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
```
This term describes one complete revolution of the AC alternator
A)Circuit
B)Core
C)Coil
D) cycle
```
D) cycle
26
```
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
```
B)Electrical current is generated
27
```
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)Small and light weight
28
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
C)Hire initial cost than transformers or rectifiers
