Deck 5: Engine Systems

Question 1

What engine part converts the up and down motion of the pistons to rotary motion?

A) Timing gears
B) Crankshaft
C) Connecting rod
D) Camshaft

Answer 1

B

Question 2

Horsepower is expressed in units of ________.

A) foot-pounds
B) foot-pounds per minute
C) pound-feet per second
D) pound-feet

Answer 2

B

Question 3

One cylinder of an automotive four-stroke cycle engine completes a cycle every ________.

A) 360 degree
B) 90 degree
C) 180 degree
D) 720 degree

Answer 3

D

Question 4

How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle engine?

A) One-half
B) Two
C) One-fourth
D) One

Question 5

A rotating force is called ________.

A) eccentric movement
B) combustion pressure
C) torque
D) horsepower

Question 6

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?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 7

A normally aspirated automobile engine loses about ________ power per 1000 feet of altitude.

A) 5%
B) 6%
C) 1%
D) 3%

Question 8

Boost pressure is generally measured in ________.

A) PSI
B) inch H₂O
C) inch pound
D) inch Hg

Question 9

At what speed does the camshaft rotate?

A) On-fourth of the crankshaft speed
B) Half crankshaft speed
C) The same speed as the crankshaft speed
D) Twice crankshaft speed

Question 10

One horsepower is how many watts?

A) 746
B) 10,000
C) 467
D) 1,000

Question 11

How many degrees of CAMSHAFT rotation are needed to complete the four stroke combustion cycle?

A) 360
B) 90
C) 720
D) 180

Question 12

Torque is expressed in units of ________.

A) pound-feet
B) foot-pounds
C) pound-feet per second
D) foot-pounds per minute

Question 13

The diameter of a cylinder is called the ________.

A) stroke
B) diameter
C) bore
D) radius

Question 14

The following statements are all correct EXCEPT ________.

A) torque is often expressed in pound-feet
B) torque always results in movement
C) torque is the measurement of rotational force
D) All of the above answers are correct.

Question 15

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 16

All of these are correct EXCEPT ________.

A) forced induction reduces the effect of altitude on engine power
B) engines produce lower horsepower at higher altitude
C) engines produce higher horsepower at higher altitude
D) air is less dense and contains less oxygen at higher altitude

Question 17

The ________ converts linear motion of the pistons into rotary motion.

A) crankshaft
B) connecting rod
C) camshaft
D) None of these

Question 18

How many degrees of CAMSHAFT rotation are needed for a piston to travel from TDC to BDC and return to TDC?

A) 180
B) 360
C) 720
D) 90

Question 19

How many degrees of CRANKSHAFT rotation are required for a piston to travel from TDC to BDC and return to TDC?

A) 90
B) 180
C) 360
D) 720

Question 20

An engine with a displacement of 302 cubic inches converts to ________ liters (rounded off).

A) 3.7
B) 4.9
C) 5.7
D) 49

Question 21

A 5.7 liter engine is about what size in cubic inches?

A) 426
B) 305
C) 400
D) 350

Question 22

The metric unit for torque used by most original equipment manufacturers (OEM) is which of these?

A) Newton-meter
B) Foot-pound
C) Pound-foot
D) Kilogram-meter

Question 23

The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. This process is called ________.

A) combustion
B) torque
C) power
D) consumption

Question 24

A supercharger increases the amount of ________ that is available to the engine.

A) temperature
B) fuel
C) air
D) oil pressure

Question 25

The turbocharger blades are driven by ________.

A) exhaust gases
B) a large belt
C) intake gases
D) a chain or gear

Question 26

Which part of the four stroke cycle is illustrated in this drawing?

A) Power
B) Compression
C) Intake
D) Exhaust