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WorksheetsAuto Final 1
Total questions: 40
Worksheet time: 3hrs 20mins
The closing of the intake/exhaust valves is performed by the
________________.
Intake Ports
Cam Lobes
Valve Springs
Cylinder Head
What is the purpose of the camshaft?
Open the intake/exhaust valves
Close the intake/exhaust valves
Open and close the intake/exhaust valves
To shaft the cams
The Acronym TDC means...
Telephone Direct Call
Trinidad Digs Chicharrones
Top Dead Center
Timing Done Correctly
During an exhaust stroke, exhaust gases are evacuated from the cylinder past an exhaust valve that ___________.
must be held closed by its valve spring
must be free to travel as designed
leads to an opening to the crankcase
leads directly to atmosphere
What is engine timing?
Choose the best answer
ignition coils firing at the right time
closing the knutter valves at the right time
opening and closing of the valves at the right time
The relationship between the engine mechanical and electrical operations.
The crankshaft turns at what speed compared to the camshaft? Take a careful look at the gears.
Same speed
1/2 Speed
2x Speed
1/1 Speed
Cylinder volume with the piston at bottom dead center (BDC) compared to cylinder volume with the piston at top dead center (TDC) is defined as the:
Compression Ratio
Piston Comparison
Piston Aspect Ratio
Engine Displacement
Technician A states the camshaft opens and closes the valves. Technician B states the crankshaft converts reciprocating force/motion to rotational force/motion. Who is correct?
Tech A
Tech B
Both Techs
Neither Tech
If a camshaft lobe has been worn down due to material failure:
The related valve may stick open
There may be abnormal valve train clatter
Piston-to-valve contact may occur
The cylinder may experience compression loss
Tech A states poor engine maintenance may result in sludged oil. Tech B states allowing oil to deteriorate into sludge may cause severe engine damage. Which tech is correct?
Tech A
Tech B
Both techs
Neither Tech
Tech A states understanding basic sciences and machines provide the foundational skills for engineer only. Tech B states understanding how simple machines are compounded into systems reinforce the skills a tech needs for diagnostics. Who is correct?
Tech A`
Tech B
Both Technicians
Neither Technician
This tool is important when trying to change a tire and other automotive work...
socket
torque wrench
ratchet
clamps
Why should engine cooling systems be "burped" after repairs to the system or service?
air pockets trapped in the system can create overheat conditions
Make the car run faster
It will change color
The coolant will deteriorate after prolonged use
When should a fuel filter be replaced?
At every oil change
Once a Year
An fuel filter should be replaced per OEM guidelines
only if it gets visibly dirty
Which of the following statements are true of the tool pictured?
This tool is recommended from removing fasteners
This tool is used to apply a specific amount of torque to a fastener
This tool is very rugged and does NOT need to be handled with care.
Both A and B are correct
The function of a water pump is:
uses an impeller to force coolant through the engine coolant passages.
stays closed until operating temperature is reached
stores coolant
primary heat exchanger for the vehicle engine
The function of a coolant reservoir is:
uses an impeller to force coolant through the engine coolant passages.
stays closed until operating temperature is reached
stores coolant
primary heat exchanger for the vehicle engine
The function of a thermostat is:
control cooling system temperatures
stays closed until operating temperature is reached, then allows coolant flow
stores coolant
primary heat exchanger for the vehicle engine
Engine electronic control systems require:
magnets, wires, and a battery
relays and contact points
sensors, a processor, and actuators
radio transmitters and receivers
If an engine sensor/circuit sets an OBD2 code:
replace the affected sensor
refer to OEM diagnostic procedures before replacing anything
the engine will seize
the fault must be strictly electronic
Which part is directly responsible for converting 12V energy to kilovolt energy for spark in gasoline engines?
Ignition Coil
Spark Plug
Ignition Lock Cylinder
Glow Plug
From the fuel tank, it sends fuel up the fuel line and into the fuel rail where it can be injected into a cylinder.
Fuel Lines
Fuel Pump
Fuel Pressure Sensor
Fuel Lifters
Why is a spark plug gap important?
A:Because the spark has to jump the gap for ignition
B:Because if the gap is too big, it influences the spark
C:Because if the gap is too small, it influences the spark
All the above A,B & C are correct
Lubricating oil
Minimizes wear in moving parts
Helps in keeping the parts cool
Washes away and carries away dirt
All of the above
Friction reduction in side an engine must be reduced to:
decrease electrical consumption
prevent excess heat generation
increase the load
maintain proper engine timing
The most important property of engine oil is
density
viscosity
thermal conductivity
none of the above
What sensor monitors the rotating speed the engine ?
Mass Air Flow
Camshaft Position Sensor
Throttle Position Sensor
Crankshaft Position Sensor
What is the main function of piston rings in an internal combustion engine?
To supply fuel to the combustion chamber
To ignite the air-fuel mixture
To open and close the valves
To transfer heat from the piston to the cylinder wall
Which component is primarily responsible for maintaining the correct timing between the crankshaft and camshaft?
Oil Pump
Timing Belt/Chain
Alternator
Water Pump
What is the purpose of a fuel injector in a modern gasoline engine?
To mix air and fuel outside the cylinder
To deliver a precise amount of fuel directly into the combustion chamber
To cool the engine
To filter the fuel
What is the primary role of the radiator in an engine cooling system?
To transfer heat from the coolant to the air
To store coolant
To regulate oil pressure
To ignite the air-fuel mixture
Which component is responsible for converting the up-and-down motion of the pistons into rotational motion?
Timing Belt
Crankshaft
Camshaft
Valve Spring
What is the main function of a fuel injector in a modern engine?
To inject fuel directly into the combustion chamber
To cool the engine
To regulate oil flow
To mix air and fuel in the carburetor
What is the main purpose of the engine's oil filter?
To mix air and fuel
To remove contaminants from the engine oil
To cool the engine
To increase oil pressure
Which stroke in a four-stroke engine cycle is responsible for compressing the air-fuel mixture?
Exhaust stroke
Compression stroke
Power stroke
Intake stroke
Which component is responsible for maintaining tension on the timing belt in an engine?
Crankshaft
Timing Belt Tensioner
Camshaft
Oil Pump
What is the primary function of piston rings in an internal combustion engine?
To mix air and fuel
To cool the piston
To seal the combustion chamber and control oil consumption
To open and close the valves
Which of the following is a symptom of a failing water pump in an engine?
Abnormal valve noise
Low battery voltage
Engine overheating
Excessive oil consumption
