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Welding Theory Test One > Test One > Flashcards

Test One Flashcards

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1
Q

True or false

Employers are responsible for safety training at the job site and for ensuring that their employees are familiar with it and follow OH and CCOHS regulations

A

True

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2
Q

True or False

When arc welding, make sure there are no cable splices within 10 feet of work

A

True

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3
Q

True or False

All accidents should be reported and documented regardless of how minor they may be

A

True

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4
Q

True or False

Any focus away from the job may result in an accident, causing injury to the welder and or damage to property and equipment

A

True

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5
Q

True or False

Attempting to operate a piece of equipment without instruction, may not only damage the equipment, but it could also result in serious injury

A

True

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6
Q

True or False

Malfunctioning welding equipment should be repaired by the welder as quickly as possible

A

False

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7
Q

True or False

Some welding processes do not require a well ventilated area

A

False

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8
Q

True or False

When welding is completed, the welding machine should be turned off 

A

True

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9
Q

True or False

Faulty insulation, improper grounding, and incorrect operation and maintenance of electrical equipment are typical sources of danger from electric shock

A

True

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10
Q

True or False

First-degree burns are burns that penetrate all three layers of skin and cause permanent tissue damage

A

False

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11
Q

True or False

The oxygen cylinder valve is open with a wrench

A

False

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12
Q

True or False

The operating pressure for acetylene should never exceed 15 psi

A

True

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13
Q

True or False

Acetylene has no detectible odour

A

False

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14
Q

True or False

A cylinder cart should be used to move gas cylinders

A

True

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15
Q

True or False

Two types of oxyacetylene welded torches are injector and the medium pressure

A

True

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16
Q

True or False

Welding tip size is governed by the diameter of it opening

A

True

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17
Q

True or False

Left hand threads are on all fittings for acetylene gas

A

True

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18
Q

True or False

Oxygen cylinders are packed with porous material to store oxygen safely

A

False

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19
Q

True or False

Cylinder should be kept in a vertical position

A

True

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20
Q

True or False

A pair of pliers should be used to install the tip of a welding torch

A

False

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21
Q

True or False

A spark lighter should be used to light the oxyacetylene torch

A

True

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22
Q

True or False

MAPP gas is more sensitive to shock than acetylene

A

False

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23
Q

True or False

Needle valves on the torch, regulate the flow of oxygen and acetylene at the torch

A

True

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24
Q

True or False

Two types of regulators are the single stage and two-stage

A

True

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25
Q

True or False

Welding hoses can be safely repaired with tape

A

False

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26
Q

True or False

Regulator should be handled extremely carefully when being removed from the cylinder

A

True

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27
Q

True or False

Right handed threads are always used to connect for acetylene hoses

A

False

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28
Q

True or False

Oxygen and acetylene cylinders should be chained at all times during use, and when stored

A

True

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29
Q

True or False

Cylinder should not be exposed to any open fire heat or sparks from the torch

A

True

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30
Q

True or False

A match should not be used to ignite the oxyacetylene flame

A

True

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31
Q

True or False

Acetylene cylinders are packed with the porous material that is saturated with acetone to allow the safe storage of acetylene

A

True

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32
Q

True or False

And acetylene regulator has a red line at 15 psi, indicating a dangerous operating range

A

True

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33
Q

True or False

The atmosphere is comprised of approximately 30% oxygen

A

False

21%

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34
Q

Acetylene gas_______________

A.) Has a very distinct nauseating odour

B.) must be used in a mixture with maple

C.) gas is yellow in colour

D.) is formed by a mixture of carbon and nitrogen

A

A.) Has a very distinct nauseating odour

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35
Q

A_____ is caused by the flame going out suddenly on the torch

A.)Flashback
B.)firewall
C.)creeping, regulator
D.)backfire

A

D.) Back fire

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36
Q

The skills required for are often compared with those developed practicing oxyacetylene welding

A.) SAW
B.) GMAW
C.) GTAW
D.) SMAW

A

C.) GTAW

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37
Q

The combination of oxygen and_____ generates a low temperature, flame used, primarily for welding, thin sections of metal, usually a living room, which low temperatures are required

A.) Propane
B.) Methyelacetylene propadiene
C.) Nitrogen
D.) Hydrogen

A

B.) Methyelacetylene propadiene

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38
Q

A______ allows the flow of liquid or gas in One Direction only

A.) Flash arrestor
B.) Check valve
C.) Needle Valve
D.) Tip

A

B.) Check Valve

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39
Q

True or False

Applying soapy water to an oxyacetylene outfit with a brush can be used to locate leaks

A

True

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40
Q

True or False

The cylinder valve is cracked to remove. Foreign mattered lodged in the outer nozzle

A

True

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41
Q

True or False

Open the cylinder valves to purge the welding hoses

A

False

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42
Q

True or False

The size of the welding tip depends on the amount of pressure used

A

False

43
Q

True or False

The welder should stand to one side of the regular, and opening the cylinder valves

A

True

44
Q

True or False

The acetylene needle valve should be open fully to ensure quick lighting of the torch

A

False

45
Q

True or False

A torch should be lit with a tip pointing downward

A

True

46
Q

True or False

No pressure should be left in the working pressure gauges when the welding unit is shut down

A

True

47
Q

True or False

An oxidizing flame has a slight feather, extending from the inner cone of the flame

A

False

48
Q

True or False

A neutral flame is used for most welding operations

A

True

49
Q

True or False

Popping is caused by insufficient gas flow to the welding torch

A

True

50
Q

True or False

A neutral flame results from one to one mixture of oxygen and acetylene

A

True

51
Q

An oxidizing flame resembles the neutral flame slightly, but has an inner cone that is shorter and more pointed with an almost______ colour that rather than brilliant white

A.) Yellow
B.) Orange
C.) Green
D.) Purple

A

D.) Purple

52
Q

A _____ flame is sometimes used for brazing

A.) Reducing
B.) Neutral
C.) Caburizing
D.) Oxidizing

A

D.) Oxidizing

53
Q

A _____flame has the tendency to depress the molten surface and cause the metal to splatter around the edges of the weld pool

A.) Quiet
B.) Backfiring
C.) Flashback
D.) Harsh

A

D.) Harsh

54
Q

A ____ where is the last step to take when shutting off the entire welding unit after all welding is complete

A.) shutting off both acetylene and oxygen cylinder valves
B.) removing pressure on the working gauges by opening the needle valves until the line is drained, then promptly closing the needle valves.
C.) releasing the ejector screws on the pressure regulators.
D.) cracking the cylinder valves by opening and closing them quickly to remove foreign matter

A

C.) release the injector screws on the pressure regulator.

55
Q

True or False

Braze welding, should be performed on flat position

A

True

56
Q

True or False

When brazing, the lowest effective brazing temperatures possible, should be used to minimize the effects of heat on the base metal

A

True

57
Q

True or False

Uniform capillary action is only possible when surfaces are completely free a foreign substances such as dirt oil, grease and oxide

A

True

58
Q

True or False

Filler metals suitable for brazing are those that begin to melt or changed to a liquid state at temperatures above 370°F

A

False

59
Q

True or False

Some filler metals for brazing are manufactured with a flux coating

A

True

60
Q

True or False

The flex residue should be removed from the base metal after brazing

A

True

61
Q

True or False

When brazing, the base metal is melted to form in good joint

A

True

62
Q

True or False

Brazing can be used to join dissimilar metals

A

True

63
Q

True or False

Production brazing often uses a furnace as a heat source

A

True

64
Q

True or False

A butt joint provides the same strength as a lap joint

A

False

65
Q

True or False

A brazing filler metal must be molten before it flows into the joint

A

True

66
Q

True or False

If a base metal is not hot enough when brazing, the filler metal will begin to roll off of the base metal as water does on a greasy surface

A

True

67
Q

True or False

Brazing is done at temperatures above 840°F and below the melting temperature of the metals joined

A

True

68
Q

True or False

Breeze, welding, filler metals are usually brasses with an approximate composition of 60% copper and 40% zinc

A

True

69
Q

True or False

When breeze welding, preheat the base metal, and until it turns a bright red colour

A

False

70
Q

True or False

Braze welding uses capillary action to bond the weld pieces together

A

False

71
Q

True or False

The welding torch is rotated in a circular motion when breeze welding

A

True

72
Q

True or False

Soldering requires less heat than brazing

A

True

73
Q

True or False

The point of the soldering copper should be coded with a thin layer of solder to form a proper joint

A

True

74
Q

Brazing is performed at an approximate temperature that is greater than ____ degrees Fahrenheit, in less than the melting point of the base metal

A

840

75
Q

In the_____ brazing process, heat is generated in the same manner as spot welding

A

Resistance

76
Q

Soldering containing 50% lead and 50% tin metals at ____ degrees Fahrenheit

A

471

77
Q

_____ soldering is a process in which two services are soldered together without any solder being visible

A

Sweat

78
Q

_____ is used to clean a soldering copper

A

Sal ammoniac

79
Q

A _____ is a material used to outline areas that should not be braised

A

Stop off

80
Q

True or False

Hot Ark provides an extra boost of current to help establish an earth when using electrodes that are hard to start 

A

True

81
Q

True or False

A constant current welding machine is used for shielded metal ark welding

A

True

82
Q

True or False

The heat generated when using shield metal arc welding ranges from 6000°F to 10,000°F

A

True

83
Q

True or False

Current is the amount of flow through an electrical circuit

A

True

84
Q

True or False

The actual voltage used to provide the welding. Current ranges from 200v 440v

A

False

85
Q

True or False

SMAW cannot weld carbon, steel, lower, high quality, alloy, steel, stainless steel, cast iron, or ductile iron

A

False

86
Q

True or False

In North America alternating current is rated at 50 Hz

A

False

87
Q

True or False

Resistance is a force that causes current to move in a circuit

A

False

88
Q

True or False

Direct current is electrical current that flows in One Direction only

A

True

89
Q

True or False

A transformer, changes AC current from one level to another

A

True

90
Q

True or False

Ark voltage is generally between 10 V to 35 V

A

True

91
Q

True or False

An engine driven welding machine initial purchase operating and maintenance cost are lower than those of a static welding machine of the same current output per hour of operation

A

False

92
Q

True or False

A welding machine with a 60% duty cycle can operate rated output of 6 min of 10 min without overheating

A

True

93
Q

True or False

The jaws of an electrode holder are insulated to prevent accidental flashing

A

True

94
Q

True or False

The workpiece lead is connected to the workpiece or to the workbench

A

True

95
Q

True or False

Pant cuffs are useful to protect the welder shoes for molten metal

A

False

96
Q

True or False

SMAW is the most efficient process in terms of the amount of time it takes to lay down a weld

A

False

97
Q

True or False

Duty cycle is the percentage of time during a 24 hour period that a welding machine can be operated at its rated load without exceeding the temperature limits of the insulation on the component parts

A

False

98
Q

True or False

DC current used for welding can only be direct current electrode positive (DCEP)

A

False

99
Q

An ______ is the basic unit of measurement of resistance

A

Ohm

100
Q

After the arc is struck, the voltage drops to

Dynamic electricity

Arc voltage

A

Arc voltage

101
Q

Welding in DCEP electrons flow from the

A

Workpiece to the electrode

102
Q

When performing SMAW, the general recommendation for adequate ventilation is a minimum of ______ cu feet of air per minute per welding machine

250

1500

750

2000

A

2000

103
Q

Nema has a set standard for duty cycles based on a _____ period

A

10 min

104
Q

The number______ in the second to last position of a WS electrode classification indicates that the electro can be used in all positions 

A

1

Welding Theory Test One (1 decks)

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