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
2
Q
This term describes the influence exerted by a magnetic field on 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 a conductor when current is flowing A)Resistors B)Electrons C)Conductors D) Rectifiers
A
B)Electrons
4
Q
What term describes the NEMA rating of a welding machine A)Duty cycle B)Direct current C)Arc voltage D) Amperage
A
A)Duty cycle
5
Q
Electrode positive means A)Straight polarity B)Reverse polarity C)AC transformer D) Alternating current
A
B)Reverse polarity
6
Q
Electrons have a… Charge A)Neutral B)12 V 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 parts for current to flow through A)Cycle B)Circuit C)Conductor D) Core
A
C)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 a material that can stop current flow through its self 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
When current flows through 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
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
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
15
Q
Electrode negative is: A)Straight polarity B)Reverse polarity C)AC transformer D) Alternating current
A
A)Straight polarity
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
What 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 voltage B)Volt-amp curve C)Electromotive force D) Duty cycle
A
B)Volt-amp curve
19
Q
When no current is flowing in the circuit but the machine is turned on you can measure the: A)Open circuit voltage B)Constant current C)Alternating current D) Volt-amp curve
A
A)Open circuit voltage
20
Q
The speed at which a C 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
A)Resistance
22
Q
In welding, this term describes what is created when there is enough amperage and voltage overcoming the natural resistance to the flow of the electricity. A)Amp B)Volt C)Cycle D) Arc
A
D) Arc
23
Q
What phase of power supplies most industrial applications A)Single phase power B)To phase power C)Three phase power D) For phase power
A
C)Three phase power
24
Q
This welding machine transforms AC to DC. A)Line transformer B)Transformer rectifier C)DC generator D) AC transformer
A
D) AC transformer
25
Q
This term describes one complete revolution of the AC alternator A)Circuit B)Core C)Coil D) cycle
A
D) cycle
26
Q
What happens when mechanical energy is applied to a conductor and 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
27
Q
What is an advantage of an inverter welding machine A)Small and light weight B)Generally cheaper to buy C)Portability D) Function well in a dirty environment
A
A)Small and light weight
28
Q
What is a disadvantage of an inverter welding machine?
A)Poor arc starting characteristics
B)Higher input power requirements
C)Hire initial cost than transformers or rectifiers
D) Cannot be configured for automation
A
C)Hire initial cost than transformers or rectifiers
