Mechanics

Question 1

A worker in a shop lifts his protective eyewear to inspect his work. A metal fragment from a nearby work station flies onto his eye causing injury. What is the chance that the fragment would strike his eye?

Answer 1

Accident

Question 2

What is a common example of an accident associated with power, structural, and technical systems?

Answer 2

Falling objects

Question 3

In an agricultural shop, which is the appropriate color to use for informational signs such as “out of order” or “do not operate?”

Answer 3

yellow

Question 4

What is the highest priority regarding work done in agricultural power, structural, and technical systems?

Answer 4

safety

Question 5

what is an example of a hazard?

Answer 5

spill

Question 6

which is the first step to take in the event of a spill in an agricultural shop?

Answer 6

tell teacher

Question 7

why is it important for business owners to promote safety in the workplace?

Answer 7

safety regulations

Question 8

what is the primary system of internal combustion engines commonly known as?

Answer 8

compression system

Question 9

why must internal combustion engines have a method for achieving ignition in their cylinders?

Answer 9

to start the combustion

Question 10

what are the components of the operating system?

Answer 10

air intake, fuel, exhaust, lubrication, and starting systems

Question 11

list the accessory systems of an engine.

Answer 11

power steering, air intake system, and cooling system

Question 12

what is the overall goal in the compression system?

Answer 12

effectively compress air to increase potential energy resulting from combustion of the fuel

Question 13

what is the downward movement of the piston?

Answer 13

intake stroke

Question 14

why should piston rings keep a secure and solid fitting on the top of the piston?

Answer 14

no air could leave or fluids

Question 15

what is a device that closes the valve and holds it open at the appropriate times?

Answer 15

spring retevers

Question 16

what devices opens and closes the valves in an engine?

Answer 16

valve springs

Question 17

what is a component of both the air intake system and fuel system?

Answer 17

Carburetor

Question 18

what system plays a major role in heat transfer?

Answer 18

cooling system

Question 19

_____ is part of the liquid cooling system that functions by transferring heat and is a cooling and storage area for the liquid combination of water and antifreeze

Answer 19

radiator

Question 20

what is the most common problem when working with engines?

Answer 20

lack of knowledge

Question 21

what should be used to protect against falling objects?

Answer 21

hard hat

Question 22

the piston operates inside a ____

Answer 22

cylinder block

Question 23

what is a device that allows the fuel mixture to enter?

Answer 23

intake valves

Question 24

what is a function of engine oil?

Answer 24

reduce wear on moving parts lubrication

Question 25

what is the first step in disassembling an engine?

Answer 25

drain all the fluids

Question 26

during reassemble of an engine, what should be installed in the crankcase?

Answer 26

shaft to keep crankshaft from moving

Question 27

if a machine is going to be stored for a long period of time then which of the following practices should be performed?

Answer 27

winterized

Question 28

what is the biggest difference between hand tools and power tools

Answer 28

power tools use electricity

Question 29

which tool would be the best selection for the prose of cutoff work, including squaring boards, cutting them to length, and cutting them at angles of bevels?

Answer 29

saw

Question 30

what is a tool that uses a motor to turn either a metal blade with teeth or an abrasive disk to cut through materials?

Answer 30

circular saw

Question 31

which plumbing system brings fresh water into a structure from a city water main or private well?

Answer 31

fresh, main water line

Question 32

why should plumbing fixtures be near each other?

Answer 32

increase efficiency and reduce cost

Question 33

faucets, toilets, showers, washing machines, and water heaters can be classified a _____.

Answer 33

fixtures

Question 34

what should be consulted before any plumbing work is performed?

Answer 34

local plumbing codes

Question 35

what devices is designed to stop water flow if needed?

Answer 35

shutoff vavlve

Question 36

if a home owner needed to measure how much water is being used, then what device would be used?

Answer 36

water meter

Question 37

where is the hot water supply line routed before it arrives to fixtures?

Answer 37

on the left

Question 38

how can pressure loss occur within water supply lines?

Answer 38

A leak, size of piping, height of buildings, length of piping

Question 39

if a home is using a private well for its water source then what maintains the pressure within the system?

Answer 39

water pump

Question 40

hot water lines should be placed on the ____, and cold water lines should be placed on the ____ when diagramming and installing supply lines

Answer 40

left, right

Question 41

what is a loud noise in a supply line caused by a volume of water that suddenly stops moving?

Answer 41

water hammer

Question 42

what can be added to a supply line to provide a cushion of air to absorb the water hammer effect?

Answer 42

air chamber

Question 43

what is the curved section of a pipe near each fixture that holds water to prevent sewage gases from entering the structure?

Answer 43

traps

Question 44

What is something worn to minimize risks on the job?

Answer 44

PPE (personal protective equipment)

Question 45

when lifting heavy object what should a person do?

Answer 45

lift with their legs

Question 46

what is the most common plumbing problems?

Answer 46

dripping faucets, leaking pipes, and running toilets

Question 47

what is the smallest units of an element?

Answer 47

atoms

Question 48

as electrons move around the nucleus, how can this area be described?

Answer 48

rings/shells- valence rings

Question 49

what is the flow of electrons from atom to atom in a conductor?

Answer 49

electricity

Question 50

where does the flow of electrons take place?

Answer 50

outer valence ring

Question 51

what do copper, aluminum, silver, and gold have in common?

Answer 51

good conducters

Question 52

what is a good semiconductor

Answer 52

silicone

Question 53

what theories is the accepted model of electrical current flow?

Answer 53

electron theory

Question 54

one cycle of electricity per second is referred to as ____.

Answer 54

hertz

Question 55

____ are materials that contain electrons that do not share or move freely.

Answer 55

insulators

Question 56

what are elementary particles with no electrical charge?

Answer 56

neutrons

Question 57

___ is the pressure in a circuit that causes the electrons to flow through a conductor.

Answer 57

voltage

Question 58

what is the amount of electrical current flowing past a point in a circuit?

Answer 58

amperage

Question 59

which of the following is an instrument used to measure amperage in a circuit?

Answer 59

ammeter

Question 60

what is a property of any material that opposes the flow of electricity?

Answer 60

resistance

Question 61

what has a low resistance?

Answer 61

conductors

Question 62

there are 20 amps of current low in a circuit with a total resistance of 8 ohms then what would be the voltage source?

Answer 62

160 volts

Question 63

what is the movement of a force through a distance?

Answer 63

work

Question 64

how much does one kilowatt equal?

Answer 64

1,000 watts

Question 65

how is electricity sold?

Answer 65

Kilowatt - hour

Question 66

if .96 amps of current flows through a 120-volt circuit, how many watts of electrical power are being used?

Answer 66

115.2 watts

Question 67

why is copper preferred over aluminum when wiring most branch circuits?

Answer 67

better conducter

Question 68

what is used to regulate heating and cooling systems?

Answer 68

thermostats

Question 69

which of the following are devices used when a convenience outlet is in the same device box with a switch?

Answer 69

breaker box

Question 70

what is used to trace circuits and to test fuses and lines?

Answer 70

circuit breaker

Question 71

a ____ is one wire connected to another wire

Answer 71

spliced

Question 72

if cutting wire, sptripping conductors and attaching to terminals are required then what tool should be used?

Answer 72

wire strippers

Question 73

how does the electrode holder protect the welder?

Answer 73

so we don't make electrical contact

Question 74

what causes the electric energy to be transformed into heat?

Answer 74

kinetic energy

Question 75

if electrons flow in one direction then what is this situation referred to as?

Answer 75

DC or Direct Current

Question 76

when the electrons flow from the electrode to the workpiece, it is____.

Answer 76

Arc welding

Question 77

what do the first two digits of a four-digit number on an electrode indicate?

Answer 77

tensile strength