120102b Flashcards
(165 cards)
1
Q
This term describes a noisy uncontrollable arc that flares from side to side:
A) arc voltage
B) arc blow
C) inductance
D) resistance
A
B) arc blow
2
Q
This term describes the influence exerted by magnetic field neighbouring bodies without physical contact
A) voltage
B) amperage
C) frequency
D) inductance
A
D) inductance
3
Q
This is the fundamental unit of electricity that moves through conductor when current is flowing
A) resistors
B) electrons
C) conductors
D) rectifiers
A
B) electrons
4
Q
Which term describes NEMA rating of a welding machine?
A) duty cycle
B) direct current
C) arc voltage
D) amperage
A
A) duty cycle
5
Q
Electro positive;
A) straight polarity
B) reverse polarity
C) AC transformer
D) alternating current
A
B) reverse polarity
6
Q
Electrons have________ charge.
A) neutral
B) 12 Volt
C) positive
D) negative
A
D) negative
7
Q
Which term measures the strength of a current of electricity
A) amperage
B) voltage
C) electron
D) inductance
A
A) amperage
8
Q
What term describes a medium that provides an electrical path for current to flow through?
A
Conductor
9
Q
The electron flow theory states that electrons move from
A) positive to negative
B)negative to positive
A
B)negative to positive
10
Q
This term describes the material that can stop current flow through itself
A) inductor
B) inverter
C) conductor
D) insulator
A
D) insulator
11
Q
Which term describes the voltage output of the machine during welding
A) arc rectification
B) arc blow
C) arc voltage
D) inductance
A
C) arc voltage
12
Q
Which term describes the voltage output of the machine during welding
A) arc rectification
B) arc blow
C) arc voltage
D) inductance
A
C) arc voltage
13
Q
When current flows through a coil wrapped around an iron core what is created?
A
A magnetic field
14
Q
This device in a welding machine is designed to have a certain number of turns of wire
A) circuit
B) core
C) coil
D) cycle
A
C) coil
15
Q
The main function of this device is to change AC to DC
A) resistor
B) rectifier
C) relay
D) reactor
A
B) rectifier
16
Q
Electrode negative is:
A) straight polarity
B) reverse polarity
C) AC transformer
D) alternating current
A
A) straight polarity
17
Q
This current flows in one direction only and has either a positive or negative value:
A) direct current
B) alternating current
C) open circuit voltage
D) arc voltage
A
A) direct current
18
Q
Which term describes a piece of equipment used to create electricity sufficient volume for welding
A) inductor
B) resistor
C) transformer
D) generator
A
D) generator
19
Q
Which is a graphical illustration that plots the relationship between voltage and amperage output of a welding power source
A) open circuit voltage
B) volt amp curve
C) electromotive force
D) duty cycle
A
B) volt amp curve
20
Q
The speed at which AC changes direction is called the
A) voltage
B) amperage
C) frequency
D) resistance
A
C) frequency
21
Q
This term describes the property of an electrical conductor that opposes the flow of current
A
Resistance
22
Q
In welding, this term describes what is created when there is enough amperage and voltage to overcome the natural resistance to the flow of electricity
A
Arc
23
Q
List three advantages of three phase systems over single phase systems
A
Constant power
Smaller equipment
More efficient
24
Q
What phase of power supplies most industrial applications?
A) single phase
B) two phase
C) three phase
D) four phase
A
C) three phase
25
This welding machine transforms AC to DC
A) line transformer
B) transformer rectifier
C) DC generator
D) AC transformer
B) transformer rectifier
26
This term describes one complete revolution of the AC alternator
A) circuit
B) core
C) coil
D) cycle
D) cycle
27
What happens when mechanical energy is applied to a conductor and it moves across the magnetic lines of force in a magnetic field
A) magnetism is generated
B) electrical current is generated
C) single phase power is generated
D) three phase power is generated
B) electrical current is generated
28
These machines convert high voltage low amperage to low voltage high amperage by the use of a primary and secondary coil
A) AC transformer
B) AC generator
C) DC generator
D) AC alternator
A) AC transformer
29
What does EMF stand for?
A) electron movement force
B) elementary motor force
C) electromotive force
D) electromotive factor
C) electromotive force
30
Which term describes the typical sound of an AC transformer, welding machine?
A) turbine whine
B) high-pitched scream
C) buzz box
D) whisper, quiet
C) buzz box
31
This type of welding machine is capable of changing DC to high frequency AC
A) AC generator
B) DC rectifier
C) DC generator
D) inverter
D) inverter
32
What is the function of the secondary winding on a transformer welder?
A) to induce high frequency current
B) to serve as a back up in case of primary winding fails
C) to step down the voltage
D) to step down the amperage
C) to step down the voltage
33
One advantage of an AC transformer welder is freedom from
A) undercut
B) arc blow
C) porosity
D) slag inclusions
B) arc blow
34
What is the purpose of a silicon controlled rectifier?
A) to change AC to DC
B) to change single phase to three phase
C) to increase welding speed on aluminum
D) to change DC to AC
A) to change AC to DC
35
What is one advantage of an AC – DC transformer – rectifier welding machine?
A) below is not a problem
B) the purchase price is lower than for a transformer
C) you have a choice of polarity
D) it does not have to be kept clean and cool
C) you have a choice of polarity
36
Figure 33 on page 35 the output, voltage or current wave form to a load from a generator that uses slip rings is indicated by which diagram
A
B
C
A
37
In figure 33 on page 35, the output voltage or current wave form to a load from a generator that uses a commutator is indicated by which diagram
A
B
C
C
38
A DC motor generator produces what type of welding current?
A) rectified
B) AC
C) DC
D) high frequency
C) DC
39
How can you change the polarity on an AC alternator welding machine??
A) switch the cables at the machine
B) reverse the direction of the motor
C) change the polarity taps on the reactor coils
D) an AC alternator has no fixed polarity
D) an AC alternator has no fixed polarity
40
What is one advantage of an engine driven generator welding machine?
A) lower cost
B) portability
C) less noise
D) less maintenance
B) portability
41
What is one advantage of all transformer, welding machines?
A) the maintenance cost are lower
B) there is no choice of polarity
C) they are not portable
D) the choice of electrotype is narrow
A) the maintenance cost are lower
42
These welding power sources immediately rectify the incoming AC to DC and then transistors create a higher frequency AC. The higher frequency AC is then rectified to extremely smooth DC.
A) Transformers
B) generators
C) buzz boxes
D) inverters
D) inverters
43
How did manufacturers reduce the size and weight of transformers and generates significant energy savings over conventional power sources?
A) rectifier technology
B) generator technology
C) inverter technology
D) transformer technology
C) inverter technology
44
What is an advantage of an inverter welding machine?
A) small and lightweight
B) generally cheaper to buy
C) portability
D) functions well in a dirty environment
A) small and lightweight
45
What is a disadvantage of an inverter welding machine?
A) poor arc starting characteristics
B) higher input power requirements
C) higher initial cost than transformers or rectifiers
D) cannot be configured for automation
C) higher initial cost than transformers or rectifiers
46
Current that flows in one direction during any half cycle, then reverses and flows in the opposite direction during the next half cycle is called?
a) alternating voltage
b) alternating current
c) alternating circuit
d) alternating cycle
b) alternating current
47
_________ is also known as the heat setting.
a) circuit
b) core
c) amperage
d) voltage
c) amperage
Amperage causes the electrode/parent metal to be melted & is responsible for metal deposition rate and penetration
48
________ causes the electrode/parent metal to be melted & is responsible for metal deposition rate and penetration
a) circuit
b) core
c) amperage
d) voltage
c) amperage
49
__________ is also known as burn off rate.
a) core
b) buz box
c) metal burn off rate
d) arc blow
c) metal burn off rate
50
Increasing _________ causes the arc to penetrate into the parent metal; lowering the ________ causes a decrease in penetration.
a) voltage
b) amperage
c) DCEP
d) DCEN
b) amperage
51
An _____ is created when there is enough amperage and voltage available at the electrode tip to overcome the natural resistance to the flow of electricity.
a) arc
b) circuit
c) cycle
d) current flow
a) arc
52
__________ is a condition encountered when using DC when the arc flares uncontrollably from side to side. This causes magnetic fields being set up around the work.
a) arc
b) arc blow
c) cycle
d) current flow
b) arc blow
53
Arc blow is not a problem with AC because the reversals in the direction of the _________ prevent the accumulation of magnetic fields being set up.
a) arc
b) arc blow
c) cycle
d) current flow
d) current flow
54
__________ is the voltage output of the machine during welding.
It is the force that maintains the arc between the electrode and the workpiece.
a) arc voltage
b) circuit voltage
c) core voltage
d) current flow
a) arc voltage
55
What is another name for AC transformer?
Buzz Box
56
Any system of conductors that is designed to complete the path of an electric current is called a _______
a) core
b) circuit
c) diode
d) moveable shunt
b) circuit
57
The _______ is the magnetic link between the primary and the secondary coils of a welding transformer.
a) core
b) circuit
c) diode
d) moveable shunt
a) core
58
The core is the magnetic link between the primary and the secondary coils of a welding transformer. The core can be moved into or out of the coil as a method of current control.
This type of current control is called?
a) rectifier
b) buzz box
c) moveable shunt
d) relay
c) moveable shunt
59
A ______ is usually made of insulated copper wire and is designated to have a certain number of turns of wire.
a) coil
b) circuit
c) diode
d) moveable shunt
a) coil
60
A ______ is a material or substance that is capable of transmitting electricity.
conductor
61
What power source is used for SMAW & GTAW
a) CC
b) CV
c) DCEP
d) DCSP
a) CC
62
What is another term for constant potential?
a) CC
b) CV
c) DC
d) AC
b) CV
63
Which power source produces an almost flat volt amp curve?
a) CC
b) CV
c) DC
d) AC
b) CV
64
__________ is the movement of electrons in and electrical circuit, & is measured in amperes.
a) relay
b) cycle curve
c) current flow
d) amperage flow
c) current flow
65
A ______ is one complete rotation of the sine wave pattern.
The current changes direction 120 times per second.
a) current
b) cycle
c) single phase power
d) three phase power
b) cycle
66
A cycle is one complete rotation of the sine wave pattern.
The current changes direction _____ times per second.
a) 100
b) 120
c) 200
d) 220
b) 120
67
A _____ is a one way electrical valve.
It allows current to flow in one direction only. In a welding machine, ______ are used to change AC to DC.
a) cycle
b) solonid
c) diode
d) coil
c) diode
68
A diode is a one way electrical valve.
It allows current to flow in one direction only. In a welding machine, diode are used to change _____to _____?
a) DCRP to DCEP
b) DCSP to DCEN
c) DC to AC
d) AC to DC
d) AC to DC
69
Electric current that flows in one direction only and has either a positive or negative value is _____
a) AC
b) DC
c) DV
d) AV
b) DC
70
The electron theory states that current flows from_____ to _____, since that is the direction that electrons flow in.
a) positive to negative
b) negative to positive
c) they flow to the side with the least electrons to become equal
d) they are in their current position and do not move
b) negative to positive
71
All welding machines are rated by the National Electrical Manufacturers Association
a) ANSI
b) NEMA
c) ASA
d) CSA
b) NEMA
72
The rating, called the duty cycle, is based on maximum output over a _______ time period. This rating is expressed as a percentage of the time that the machine can run at maximum rated output current before it must be allowed to cool down.
a) 5 min time period
b) 10 min time period
c) 30 min time period
d) 60 min time period
b) 10 min time period
73
Electrons are negatively charged particles that move through a ______ when current is flowing.
a) inverter
b) diode
c) cathode
d) conductor
d) conductor
74
________ relates to the speed at which alternating current changes its direction of flow.
a) inductance
b) electron
c) frequency
d) magnetic field
c) frequency
75
A _______ is a machine used to create electricity of sufficient volume for welding.
a) insulator
b) inverter
c) generator
d) line transformer
c) generator
76
_________ is the ability of a conductor to transfer current onto a neighbouring body without physical contact.
a) single phase power
b) inductance
c) three phase power
d) electron flow
b) inductance
77
An _________ is any material that does not allow current to flow through it.
Insulator
78
An ________ is a device that changes DC to AC. In welding machines, _______ are also used to increase the frequency of AC.
a) rectifier
b) generator
c) inverter
d) transformer
c) inverter
79
A line transformer is another term used to describe an ____ transformer welding machine.
a) AC
b) DC
c) AV
b) DV
a) AC
80
Current flow is measured by
a) volts
b) amps
c) ohms
d) frequency
b) amps
81
When a welding machine is turned on, but no current is flowing in the circuit, the machine has _______ at the output terminals.
a) closed circuit amperage
b)closed circuit voltage
c) open circuit amperage
d) open circuit voltage
d) open circuit voltage`
82
The _________ on a welding transformer takes power directly from the AC input power line. The current flowing into the primary coil causes a magnetic field to form.
a) primary coil
b) transformer coil
c) inductor
d) relay
a) primary coil
83
A ______ is a device that changes AC to DC by allowing current to flow in one direction only
a) transformer
b) relay
c) primary coil
d) rectifier
d) rectifier
84
A _______ is a switch that is operated by electro-mechanical force
a) switch
b) relay
c) magnetic field
d) primary coil
relay
85
What is resistance measured in?
a) volts
b) amps
c) ohms
d) frequency
c) ohms
ohms = V/A
86
What is the basic formula to calculate resistance?
Ohms= V/A
Ohms = (volts divided by amps)
87
True or False
Using reverse polarity results in the following electrode and arc characteristics as compared to straight polarity.
* The electrode melts somewhat slower, which allows slower welding speeds.
* Approximately two thirds of the arc energy is associated with the base metal (negative terminal).
* Penetration is deeper.
* Metal flow is generally narrow.
True
88
True or False
Using straight polarity results in the following electrode and arc characteristics as compared to reverse polarity.
* The electrode melts somewhat faster, resulting in faster welding speeds.
Approximately two thirds of the arc energy is associated with the electrode (negative terminal).
Penetration is shallow.
Metal flow is somewhat wider.
True
89
A _______ is a device with points of contact that can complete a circuit.
a) switch
b) relay
c) magnetic field
d) primary coil
a) switch
90
___________ is the electrical pressure or force that causes current to flow in a conductor or to cross an arc gap. Voltage is often called EMF, which stands for electromotive force.
Voltage in arc welding is responsible for the following:
* starting the arc,
* maintaining the arc,
* puddle fluidity and
* puddle flow.
a) amperage
b) voltage
c) electron flow
d) open circuit voltage
b) voltage
91
What is another term for Voltage?
EMF
Electromotive force
92
What does EMF stand for ?
a) electro magnetic force
b) electromotive force
c) electrostatic force
d) electric and magnetic forces
b) electromotive force
93
With ______ welding machines, open circuit voltage needs to be quite high (50 to 100 volts) to initiate an arc. Once the arc is established, the voltage will drop to a welding voltage. Both voltage and amperage are present in the circuit.
a) CV
b) CA
c) CC
d) DC
c) CC
94
What must be present to maintain an arc?
Arc voltage
95
_______ directly affects the width of the weld bead and the fluidity or wetness of the puddle. An increase in ________ causes an increase in puddle width and fluidity;
a) starting arc
b) arc amperage
c) arc voltage
d) closing arc
c) arc voltage
96
A drooping volt amp curve depicts a current for
a) DC
b) AC
c) CC
d) CV
c) CC
used with SMAW & GTAW
97
A flat volt amp curve depicts a current for:
a) DC
b) AC
c) CC
d) CV
d) CV used for most wire feed welding processes
98
The ______ lines represent constant current machines used for SMAW and GTAW.
Open circuit voltage
a) dotted lines
b) solid lines
a) dotted lines
99
__________ flows in one direction during any half cycle, then reverses and flows in the opposite direction during the next half cycle.
a) AC
b) DC
c) CC
d) CV
a) AC
100
In North America you use a 60-cycle AC power source.
One sine wave will change electron flow two times, so 60 sine waves or cycles will change direction ______ times each second.
a) 60
b) 120
c) 180
d) electrons dont change direction they continue on the original path
b) 120 times per second
101
The selection of DCEP, DCEN or AC depends on the ________, the material being welded and the welding process used.
a) shielding gas being used
b) base metal composition
c) filler metal type
d) type of phase power being used (single or three phase)
c) filler metal type
102
Where is single phase power used?
Industrial or residential
residential and small business areas
103
Single phase AC operates at _____ cycles per second.
a) 20
b) 40
c) 60
d) 80
c) 60
104
What power system is the picture depicting?
a) single phase power
b) three phase power
c) three phase AC power
d) three phase DC power
c) three phase AC power
105
Is the following statement true or false?
Three-phase power allows motors and alternators to be smaller and lighter and still achieve the same power output. This tends to reduce the cost of three-phase equipment compared to single-phase equipment.
True
106
What system is described below?
Wire coils wrapped around a laminated steel core. Where the current from the power grid flows through the primary winding and creates a magnetic field.
a) magnetic field generator
b) inducer
c) AC transformer
d) CC alternator
c) AC transformer
107
What process does this describe?
The AC transformer welding power source converts high voltage, low amperage to low voltage, high amperage that is suitable for welding.
a) metal shunt adjustable coil
b) adjustable coil set up transformer
c) step down voltage
d) step down amperage
c) step down voltage
108
Step down voltage; the primary winding consists of many wraps of ____ wire, and the secondary winding has fewer wraps of much heavier wire. Both of these wire coils are wrapped around _____ steel plates
a) heavy, coated
b) fine, coated
c) fine, laminated
d) heavy, laminated
c) fine, laminated
109
Name 2 variations of adjustable coil transformers
adjustable coil set up transformer
metal shunt adjustable coil
110
What are 2 advantages of AC transformers?
Low maintenance cost
No accumulative arc blow
1 disadvantage - no choice of polarity
111
AC transformers come in current ranges of
a) 20 - 200 amps
b) 40-200
c) 20 - 225
d) 40-225
d) 40-225
112
True or False?
AC-DC transformer-rectifier welding machines are AC transformers with an added rectifier.
True
113
What unit are the pictured advantages and disadvantages describing?
a) DC Transformer
b) AC Transformer
c) AC-DC Transformer - rectifier
d) AC-DC Transformer
c) AC-DC Transformer - rectifier
114
Generators and alternators convert mechanical energy into electrical energy. A generator produces _____, and an alternator produces ____.
a) AC, DC
b) DC, AC
c) AC, DCSP
d) AC, DCEP
b) DC, AC
115
A practical application of an induced current is a ___________
a) inducer
b) inductor
c) generator
d) alternator
c) generator
116
Generator or alternator power sources may be driven by an electric motor or petroleum driven engines. The main advantage of the petroleum engine-driven machines is _________.
a) potential energy
b) portability
c) reliability
d) cost reduction
b) portability
117
What is another name for a split ring?
a) jump ring
b) divided ring
c) commutator
d) split clip
c) commutator
118
As the armature loop rotates, the direction of the movement of each half of the loop is reversed with respect to the magnetic field
The __________, however, switches the direction of this current to maintain the same direction of the current flow to the load.
a) jump ring
b) divided ring
c) commutator
d) split clip
c) commutator
119
What unit are the pictured advantages and disadvantages describing?
a) DC Generator & Transformer
b) AC Generator & Transformer
c) DC Generator & Alternator
d) AC Generator & Alternator
c) DC Generator & Alternator
120
DC generator driven by a diesel engine with dual controls for setting ______ and _______.
a) voltage and polarity
b) amperage and polarity
c) voltage and amperage
d) voltage and amperage sensor
c) voltage and amperage
121
A suitcase welder may be used with both CC & CV power sources.
When using a volt sensor it is using which power source? CC or CV
CC
It is advantageous to use a system like this when in remote locations when you need to use GMAW or FCAW
122
An ________ is an electronic circuit that is capable of transforming DC input to AC output.
a) diverter
b) inverter
c) generator
d) alternator
b) inverter
123
What machine is the picture describing?
a) diverter
b) inverter
c) generator
d) alternator
b) inverter
124
Inverter welding power sources immediately ______ the incoming AC into DC and then transistors convert DC voltage into a high ______ AC output. The higher ______ AC is then rectified to extremely smooth _____ welding output.
Fill in the blank options that may be used multiple times.
DC, AC, Frequency, Rectify, Invert, Generate
rectify, frequency, frequency, DC
125
An _______ size and weight can be reduced, and it can still have equal current output to a conventional power source.
a) diverter's
b) inverter's
c) generator's
d) alternator's
b) inverter's
126
What unit are the pictured advantages and disadvantages describing?
a) diverter
b) inverter
c) generator
d) alternator
b) inverter
127
A method of plugging the ground and the electrode cables into terminals equipped on a buzz box welder, for amperage adjustment would define:
shunt control
rheostat control
a step or tap control
adjustable coil control
a step or tap control
128
How many times is current rectified in an inverter welding machine:
1
2
3
4
2
129
The function of a silicon diode is to:
* is to allow current to flow in one direction only
* change from single phase to three phase output
* increase frequency of AC current
* reduce arc blow
* is to allow current to flow in one direction only
130
The pressure in an electrical circuit is called:
ohms
current
resistance
electromotive force
electromotive force
131
A drooping type volt-amp curve is used for:
CC
CV
Constant Potential
Constant Amperage
CC
132
Voltage controls the:
fluidness & burn off rate
burn off rate and penetration
ease of arc striking & fluidity
penetration and ease of arc striking
ease of arc striking & fluidity
133
The selection of current used AC, DCRP, or DCSP depends on the:
* type of filler metal required
* material being welded
* welding process used
* all of the above
* all of the above
134
Which welding machine immediately rectifies the incoming AC current to DC?
inverter
DC generator
CC
AC transformer with high frequency
inverter
135
The most economical electric welder to buy and operate is the:
* AC generator
* DC generator
* AC-DC rectifier welder
* AC transformer welder
* AC transformer welder
136
The most versatile machine for the greatest choice of electrodes would be
* AC generator
* DC generator
* AC-DC rectifier
*AC transformer
* AC-DC rectifier
137
An AC transformer type welder:
is portable
has a high purchase price
doesn't have an arc blow problem
gives max selection of electrodes
doesn't have an arc blow problem
138
A rectifier welder can be a(an)
AC welder only
DC welder only
AC generator welder
Combination AC-DC welder
Combination AC-DC welder
139
The secondary windings on a transformer welder consists of:
* more wraps of heavier wire than the primary coil
* more wraps of lighter wire than the primary coil
*fewer wraps of heavier wire than the primary coil
* fewer wraps of lighter wire than the primary coil
*fewer wraps of heavier wire than the primary coil
140
The property in an electrical conductor that opposes the flow of current is:
current
frequency
resistance
inductance
resistance
141
Which of the following has a direct bearing on puddle flow in the weld?
current
amperage
arc voltage
open circuit voltage
arc voltage
142
The internal components of an electrical welding machine may be cleaned with high volume and low pressure air
T/F
True
143
What is another term than could be referred to as the rate of metal deposition
arc voltage
burn off rate
resistance rate
speed of frequency
arc voltage
144
A notable fact in determining arc blow is:
* by the way the arc flares from side to side
* how high voltage is transformed to high amperage
* the way that the welding stinger becomes instantly hot
* by watching the arc wander when welding with AC current
* by the way the arc flares from side to side
145
An AC transformer welding machine will produce:
*no fixed polarity
* reverse polarity
* straight polarity
* high frequency
*no fixed polarity
146
What is a disadvantage of an inverter power source?
* may be CC or CV
* small and light weight
* low input requirements
* electronic components are fragile
* electronic components are fragile
147
What type of welding process would represent a flat volt amp curve?
GMAW
MCAW
SAW
all of the above
all of the above
148
What is a procedure that could eliminate or minimize arc blow?
* change the ground clamp position
* use a reduced current setting
* weld towards a heavy tack
* all of the above
* all of the above
149
Electromotive force in an electrical circuit is the:
ohms
voltage
current
amperage
voltage
150
What action can cause a change in polarity on the AC-DC rectifier welding machine?
* bypass the rectifier
* interchange the welding cables
*reverse the windings in the machine
* change the power supply to the machine
* interchange the welding cables
151
What is the force that causes current to flow in a conductor?
amperage
gravity
voltage
ohms
amperage
152
There is no fixed polarity with:
stud welders
DC inverters
DC generators
AC transformers
AC transformers
153
The duty cycle of a welding machine
* is determined by the number of turns on the armature
* is based on max output in a 10 min period
* refers to the type of output current of the welder (AC or DC)
* is determined by the number of selenium plates in the rectifier
* is based on max output in a 10 min period
154
What kind of welding machine will permit adjusting the voltage and amperage independently?
AC rectifier
AC Alternator
AC High Frequency
DC generator dual controls
DC generator dual controls
155
Electric powered welding machines must be internally grounded to:
* avoid shock to the operator
* prevent cables from overheating
* prevent stray arcs from occurring
* prevent damage to circuit breaker
* avoid shock to the operator
156
When a straight polarity connection is made, the electrode cable is connected to:
* either terminal
* the positive terminal of the welder
* the negative terminal of the welder
* the larger of the two lugs for cable connections
* the negative terminal of the welder
157
Another name for constant potential
constant flow
constant voltage
constant current
constant amperage
constant voltage
158
When using straight polarity for welding
* both the electrode and the work are negative
* both the electrode and the work are positive
* the electrode is negative, and the work is positive
* the electrode is positive and the work is negative
* the electrode is negative, and the work is positive
159
A welding transformer power source produces current that changes direction
30 times per second
60 times per second
90 times per second
120 times per second
120 times per second
160
A line transformer is a term to describe:
* an AC transformer type welding machine
* a device used to produce electrical power
* melting metal at the edge of the weld
* a small breaker switch
* an AC transformer type welding machine
161
The voltage output of a machine while welding is being done is known as:
arc voltage
resistance voltage
open circuit voltage
closed circuit voltage
arc voltage
162
Increasing voltage on the welding machine will cause:
* a reduction in metal transfer
* the puddle to solidify faster
* increased puddle fluidity
* a loss of control
* increased puddle fluidity
163
Welding machines should be located away from corners and walls to reduce:
* dust contamination in the machine
* a fire hazard caused by the machine
* smoke accumulation in confined areas
* the distance from the central welding location
* dust contamination in the machine
164
A graphical illustration depicting electrical output of an arc welding machine is called a:
volt amp curve
voltage output diagram
amperage density graph
performance utilization chart
volt amp curve
165
A DC rectifier machine designed for SMAW will have :
rising amp curve
constant current curve
constant voltage curve
drooping volt amp curve
drooping volt amp curve
