhaust gas is routed through the turbine housing
Tech a says that a vg turbo functions like a small turbo when engine loads are light.
Tech b says that a vg turbo functions like a large turbo when engine output is high.
Whos right? - answer -both a and b
Which of the following statements best describes how egr functions to reduce nox
emisions? - answer -reduces oxygen intake to the engine
Which type of valve configuration is more likely to be used with quiescent combustion
technology? - answer -parallel port
When a turbo charger is setup to impact drive torque to the crankshaft, which of the
following terms describes the system? - answer -compound turbocharging
What term do ddc use to describe their compound turbocharger on dd-series engines? -
answer -axial power turbine
Technician a says that a dd axial power turbine apt uses a constant geometry turbine
principle. Technician b says that ddc claim their apt can add over 100 hp to engine
output potential. Who is correct? - answer -technician a only.
What is property insurance and how does it work? - answer -first party insurance that
protects one home and other possessions. Indemnifies owner of property.
Intangible product
What are the 4 requirements of property insurance? - answer -utmost good faith
(ultimate trust on both sides)
Fortuitous (chance, covers sudden/accidental loss)
Indemnity (if covered-put someone back to the same situation they were in prior to the
loss)
Insurable interest (need to care about asset- have financial interest)
What are the 5 elements of a basic contract? - answer -1. An agreement
2. Between legally capable parties
3. For a consideration
, 4. Demonstrating intent
5. To do something that is legal
What are 3 additional items of an insurance contract? - answer -indemnity
Insurable interest
Utmost good faith
Who is covered under property insurance? - answer --person (people)=
Spouse
Relatives living at the insured's residence
Students living away from home (under 21 and in your care)
-business
-leinholder (third party)
Mortgager
Concurrent causation - answer -multiple perils that lead to a loss
One peril may be covered, one may not
Ex. Lightning hits home and a fire starts which creates hole in the roof that causes water
damage. Water damage is excluded but in this case it would be covered because it was
the peril lightning (covered) that caused the water damage
Automatic reinstatement - answer -after loss occurs the insured's limits are restored to
the original amount during the policy period
Proximate cause - answer -the initial cause of claim
(ex. During a concert firecracker is thrown around in the audience causing a person to
go blind- the first person who threw it is the cause of the loss)
Warranty - answer -statement/stipulation in an insurance policy that restrict coverage
specifically regarding the use, condition, or maintenance of the insured property, if
breached will nulify contract
Ex.
Alarm warranty
Backwater valve warranty
Woodstove warranty
Pose challenges for insurers, as often court will side with insured
Contra proferentem - answer -if there are any grey areas/confusing legalities/ambiguity
in a contract then it is against the person that wrote the contract as they had the
opportunity to make it clear
What would be a typical maximum intake restriction specification for a naturally
aspirated diesel engine? - answer -15 inches of h2o
Which of the following is the best described method of checking out an air filter between
service intervals? - answer -test with a manometer
What component rotates in the compressor housing of a turbocharger? - answer -
impeller
Which of the following does most to define how fast a turbocharger rotates? - answer -
exhaust gas heat
What is the critical flow area inside the turbine housing of a turbocharger known as? -
answer -volute
What should be used to measure the radial play of a turbine shaft? - answer -dial
indicator
Which of the following steps must be performed after installing a reconditioned
turbocharger? - answer -prime the turbo oil circuit
After running a diesel engine under heavy load, how long should the engine be idled
before shutdown? - answer -five minutes
What is used to cool an air to air charge air cooler? - answer -ram air
Which of the following specs is the usual start-test spec when testing an air to air boost
air heat exchanger? - answer -30 psi
Which of the following is an example of a tuned diesel engine exhaust manifold? -
answer -pulsed manifolds
When the unison ring in a vairable nozzle type turbocharger is moved, which of the
following changes? - answer -vane pitch
Which sound dampening principle is based on sound waves being reflected back
toward their source? - answer -resonation
In a sound absorption type muffler, what is sonic energy converted to? - answer -
friction then heat
What is the housing containing the muffler, catalytic converters, scr and dpf known as? -
answer -exhaust gas aftertreatment center
,Which of the following would be a typical operating temperature of a diesel engine
oxidizing converter? - answer -900 degrees celsius
Which of the following operating conditions is more likely to cause a diesel engine,
catalytic converter to plug? - answer -light load, cold temperature operation
Which of the following best describes the role of an egr system on a current diesel
engine - answer -dilutes the intake charge
What happens when a wastegate actuator is in its default position? - answer -all
exhaust gas is routed through the turbine housing
Tech a says that a vg turbo functions like a small turbo when engine loads are light.
Tech b says that a vg turbo functions like a large turbo when engine output is high.
Whos right? - answer -both a and b
Which of the following statements best describes how egr functions to reduce nox
emisions? - answer -reduces oxygen intake to the engine
Which type of valve configuration is more likely to be used with quiescent combustion
technology? - answer -parallel port
When a turbo charger is setup to impact drive torque to the crankshaft, which of the
following terms describes the system? - answer -compound turbocharging
What term do ddc use to describe their compound turbocharger on dd-series engines? -
answer -axial power turbine
Technician a says that a dd axial power turbine apt uses a constant geometry turbine
principle. Technician b says that ddc claim their apt can add over 100 hp to engine
output potential. Who is correct? - answer -technician a only.
What is property insurance and how does it work? - answer -first party insurance that
protects one home and other possessions. Indemnifies owner of property.
Intangible product
What are the 4 requirements of property insurance? - answer -utmost good faith
(ultimate trust on both sides)
Fortuitous (chance, covers sudden/accidental loss)
Indemnity (if covered-put someone back to the same situation they were in prior to the
loss)
Insurable interest (need to care about asset- have financial interest)
What are the 5 elements of a basic contract? - answer -1. An agreement
2. Between legally capable parties
3. For a consideration
, 4. Demonstrating intent
5. To do something that is legal
What are 3 additional items of an insurance contract? - answer -indemnity
Insurable interest
Utmost good faith
Who is covered under property insurance? - answer --person (people)=
Spouse
Relatives living at the insured's residence
Students living away from home (under 21 and in your care)
-business
-leinholder (third party)
Mortgager
Concurrent causation - answer -multiple perils that lead to a loss
One peril may be covered, one may not
Ex. Lightning hits home and a fire starts which creates hole in the roof that causes water
damage. Water damage is excluded but in this case it would be covered because it was
the peril lightning (covered) that caused the water damage
Automatic reinstatement - answer -after loss occurs the insured's limits are restored to
the original amount during the policy period
Proximate cause - answer -the initial cause of claim
(ex. During a concert firecracker is thrown around in the audience causing a person to
go blind- the first person who threw it is the cause of the loss)
Warranty - answer -statement/stipulation in an insurance policy that restrict coverage
specifically regarding the use, condition, or maintenance of the insured property, if
breached will nulify contract
Ex.
Alarm warranty
Backwater valve warranty
Woodstove warranty
Pose challenges for insurers, as often court will side with insured
Contra proferentem - answer -if there are any grey areas/confusing legalities/ambiguity
in a contract then it is against the person that wrote the contract as they had the
opportunity to make it clear
