Deck 3: Basic Theories and Math

Question 1

The starter motor in an automobile converts electrical energy to _____ energy.

A) chemical
B) thermal
C) mechanical
D) radiant

Answer 1

C

Question 2

The process that increases the hardness of the outer surfaces of steel while leaving the core relatively soft is called ______.

A) heat treating
B) carburizing
C) anodizing
D) electrolysis

Answer 2

B

Question 3

Conduction is the transfer of heat by movement of a heated object.

Answer 3

False

Question 4

All matter exists as ______.

A) gas
B) liquid
C) solid
D) all answers are correct

Question 5

Technician A says materials that absorb fluids are impermeable substances. Technician B says that materials that adsorb fluids are permeable substances

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 6

When a piece of wood is burned, its energy is destroyed.

Question 7

When the weight of a wheel and tire assembly is distributed equally around the center of wheel rotation, the wheel and tire have proper dynamic balance.

Question 8

When an object is moving, it is said to be static.

Question 9

Which automotive component converts mechanical energy to electrical energy?

A) starter
B) generator
C) battery
D) none of these answers is correct

Question 10

Friction can be reduced only by lubrication.

Question 11

Oxygen exists as a single atom.

Question 12

Pascal constructed the first known hydraulic device.

Question 13

Forces are being discussed. Technician A says centrifugal force tends to pull things toward the center of a circle. Technician B says centripetal force tends to push things away from the center of a circle. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 14

Iron combines with hydrogen to form rust.

Question 15

Technician A says that frequency of a wave or vibration is the number of cycles per second. Technician B says the amplitude of a wave or vibration is the intensity or strength. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 16

One of the most abundant metals on earth is calcium.

Question 17

Torque is expressed in pounds per foot [lbs./ft.].

Question 18

All materials have a unique resonant or natural vibration frequency.

Question 19

Curb weight is the total weight of the vehicle including the driver, passengers, and cargo.

Question 20

A force acting over a large area will exert less pressure per square inch than the same force acting over a smaller area.

Question 21

The strength of an electrostatic force is called ______.

A) current
B) voltage
C) watts
D) amperage

Question 22

Technician A says both liquids and gases are fluids. Technician B says liquids can be compressed. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 23

_____ is a force that does work and tends to turn things.

A) Inertia
B) Momentum
C) Torque
D) All answers are correct

Question 24

When two or more forces are applied to an object, the combined force is called the ______.

A) centripetal force
B) resultant
C) gravity
D) intensity

Question 25

Which of the following objects contain heat?

A) ice
B) refrigerant
C) fire
D) all answers are correct

Question 26

Which of the following laws pertains to the behavior of gases?

A) Pascal's law
B) Newton's law
C) Hertz's law
D) Boyle's law

Question 27

How many times a vibration occurs in one second is called _____.

A) frequency
B) hertz
C) both "frequency" and "hertz"
D) neither "frequency" nor "hertz"

Question 28

Forces can be _____.

A) turning
B) balanced
C) unbalanced
D) all answers are correct

Question 29

A galvanized part is made of iron or steel that has been coated with _____.

A) tin
B) zinc
C) chromium
D) nickel

Question 30

Motion is being discussed. Technician A says the inertia of an object at rest is called static inertia. Technician B says dynamic inertia refers to an object in motion. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 31

The coefficient of drag (Cd) is _____.

A) the total resistance to motion caused by air friction
B) the rate of acceleration divided by time
C) the distance a vehicle travels divided by time
D) the amount of horsepower an engine produces divided by the friction of the driveline

Question 32

The _____ of an engine expresses how much the air and fuel mixture will be compressed as the cylinder moves from BDC to TDC.

A) volumetric efficiency
B) compression pressure
C) compression ratio
D) none of these answers is correct

Question 33

Technician A says Newton's first law of motion is the law of inertia. Technician B says Newton's second law says for every action, there is an equal and opposite reaction. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 34

The most common unit of vacuum is _____.

A) pounds per square inch-negative
B) millibar
C) newtons/square meter
D) inches of mercury

Question 35

Heat measurement is being discussed. Technician A says a BTU is the amount of heat it takes to raise the temperature of one gram of water one degree Fahrenheit. Technician B say a calorie is the amount of heat it takes to raise one pound of water one degree Celsius. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 36

If the tooth on the driving gear is pushing against the tooth of a driven gear with a force of 15 pounds and the radius of the driving gear is 1 foot, how much force will be applied to the driven gear?

A) 1 ft.-lb.(1.35 N·m)
B) 30 ft.-lb.(40.67 N·m)
C) 15 ft.-lb.(20.33 N·m)
D) none of these answers is correct

Question 37

All the following are types of heat transfer EXCEPT:

A) convection
B) radiation
C) conduction
D) inversion

Question 38

All the following are properties of metals EXCEPT:

A) good electrical and heat conductivity
B) low light reflectivity
C) malleability
D) ductility

Question 39

Sound is being discussed. Technician A says a decibel is a measurement of the intensity of a sound. Technician B says the pitch of a sound is based on its frequency. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 40

You have a sealed hydraulic system with two cylinders connected to each other by a tube filled with hydraulic fluid. Piston #1 has an area of 1 sq. in. Piston #2 has an area of 4 sq. in. How much force is developed on piston #2 if 50 lbs. of force is applied to piston #1?

A) 12.5 lbs.
B) 50 lbs.
C) 200 lbs.
D) 500 lbs.

Question 41

The strength of an electromagnet is dependent on _____.

A) the number of coil windings [length of the conductor]
B) the amount of current [amps] passing through the coil
C) both "the number of coil windings [length of the conductor]" and "the amount of current [amps] passing through the coil"
D) neither both "the number of coil windings [length of the conductor]" nor "the amount of current [amps] passing through the coil"

Question 42

If the driving gear has 11 teeth and the driven gear has 44 teeth, the gear ratio equals ____________________ to 1.

Question 43

Technician A says kinetic energy in the crankshaft is converted into electrical energy by the generator. Technician B says electrical energy in the generator is converted into chemical energy in the battery. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 44

The change in atmospheric pressure is measured with a ____________________.

Question 45

The amount of engine coolant that should be mixed with water is a called a ____________________.

Question 46

The formula CID = π x R² x L x N is used to calculate _____.

A) compression ratio
B) volumetric efficiency
C) horsepower
D) engine displacement

Question 47

When applied forces are balanced, the object is said to be in ____________________.

Question 48

Ten kilograms of gasoline weighs approximately ____________________ pounds.

Question 49

The volume of an engine's cylinders determines its size, which is expressed as ____________________.

Question 50

_____________ is the tendency of an object at rest to remain at rest or the tendency of an object in motion to remain in motion.

Question 51

The unit of frequency is ____________________.

Question 52

Engine power is measured in _____.

A) horsepower
B) watts
C) both "horsepower" and "watts"
D) neither "horsepower" nor "watts"

Question 53

When ice is warmed to 32°F, the heat needed to convert the ice into water that does not raise the temperature of the water is called _____ heat.

A) latent
B) polymorphous
C) thermoscopic
D) ambient

Question 54

____________________ is the rate at which torque is produced.

Question 55

____________________ is the study of the effects of air on a moving object.

Question 56

____________________ balance exists when the weight thrown to the sides of a tire is equal when the assembly is rotating.

Question 57

When fuel burns in the engine cylinders, ____________________ energy is converted to ____________________ energy.

Question 58

Engine efficiency is expressed as a ____________________.

Question 59

The fixed pivot point that a lever rotates on is called the ____________________.

Question 60

____________________ is the rate of increase in speed.

Question 61

What is horsepower?

Question 62

How is an electromagnet constructed?

Question 63

What is an alloy?

Question 64

Name five simple machines.

Question 65

A brake drum is stamped Maximum Diameter 203.5mm. What is the maximum diameter in inches (to three decimal places) that the drum can be used?

Question 66

What is specific gravity?

Question 67

Calculate the compression ratio of an engine that has a cylinder volume of 450cc and a chamber volume of 52cc.

Question 68

What is a mechanical advantage?

Question 69

Calculate the displacement in liters of a four cylinder engine that has a bore of 88mm and a stroke of 94mm.

Question 70

What is a decibel?

Question 71

What is the thermal efficiency of a vehicle that produces 34,000 BTU of work for each 100,000 BTU of fuel it uses?

Question 72

What is a vacuum?

Question 73

What is the pH scale?

Question 74

What is tensile strength?

Question 75

Engine torque can be multiplied by ____________________.

Question 76

How much horsepower is generated by an engine running at 5800 rpm while producing 265 lbs./ft. of torque.