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Exams (fall 2016) > Mechanics > Flashcards

Mechanics Flashcards

1
Q

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?

A

Accident

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2
Q

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

A

Falling objects

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3
Q

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

A

yellow

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4
Q

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

A

safety

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5
Q

what is an example of a hazard?

A

spill

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6
Q

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

A

tell teacher

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7
Q

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

A

safety regulations

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8
Q

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

A

compression system

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9
Q

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

A

to start the combustion

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10
Q

what are the components of the operating system?

A

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

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11
Q

list the accessory systems of an engine.

A

power steering, air intake system, and cooling system

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12
Q

what is the overall goal in the compression system?

A

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

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13
Q

what is the downward movement of the piston?

A

intake stroke

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14
Q

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

A

no air could leave or fluids

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15
Q

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

A

spring retevers

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16
Q

what devices opens and closes the valves in an engine?

A

valve springs

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17
Q

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

A

Carburetor

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18
Q

what system plays a major role in heat transfer?

A

cooling system

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19
Q

_____ 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

A

radiator

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20
Q

what is the most common problem when working with engines?

A

lack of knowledge

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21
Q

what should be used to protect against falling objects?

A

hard hat

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22
Q

the piston operates inside a ____

A

cylinder block

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23
Q

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

A

intake valves

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24
Q

what is a function of engine oil?

A

reduce wear on moving parts lubrication

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25
Q

what is the first step in disassembling an engine?

A

drain all the fluids

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26
Q

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

A

shaft to keep crankshaft from moving

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27
Q

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

A

winterized

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28
Q

what is the biggest difference between hand tools and power tools

A

power tools use electricity

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29
Q

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?

A

saw

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30
Q

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

A

circular saw

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31
Q

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

A

fresh, main water line

32
Q

why should plumbing fixtures be near each other?

A

increase efficiency and reduce cost

33
Q

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

A

fixtures

34
Q

what should be consulted before any plumbing work is performed?

A

local plumbing codes

35
Q

what devices is designed to stop water flow if needed?

A

shutoff vavlve

36
Q

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

A

water meter

37
Q

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

A

on the left

38
Q

how can pressure loss occur within water supply lines?

A

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

39
Q

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

A

water pump

40
Q

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

A

left, right

41
Q

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

A

water hammer

42
Q

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

A

air chamber

43
Q

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

A

traps

44
Q

What is something worn to minimize risks on the job?

A

PPE (personal protective equipment)

45
Q

when lifting heavy object what should a person do?

A

lift with their legs

46
Q

what is the most common plumbing problems?

A

dripping faucets, leaking pipes, and running toilets

47
Q

what is the smallest units of an element?

A

atoms

48
Q

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

A

rings/shells- valence rings

49
Q

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

A

electricity

50
Q

where does the flow of electrons take place?

A

outer valence ring

51
Q

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

A

good conducters

52
Q

what is a good semiconductor

A

silicone

53
Q

what theories is the accepted model of electrical current flow?

A

electron theory

54
Q

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

A

hertz

55
Q

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

A

insulators

56
Q

what are elementary particles with no electrical charge?

A

neutrons

57
Q

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

A

voltage

58
Q

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

A

amperage

59
Q

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

A

ammeter

60
Q

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

A

resistance

61
Q

what has a low resistance?

A

conductors

62
Q

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

A

160 volts

63
Q

what is the movement of a force through a distance?

A

work

64
Q

how much does one kilowatt equal?

A

1,000 watts

65
Q

how is electricity sold?

A

Kilowatt - hour

66
Q

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

A

115.2 watts

67
Q

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

A

better conducter

68
Q

what is used to regulate heating and cooling systems?

A

thermostats

69
Q

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

A

breaker box

70
Q

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

A

circuit breaker

71
Q

a ____ is one wire connected to another wire

A

spliced

72
Q

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

A

wire strippers

73
Q

how does the electrode holder protect the welder?

A

so we don’t make electrical contact

74
Q

what causes the electric energy to be transformed into heat?

A

kinetic energy

75
Q

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

A

DC or Direct Current

76
Q

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

A

Arc welding

77
Q

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

A

tensile strength

Exams (fall 2016) (6 decks)

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