Engine performance Exam 1 UPDATED
ACTUAL Questions and CORRECT
Answers
All overhead valve engines ________. - CORRECT ANSWER - Have the overhead valves in the
head
An SOHC V8 engine has how many camshafts? - CORRECT ANSWER - Two
Torque is expressed in units of ________. - CORRECT ANSWER - pound-feet
Horsepower is expressed in units of ________. - CORRECT ANSWER - foots per pound
A normally aspirated automobile engine loses about ________ power per 1000 feet of altitude. -
CORRECT ANSWER - 3%
One cylinder of an automotive four-stroke cycle engine completes a cycle every ________. - CORRECT
ANSWER - 720 degrees
How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle engine?
- CORRECT ANSWER - one-half
A rotating force is called ________. - CORRECT ANSWER - Torque
Technician A says that the crankshaft determines the stroke of an engine. Technician B says that the
length of the connecting rod determines the stroke of an engine. Which technician is correct? -
CORRECT ANSWER - Tech A crankshaft
Which component is NOT needed in a typical overhead cam engine? - CORRECT ANSWER -
pushrod
, Technician A says that a typical DOHC V6 engine uses two camshafts. Technician B says that overhead
cam engines generally can run at higher rotational speeds than overhead valve engines. Which technician
is correct? - CORRECT ANSWER - Tech B overhead cam engines
Which of the following is the most correct statement about the direction of engine rotation? - CORRECT
ANSWER - Most engines rotate clockwise as viewed from the front of the engine.
The following statements are all correct EXCEPT ________ - CORRECT ANSWER - Torque
always results in movement
Technician A says that changing connecting rod length changes engine stroke. Technician B says that
changing connecting rod length changes the position of the piston in the cylinder. Which technician is
correct? - CORRECT ANSWER - Tech B Changes position on the piston
All of these are correct EXCEPT ________ - CORRECT ANSWER - Engines produce higher
horsepower at higher altitude.
The following statements are all correct EXCEPT ________ - CORRECT ANSWER - Torque
always results in movement.
How many degrees of CRANKSHAFT rotation are needed to complete the four stroke combustion cycle?
- CORRECT ANSWER - 720
How many degrees of CRANKSHAFT rotation are required for a piston to travel from TDC to BDC and
return to TDC? - CORRECT ANSWER - 360
Winter blend gasoline ________. - CORRECT ANSWER - Can cause engine driveability
problems if used during warm weather
Vaporizes more easily than summer blend gasoline
Has a higher RVP
Vapor lock can occur ________. - CORRECT ANSWER - If a fuel line is restricted
As a result of excessive heat near fuel lines
ACTUAL Questions and CORRECT
Answers
All overhead valve engines ________. - CORRECT ANSWER - Have the overhead valves in the
head
An SOHC V8 engine has how many camshafts? - CORRECT ANSWER - Two
Torque is expressed in units of ________. - CORRECT ANSWER - pound-feet
Horsepower is expressed in units of ________. - CORRECT ANSWER - foots per pound
A normally aspirated automobile engine loses about ________ power per 1000 feet of altitude. -
CORRECT ANSWER - 3%
One cylinder of an automotive four-stroke cycle engine completes a cycle every ________. - CORRECT
ANSWER - 720 degrees
How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle engine?
- CORRECT ANSWER - one-half
A rotating force is called ________. - CORRECT ANSWER - Torque
Technician A says that the crankshaft determines the stroke of an engine. Technician B says that the
length of the connecting rod determines the stroke of an engine. Which technician is correct? -
CORRECT ANSWER - Tech A crankshaft
Which component is NOT needed in a typical overhead cam engine? - CORRECT ANSWER -
pushrod
, Technician A says that a typical DOHC V6 engine uses two camshafts. Technician B says that overhead
cam engines generally can run at higher rotational speeds than overhead valve engines. Which technician
is correct? - CORRECT ANSWER - Tech B overhead cam engines
Which of the following is the most correct statement about the direction of engine rotation? - CORRECT
ANSWER - Most engines rotate clockwise as viewed from the front of the engine.
The following statements are all correct EXCEPT ________ - CORRECT ANSWER - Torque
always results in movement
Technician A says that changing connecting rod length changes engine stroke. Technician B says that
changing connecting rod length changes the position of the piston in the cylinder. Which technician is
correct? - CORRECT ANSWER - Tech B Changes position on the piston
All of these are correct EXCEPT ________ - CORRECT ANSWER - Engines produce higher
horsepower at higher altitude.
The following statements are all correct EXCEPT ________ - CORRECT ANSWER - Torque
always results in movement.
How many degrees of CRANKSHAFT rotation are needed to complete the four stroke combustion cycle?
- CORRECT ANSWER - 720
How many degrees of CRANKSHAFT rotation are required for a piston to travel from TDC to BDC and
return to TDC? - CORRECT ANSWER - 360
Winter blend gasoline ________. - CORRECT ANSWER - Can cause engine driveability
problems if used during warm weather
Vaporizes more easily than summer blend gasoline
Has a higher RVP
Vapor lock can occur ________. - CORRECT ANSWER - If a fuel line is restricted
As a result of excessive heat near fuel lines
