AET 261 Exam 2 Questions With
Answers 100% Solved
How many gallons of air per gallon of gas? - ANSWER 9000
Air filters can be made of - ANSWER Stamped steel, composite
Air filter can trap particles ___ to ___ microns in size - ANSWER 10-25
Air filter restriction indicator for gas engines appears when - ANSWER 15-20in water
Air filter restriction indicator for Diesel engines appears when - ANSWER 20-30 in water
Long runners build - ANSWER Low rpm torque
Short runners build - ANSWER Maximum high rpm tower
Upper manifold, connects lower unit to long passages needed to provide ram effect that
helps engine deliver torque at low engine speeds - ANSWER Plenum
EGR - ANSWER Exhaust gas recirculation
EGR valve allows ____ of exhaust gas to enter intake - ANSWER 5-10%
Exhaust is more effective at reducing NOx If the gas is ______ - ANSWER Cooled
Provide least amount of restriction possible, keep noise at a minimum - ANSWER
Exhaust Manifold needs
Temp of exhaust manifold can exceed - ANSWER 1500 (degrees)
Exhaust manifold materials - ANSWER Cast iron, steel tubing
Make extra noise, make O2s read lean which makes PCM add extra fuel to ratio -
ANSWER Cracked Exhaust manifold
Soothes pressure pulses to reduce noise in exhaust - ANSWER Muffler
Throttle body units are equipped with intake manifolds that keep airflow at - ANSWER
50-300ft (per second)
Separation of air/fuel droplets occur when the manifold velocity drops below - ANSWER
50ft/sec
A leak at the upper end of intake manifold gasket results in a - ANSWER Vacuum leak
Leak at the____ can lead to vacuum leak, but also a coolant or oil leak can occur if
, manifold has coolant flowing through it - ANSWER Lower intake manifold gasket
Measure of how well an engine breathes - ANSWER Volumetric Efficiency
Volumetric efficiency ____ as engine speed increases - ANSWER Decreases
A new engine is about __% efficient - ANSWER 85
The amount of air fuel change introduced into the cylinders - ANSWER Charge density
Uses atmospheric pressure for its intake charge - ANSWER Naturally Aspirated
Boost can be measured in - ANSWER PSI, Bar, ATM
Using an air pump to pack a fender air fuel charge into the cylinders - ANSWER Forced
Induction
When the intake and exhaust valves are both partially open - ANSWER Overlap
An engine driven air pump that supplies more than the normal amount of air into the
intake - ANSWER Supercharger
All the air that enters if forced through the unit - ANSWER Positive displacement
Types of superchargers - ANSWER Root, Centrifugal
A valve that allows air to flow directly into the intake manifold, bypassing supercharger -
ANSWER Bypass Valve
What sensor measures boost pressure? - ANSWER MAP
_____ are usually lubricated with synthetic oil inside the unit - ANSWER Superchargers
Uses the heat of exhaust to power a turbine wheel and doesn't use any engine power -
ANSWER Turbocharger
In normal engine, as much as __% of heat is lost through exhaust - ANSWER 50
How exhaust gases flow from combustion chamber to the - ANSWER Turbine wheel
Trunks contain two chambers, with ____ and ____ - ANSWER Impeller (compressor),and
turbine
When an engine is running at full power, turbo rotates at speeds between - ANSWER
100,000 and 150,000 rpm
Lubricated by engine oil through an oil line to the center bushing assembly - ANSWER
Turbo
Delay between acceleration and turbo boost is called - ANSWER Turbo lag
As boost increases, the air ___ also increases - ANSWER Temp
Answers 100% Solved
How many gallons of air per gallon of gas? - ANSWER 9000
Air filters can be made of - ANSWER Stamped steel, composite
Air filter can trap particles ___ to ___ microns in size - ANSWER 10-25
Air filter restriction indicator for gas engines appears when - ANSWER 15-20in water
Air filter restriction indicator for Diesel engines appears when - ANSWER 20-30 in water
Long runners build - ANSWER Low rpm torque
Short runners build - ANSWER Maximum high rpm tower
Upper manifold, connects lower unit to long passages needed to provide ram effect that
helps engine deliver torque at low engine speeds - ANSWER Plenum
EGR - ANSWER Exhaust gas recirculation
EGR valve allows ____ of exhaust gas to enter intake - ANSWER 5-10%
Exhaust is more effective at reducing NOx If the gas is ______ - ANSWER Cooled
Provide least amount of restriction possible, keep noise at a minimum - ANSWER
Exhaust Manifold needs
Temp of exhaust manifold can exceed - ANSWER 1500 (degrees)
Exhaust manifold materials - ANSWER Cast iron, steel tubing
Make extra noise, make O2s read lean which makes PCM add extra fuel to ratio -
ANSWER Cracked Exhaust manifold
Soothes pressure pulses to reduce noise in exhaust - ANSWER Muffler
Throttle body units are equipped with intake manifolds that keep airflow at - ANSWER
50-300ft (per second)
Separation of air/fuel droplets occur when the manifold velocity drops below - ANSWER
50ft/sec
A leak at the upper end of intake manifold gasket results in a - ANSWER Vacuum leak
Leak at the____ can lead to vacuum leak, but also a coolant or oil leak can occur if
, manifold has coolant flowing through it - ANSWER Lower intake manifold gasket
Measure of how well an engine breathes - ANSWER Volumetric Efficiency
Volumetric efficiency ____ as engine speed increases - ANSWER Decreases
A new engine is about __% efficient - ANSWER 85
The amount of air fuel change introduced into the cylinders - ANSWER Charge density
Uses atmospheric pressure for its intake charge - ANSWER Naturally Aspirated
Boost can be measured in - ANSWER PSI, Bar, ATM
Using an air pump to pack a fender air fuel charge into the cylinders - ANSWER Forced
Induction
When the intake and exhaust valves are both partially open - ANSWER Overlap
An engine driven air pump that supplies more than the normal amount of air into the
intake - ANSWER Supercharger
All the air that enters if forced through the unit - ANSWER Positive displacement
Types of superchargers - ANSWER Root, Centrifugal
A valve that allows air to flow directly into the intake manifold, bypassing supercharger -
ANSWER Bypass Valve
What sensor measures boost pressure? - ANSWER MAP
_____ are usually lubricated with synthetic oil inside the unit - ANSWER Superchargers
Uses the heat of exhaust to power a turbine wheel and doesn't use any engine power -
ANSWER Turbocharger
In normal engine, as much as __% of heat is lost through exhaust - ANSWER 50
How exhaust gases flow from combustion chamber to the - ANSWER Turbine wheel
Trunks contain two chambers, with ____ and ____ - ANSWER Impeller (compressor),and
turbine
When an engine is running at full power, turbo rotates at speeds between - ANSWER
100,000 and 150,000 rpm
Lubricated by engine oil through an oil line to the center bushing assembly - ANSWER
Turbo
Delay between acceleration and turbo boost is called - ANSWER Turbo lag
As boost increases, the air ___ also increases - ANSWER Temp
