Question 1

What engine part converts the up and down motion of the pistons to rotary motion?&#10;A) Timing gears&#10;B) Crankshaft&#10;C) Connecting rod&#10;D) Camshaft

Accepted Answer

The part that converts the up and down motion of the pistons to rotary motion is the crankshaft. It uses the connecting rods connected to the pistons to convert linear motion to a rotational motion.

Question 2

Horsepower is expressed in units of ________.&#10;A) foot-pounds&#10;B) foot-pounds per minute&#10;C) pound-feet per second&#10;D) pound-feet

Accepted Answer

Horsepower is a unit of power, defined as the amount of work done in a unit of time. It is equivalent to 550 foot-pounds per second or 33,000 foot-pounds per minute. Therefore, option B, foot-pounds per minute, is the correct unit for expressing horsepower.

Question 3

One cylinder of an automotive four-stroke cycle engine completes a cycle every ________.&#10;A) 360 degree&#10;B) 90 degree&#10;C) 180 degree&#10;D) 720 degree

Accepted Answer

One complete cycle in a four-stroke cycle engine involves four different strokes - intake, compression, power, and exhaust. Each stroke occupies 180 degrees of the engine's rotation, resulting in a total of 720 degrees for a complete cycle.

Question 4

How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle engine?&#10;A) One-half&#10;B) Two&#10;C) One-fourth&#10;D) One

Accepted Answer

In a four-stroke cycle engine, each stroke (intake, compression, power, exhaust) requires one-half rotation of the crankshaft to complete, totaling two rotations for the entire four-stroke cycle.

Question 5

A rotating force is called ________.&#10;A) eccentric movement&#10;B) combustion pressure&#10;C) torque&#10;D) horsepower

Accepted Answer

A rotating force is commonly known as torque.

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?&#10;A) Technician A only&#10;B) Technician B only&#10;C) Both Technicians A and B&#10;D) Neither Technician A nor B

Accepted Answer

The stroke of an engine is determined by the crankshaft, specifically by the distance the crankshaft moves the piston up and down within the cylinder. The length of the connecting rod does not determine the stroke; it connects the piston to the crankshaft and can affect the engine's geometry and dynamics, but not the stroke length directly.

Question 7

A normally aspirated automobile engine loses about ________ power per 1000 feet of altitude.&#10;A) 5%&#10;B) 6%&#10;C) 1%&#10;D) 3%

Accepted Answer

A normally aspirated automobile engine loses about 3% power per 1000 feet of altitude.

Question 8

Boost pressure is generally measured in ________. A) PSI B) inch H₂O C) inch pound D) inch Hg

Accepted Answer

Boost pressure is typically measured in PSI (pounds per square inch).

Question 9

At what speed does the camshaft rotate?&#10;A) On-fourth of the crankshaft speed&#10;B) Half crankshaft speed&#10;C) The same speed as the crankshaft speed&#10;D) Twice crankshaft speed

Accepted Answer

The camshaft rotates at half the speed of the crankshaft. This is because the camshaft is driven by the crankshaft through a timing belt or chain with a different diameter, which results in the slower rotation speed. This slower speed allows the camshaft to open and close the engine's valves at the right times for combustion.

Question 10

One horsepower is how many watts?&#10;A) 746&#10;B) 10,000&#10;C) 467&#10;D) 1,000

Accepted Answer

One horsepower is equal to 746 watts.

Question 11

How many degrees of CAMSHAFT rotation are needed to complete the four stroke combustion cycle?&#10;A) 360&#10;B) 90&#10;C) 720&#10;D) 180

Accepted Answer

The answer of How many degrees of CAMSHAFT rotation are...

Question 12

Torque is expressed in units of ________.&#10;A) pound-feet&#10;B) foot-pounds&#10;C) pound-feet per second&#10;D) foot-pounds per minute

Accepted Answer

The answer of Torque is expressed in units of ________.&#10;A)...

Question 13

The diameter of a cylinder is called the ________.&#10;A) stroke&#10;B) diameter&#10;C) bore&#10;D) radius

Accepted Answer

The answer of The diameter of a cylinder is called...

Question 14

The following statements are all correct EXCEPT ________.&#10;A) torque is often expressed in pound-feet&#10;B) torque always results in movement&#10;C) torque is the measurement of rotational force&#10;D) All of the above answers are correct.

Accepted Answer

The answer of The following statements are all correct EXCEPT...

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

Accepted Answer

The answer of Technician A says that changing connecting rod...

Question 16

All of these are correct EXCEPT ________.&#10;A) forced induction reduces the effect of altitude on engine power&#10;B) engines produce lower horsepower at higher altitude&#10;C) engines produce higher horsepower at higher altitude&#10;D) air is less dense and contains less oxygen at higher altitude

Accepted Answer

The answer of All of these are correct EXCEPT ________.&#10;A)...

Question 17

The ________ converts linear motion of the pistons into rotary motion.&#10;A) crankshaft&#10;B) connecting rod&#10;C) camshaft&#10;D) None of these

Accepted Answer

The answer of The ________ converts linear motion of the...

Question 18

How many degrees of CAMSHAFT rotation are needed for a piston to travel from TDC to BDC and return to TDC?&#10;A) 180&#10;B) 360&#10;C) 720&#10;D) 90

Accepted Answer

The answer of How many degrees of CAMSHAFT rotation are...

Question 19

How many degrees of CRANKSHAFT rotation are required for a piston to travel from TDC to BDC and return to TDC?&#10;A) 90&#10;B) 180&#10;C) 360&#10;D) 720

Accepted Answer

The answer of How many degrees of CRANKSHAFT rotation are...

Question 20

An engine with a displacement of 302 cubic inches converts to ________ liters (rounded off).&#10;A) 3.7&#10;B) 4.9&#10;C) 5.7&#10;D) 49

Accepted Answer

The answer of An engine with a displacement of 302...

Question 21

A 5.7 liter engine is about what size in cubic inches?&#10;A) 426&#10;B) 305&#10;C) 400&#10;D) 350

Accepted Answer

The answer of A 5.7 liter engine is about what...

Question 22

The metric unit for torque used by most original equipment manufacturers (OEM) is which of these?&#10;A) Newton-meter&#10;B) Foot-pound&#10;C) Pound-foot&#10;D) Kilogram-meter

Accepted Answer

The answer of The metric unit for torque used by...

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 ________.&#10;A) combustion&#10;B) torque&#10;C) power&#10;D) consumption

Accepted Answer

The answer of The chemical energy in fuel is converted...

Question 24

A supercharger increases the amount of ________ that is available to the engine.&#10;A) temperature&#10;B) fuel&#10;C) air&#10;D) oil pressure

Accepted Answer

The answer of A supercharger increases the amount of ________...

Question 25

The turbocharger blades are driven by ________.&#10;A) exhaust gases&#10;B) a large belt&#10;C) intake gases&#10;D) a chain or gear

Accepted Answer

The answer of The turbocharger blades are driven by ________.&#10;A)...

Question 26

Which part of the four stroke cycle is illustrated in this drawing?  &#10;A) Power&#10;B) Compression&#10;C) Intake&#10;D) Exhaust

Accepted Answer

The answer of Which part of the four stroke cycle...

Deck 5: Engine Systems