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Welder 1 > Module 12 electricity > Flashcards

Module 12 electricity 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

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
Q

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

A

B) transformer rectifier

26
Q

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

A

D) cycle

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

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

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

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

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

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

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

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

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

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

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

38
Q

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

A

C) DC

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) and AC alternator has no fixed polarity

A

D) and AC alternator has no fixed polarity

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

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

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

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

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

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

Welder 1 (20 decks)

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