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120102b Flashcards

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

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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

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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

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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

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5
Q

Electro positive;
A) straight polarity
B) reverse polarity
C) AC transformer
D) alternating current

A

B) reverse polarity

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6
Q

Electrons have________ charge.
A) neutral
B) 12 Volt
C) positive
D) negative

A

D) negative

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7
Q

Which term measures the strength of a current of electricity
A) amperage
B) voltage
C) electron
D) inductance

A

A) amperage

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8
Q

What term describes a medium that provides an electrical path for current to flow through?

A

Conductor

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9
Q

The electron flow theory states that electrons move from
A) positive to negative
B)negative to positive

A

B)negative to positive

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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

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11
Q

Which term describes the voltage output of the machine during welding
A) arc rectification
B) arc below
C) arc voltage
D) inductance

A

C) arc voltage

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12
Q

Which term describes the voltage output of the machine during welding
A) arc rectification
B) arc below
C) arc voltage
D) inductance

A

C) arc voltage

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13
Q

When current flows through a coil wrapped around an iron core what is created?

A

A magnetic field

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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

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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

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16
Q

Electrode negative is:
A) straight polarity
B) reverse polarity
C) AC transformer
D) alternating current

A

A) straight polarity

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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

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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

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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

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20
Q

The speed at which AC changes direction is called the
A) voltage
B) amperage
C) frequency
D) resistance

A

C) frequency

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21
Q

This term describes the property of an electrical conductor that opposes the flow of current

A

Resistance

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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

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23
Q

List three advantages of three phase systems over single phase systems

A

Constant power
Smaller equipment
More efficient

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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

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25
Q

This welding machine transforms AC to DC
A) line transformer
B) transformer rectifier
C) DC generator
D) AC transformer

A

B) transformer rectifier

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26
Q

This term describes one complete revolution of the AC alternator
A) circuit
B) core
C) coil
D) cycle

A

D) cycle

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27
Q

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

A

B) electrical current is generated

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28
Q

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

A) AC transformer

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29
Q

What does EMF stand for?
A) electron movement force
B) elementary motor force
C) electromotive force
D) electromotive factor

A

C) electromotive force

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30
Q

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

A

C) buzz box

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31
Q

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

A

D) inverter

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32
Q

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

A

C) to step down the voltage

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33
Q

One advantage of an AC transformer welder is freedom from
A) undercut
B) arc blow
C) porosity
D) slag inclusions

A

B) arc blow

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34
Q

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

A) to change AC to DC

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35
Q

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

A

C) you have a choice of polarity

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36
Q

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

A

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37
Q

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

A

C

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38
Q

A DC motor generator produces what type of welding current?
A) rectified
B) AC
C) DC
D) high frequency

A

C) DC

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39
Q

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

A

D) an AC alternator has no fixed polarity

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40
Q

What is one advantage of an engine driven generator welding machine?
A) lower cost
B) portability
C) less noise
D) less maintenance

A

B) portability

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41
Q

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

A) the maintenance cost are lower

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42
Q

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

A

D) inverters

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43
Q

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

A

C) inverter technology

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44
Q

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

A) small and lightweight

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45
Q

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

A

C) higher initial cost than transformers or rectifiers

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46
Q

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

A

b) alternating current

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47
Q

_________ is also known as the heat setting.
a) circuit
b) core
c) amperage
d) voltage

A

c) amperage

Amperage causes the electrode/parent metal to be melted & is responsible for metal deposition rate and penetration

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48
Q

________ causes the electrode/parent metal to be melted & is responsible for metal deposition rate and penetration
a) circuit
b) core
c) amperage
d) voltage

A

c) amperage

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49
Q

__________ is also known as burn off rate.
a) core
b) buz box
c) metal burn off rate
d) arc blow

A

c) metal burn off rate

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50
Q

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

A

b) amperage

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51
Q

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

a) arc

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52
Q

__________ 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

A

b) arc blow

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53
Q

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

A

d) current flow

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54
Q

__________ 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

a) arc voltage

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55
Q

What is another name for AC transformer?

A

Buzz Box

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56
Q

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

A

b) circuit

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57
Q

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

a) core

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58
Q

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

A

c) moveable shunt

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59
Q

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

a) coil

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60
Q

A ______ is a material or substance that is capable of transmitting electricity.

A

conductor

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61
Q

What power source is used for SMAW & GTAW
a) CC
b) CV
c) DCEP
d) DCSP

A

a) CC

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62
Q

What is another term for constant potential?
a) CC
b) CV
c) DC
d) AC

A

b) CV

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63
Q

Which power source produces an almost flat volt amp curve?
a) CC
b) CV
c) DC
d) AC

A

b) CV

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64
Q

__________ is the movement of electrons in and electrical circuit, & is measured in amperes.
a) relay
b) cycle curve
c) current flow
d) amperage flow

A

c) current flow

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65
Q

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

A

b) cycle

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66
Q

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

A

b) 120

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67
Q

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

A

c) diode

68
Q

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

A

d) AC to DC

69
Q

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

A

b) DC

70
Q

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

A

b) negative to positive

71
Q

All welding machines are rated by the National Electrical Manufacturers Association
a) ANSI
b) NEMA
c) ASA
d) CSA

A

b) NEMA

72
Q

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

A

b) 10 min time period

73
Q

Electrons are negatively charged particles that move through a ______ when current is flowing.
a) inverter
b) diode
c) cathode
d) conductor

A

d) conductor

74
Q

________ relates to the speed at which alternating current changes its direction of flow.
a) inductance
b) electron
c) frequency
d) magnetic field

A

c) frequency

75
Q

A _______ is a machine used to create electricity of sufficient volume for welding.
a) insulator
b) inverter
c) generator
d) line transformer

A

c) generator

76
Q

_________ 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

A

b) inductance

77
Q

An _________ is any material that does not allow current to flow through it.

A

Insulator

78
Q

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

A

c) inverter

79
Q

A line transformer is another term used to describe an ____ transformer welding machine.
a) AC
b) DC
c) AV
b) DV

A

a) AC

80
Q

Current flow is measured by
a) volts
b) amps
c) ohms
d) frequency

A

b) amps

81
Q

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

A

d) open circuit voltage`

82
Q

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

a) primary coil

83
Q

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

A

d) rectifier

84
Q

A _______ is a switch that is operated by electro-mechanical force
a) switch
b) relay
c) magnetic field
d) primary coil

A

relay

85
Q

What is resistance measured in?
a) volts
b) amps
c) ohms
d) frequency

A

c) ohms
ohms = V/A

86
Q

What is the basic formula to calculate resistance?

A

Ohms= V/A
Ohms = (volts divided by amps)

87
Q

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.

A

True

88
Q

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.

A

True

89
Q

A _______ is a device with points of contact that can complete a circuit.
a) switch
b) relay
c) magnetic field
d) primary coil

A

a) switch

90
Q

___________ 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

A

b) voltage

91
Q

What is another term for Voltage?

A

EMF
Electromotive force

92
Q

What does EMF stand for ?
a) electro magnetic force
b) electromotive force
c) electrostatic force
d) electric and magnetic forces

A

b) electromotive force

93
Q

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

A

c) CC

94
Q

What must be present to maintain an arc?

A

Arc voltage

95
Q

_______ 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

A

c) arc voltage

96
Q

A drooping volt amp curve depicts a current for
a) DC
b) AC
c) CC
d) CV

A

c) CC
used with SMAW & GTAW

97
Q

A flat volt amp curve depicts a current for:
a) DC
b) AC
c) CC
d) CV

A

d) CV used for most wire feed welding processes

98
Q

The ______ lines represent constant current machines used for SMAW and GTAW.
Open circuit voltage
a) dotted lines
b) solid lines

A

a) dotted lines

99
Q

__________ 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

a) AC

100
Q

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

A

b) 120 times per second

101
Q

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)

A

c) filler metal type

102
Q

Where is single phase power used?
Industrial or residential

A

residential and small business areas

103
Q

Single phase AC operates at _____ cycles per second.
a) 20
b) 40
c) 60
d) 80

A

c) 60

104
Q

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

A

c) three phase AC power

105
Q

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.

A

True

106
Q

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

A

c) AC transformer

107
Q

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

A

c) step down voltage

108
Q

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

A

c) fine, laminated

109
Q

Name 2 variations of adjustable coil transformers

A

adjustable coil set up transformer
metal shunt adjustable coil

110
Q

What are 2 advantages of AC transformers?

A

Low maintenance cost
No accumulative arc blow

1 disadvantage - no choice of polarity

111
Q

AC transformers come in current ranges of
a) 20 - 200 amps
b) 40-200
c) 20 - 225
d) 40-225

A

d) 40-225

112
Q

True or False?
AC-DC transformer-rectifier welding machines are AC transformers with an added rectifier.

A

True

113
Q

What unit are the pictured advantages and disadvantages describing?
a) DC Transformer
b) AC Transformer
c) AC-DC Transformer - rectifier
d) AC-DC Transformer

A

c) AC-DC Transformer - rectifier

114
Q

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

A

b) DC, AC

115
Q

A practical application of an induced current is a ___________
a) inducer
b) inductor
c) generator
d) alternator

A

c) generator

116
Q

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

A

b) portability

117
Q

What is another name for a split ring?
a) jump ring
b) divided ring
c) commutator
d) split clip

A

c) commutator

118
Q

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

A

c) commutator

119
Q

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

A

c) DC Generator & Alternator

120
Q

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

A

c) voltage and amperage

121
Q

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

A

CC
It is advantageous to use a system like this when in remote locations when you need to use GMAW or FCAW

122
Q

An ________ is an electronic circuit that is capable of transforming DC input to AC output.
a) diverter
b) inverter
c) generator
d) alternator

A

b) inverter

123
Q

What machine is the picture describing?
a) diverter
b) inverter
c) generator
d) alternator

A

b) inverter

124
Q

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

A

rectify, frequency, frequency, DC

125
Q

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

A

b) inverter’s

126
Q

What unit are the pictured advantages and disadvantages describing?
a) diverter
b) inverter
c) generator
d) alternator

A

b) inverter

127
Q

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

a step or tap control

128
Q

How many times is current rectified in an inverter welding machine:
1
2
3
4

A

2

129
Q

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

A
  • is to allow current to flow in one direction only
130
Q

The pressure in an electrical circuit is called:
ohms
current
resistance
electromotive force

A

electromotive force

131
Q

A drooping type volt-amp curve is used for:
CC
CV
Constant Potential
Constant Amperage

A

CC

132
Q

Voltage controls the:
fluidness & burn off rate
burn off rate and penetration
ease of arc striking & fluidity
penetration and ease of arc striking

A

ease of arc striking & fluidity

133
Q

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

A
  • all of the above
134
Q

Which welding machine immediately rectifies the incoming AC current to DC?
inverter
DC generator
CC
AC transformer with high frequency

A

inverter

135
Q

The most economical electric welder to buy and operate is the:
* AC generator
* DC generator
* AC-DC rectifier welder
* AC transformer welder

A
  • AC transformer welder
136
Q

The most versatile machine for the greatest choice of electrodes would be
* AC generator
* DC generator
* AC-DC rectifier
*AC transformer

A
  • AC-DC rectifier
137
Q

An AC transformer type welder:
is portable
has a high purchase price
doesn’t have an arc blow problem
gives max selection of electrodes

A

doesn’t have an arc blow problem

138
Q

A rectifier welder can be a(an)
AC welder only
DC welder only
AC generator welder
Combination AC-DC welder

A

Combination AC-DC welder

139
Q

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

A

*fewer wraps of heavier wire than the primary coil

140
Q

The property in an electrical conductor that opposes the flow of current is:
current
frequency
resistance
inductance

A

resistance

141
Q

Which of the following has a direct bearing on puddle flow in the weld?
current
amperage
arc voltage
open circuit voltage

A

arc voltage

142
Q

The internal components of an electrical welding machine may be cleaned with high volume and low pressure air
T/F

A

True

143
Q

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

A

arc voltage

144
Q

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

A
  • by the way the arc flares from side to side
145
Q

An AC transformer welding machine will produce:
*no fixed polarity
* reverse polarity
* straight polarity
* high frequency

A

*no fixed polarity

146
Q

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

A
  • electronic components are fragile
147
Q

What type of welding process would represent a flat volt amp curve?
GMAW
MCAW
SAW
all of the above

A

all of the above

148
Q

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

A
  • all of the above
149
Q

Electromotive force in an electrical circuit is the:
ohms
voltage
current
amperage

A

voltage

150
Q

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

A
  • interchange the welding cables
151
Q

What is the force that causes current to flow in a conductor?
amperage
gravity
voltage
ohms

A

amperage

152
Q

There is no fixed polarity with:
stud welders
DC inverters
DC generators
AC transformers

A

AC transformers

153
Q

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

A
  • is based on max output in a 10 min period
154
Q

What kind of welding machine will permit adjusting the voltage and amperage independently?
AC rectifier
AC Alternator
AC High Frequency
DC generator dual controls

A

DC generator dual controls

155
Q

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

A
  • avoid shock to the operator
156
Q

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

A
  • the negative terminal of the welder
157
Q

Another name for constant potential
constant flow
constant voltage
constant current
constant amperage

A

constant voltage

158
Q

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

A
  • the electrode is negative, and the work is positive
159
Q

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

A

120 times per second

160
Q

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

A
  • an AC transformer type welding machine
161
Q

The voltage output of a machine while welding is being done is known as:
arc voltage
resistance voltage
open circuit voltage
closed circuit voltage

A

arc voltage

162
Q

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

A
  • increased puddle fluidity
163
Q

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

A
  • dust contamination in the machine
164
Q

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

A

volt amp curve

165
Q

A DC rectifier machine designed for SMAW will have :
rising amp curve
constant current curve
constant voltage curve
drooping volt amp curve

A

drooping volt amp curve

Welder 1 (40 decks)

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