Deck 3: Basic Theories and Math

Question 1

Iron combines with hydrogen to form rust.

Answer 1

False

Question 2

Friction can be reduced only by lubrication.

Answer 2

False

Question 3

When an object is moving, it is static.

Answer 3

False

Question 4

Which automotive component converts mechanical energy to electrical energy?

A)starter
B)generator
C)battery
D)None of the answers is correct.

Question 5

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

Question 6

Torque is expressed in pounds per foot (lbs.-ft).

Question 7

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 8

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

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

Question 9

All materials have a unique resonant or natural vibration frequency.

Question 10

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

Question 11

Oxygen exists as a single atom.

Question 12

One of the most abundant metals on earth is calcium.

Question 13

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 14

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

Question 15

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

Question 16

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

Question 17

Matter can exist as a ______.

A)gas
B)liquid
C)solid
D)All the answers are correct.

Question 18

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 19

Blaise  Pascal constructed the first known hydraulic device.

Question 20

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

Question 21

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 A and B
D)neither A nor B

Question 22

All the following are properties of metals EXCEPT:

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

Question 23

Technician A says Newton's first law of motion is the law of inertia. Technician B says Newton's second law of motion says that 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 24

How many times a vibration occurs in one second is referred to as _____.

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

Question 25

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 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

Forces can be _____.

A)turning
B)balanced
C)unbalanced
D)All the answers are correct.

Question 28

The strength of an electrostatic force is called ______.

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

Question 29

All the following are types of heat transfer EXCEPT:

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

Question 30

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 the answers is correct.

Question 31

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 32

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 33

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

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

Question 34

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 35

Which of the following objects contain heat?

A)ice
B)refrigerant
C)fire
D)All the answers are correct.

Question 36

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 the temperature of 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 37

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 38

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 39

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

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

Question 40

The most common unit of vacuum is _____.

A)pounds per square inch
B)millibars
C)newtons/per square meter
D)inches of mercury

Question 41

The change in atmospheric pressure is measured with a ____________________.

Question 42

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

Question 43

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

Question 44

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

Question 45

When ice is warmed to 32°F, the heat needed to convert the ice into water without raising the temperature of the water is called _____ heat.

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

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

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

Question 48

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

Question 49

____________________ is the rate at which torque is produced.

Question 50

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

Question 51

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

Question 52

Engine efficiency is expressed as a ____________________.

Question 53

Ten kilograms of gasoline weighs approximately ____________________ pounds.

Question 54

Engine power is measured in _____.

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

Question 55

The unit of frequency is ____________________.

Question 56

Engine torque can be multiplied by ____________________.

Question 57

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 58

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

Question 59

____________________ is the rate of increase in speed.

Question 60

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

Question 61

What is the pH scale?

Question 62

What is a mechanical advantage?

Question 63

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 64

What is tensile strength?

Question 65

Name five simple machines.

Question 66

How is an electromagnet constructed?

Question 67

What is a decibel?

Question 68

What is an alloy?

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

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

Question 71

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 72

What is horsepower?

Question 73

What is specific gravity?

Question 74

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

Question 75

What is a vacuum?