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Welding First year AIT Electricity > Electricity Self Test > Flashcards

Electricity Self Test Flashcards

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1
Q

This term describes a noisy, uncontrollable arc that flares from side to side.

a) arc voltage
b) arc blow
c) inductance
d) resiststance

A

b) arc blow

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2
Q

This term describes the influence excerted by a magnetic field on 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 a conductor when current is flowing.

a) resistor
b) electrons
c) conductors
d) rectifiers

A

b) electrons

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4
Q

Which term describes the NEMA rating of a welding machine?

a) duty cycle
b) reverse polarity
c) arc voltage
d) amperage

A

a) duty cycle

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5
Q

Electrode positive means:

a) straight polarity
b) reverse polarity
c) AC transformer
d) alternating current

A

b) reverse polarity

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6
Q

Electrons have a ________ 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 a electrical path for current to flow through?

a) cycle
b) circuit
c) conductor
d) core

A

b) circuit

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9
Q

The electron flow theory states that electrons move from ______

a) positive to negative
b) negative to positive

A

a) positive to negative

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10
Q

The tern that descibes a 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 blow
c) arc voltage
d) inductance

A

c) arc voltage

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12
Q

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

a) a magnetic field
b) reverse polarity
c) transformer rectifier
d) duty cycle

A

a) a magnetic field

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13
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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14
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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15
Q

Electrode negative is

a) straight polarity
b) reverse polarity
c) ac transformer
d) alternating current

A

a) straight polarity

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16
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

17
Q

Which term describes a piece of equipment used to create electricity of sufficient volume for welding

a) inductor
b) resistor
c) transformer
d) generator

A

d) generator

18
Q

Which is a graphical illustration that plots the relationship between voltage and amperage output of a welding power source?

a) open circuit
b) volt-amp curve
c) elecrtomtove force
d) duty cycle

A

b) volt amp curve

19
Q

When no current is flowing in the circuit but the machine is turned you can measure the

a) open circuit voltage
b) volt amp curve
c) alternating current
d) volt amp curve

A

a) open circuit voltage

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
b) inductance
c) voltage
d) amperage

A

d) amperage

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 the electricity

a) amp
b) volt
c) cycle
d) arc

A

d) arc

23
Q

List three advantages of three phase system over single phase systems

A

a) constant power
b) smaller equipment
c) more efficient

24
Q

What phase of power supplies most industrial applications

a) single phase
b) tow 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 a 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 any the use of a primary and secondary coil

a) AC transformer
b) AC generator
c) DC generator
d) AC alternator

A

d) AC alternator

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 a AC transformer welding machine?

a) turbine whine
b) high pitched scream
c) buzz box
d) whisper quiet

A

c) buzz box

31
Q

The type of welding machine that 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 the primary winding fails
c) to step down the voltage
d) to step up 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 inclusion

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 the welding speed on aluminum
d) to change DC to AC

A

a) to change AC to DC

35
Q

What is one advantage to an AC-DC transformer rectifier welding machine?

a) arc blow is not a problem
b) the purchase price is lower than for a transformer
c) you have choice of polarity
d) it does not have to be kept clean or cool

A

c) you have a choice of polarity

36
Q

A DC motor generator produces what type of welding current

a) rectifies
b) AC
c) DC
d) high frequency

A

c) DC

Welding First year AIT Electricity (1 decks)

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