Deck 3: Shielded Metal Arc Equipment, Setup, and Operation

Question 1

In generators the welding current is produced on the ____.

A) brushes
B) diode
C) armature
D) stator

Answer 1

C

Question 2

____ controls the size of the arc.

A) Voltage
B) Amperage
C) Heat
D) Wattage

Answer 2

B

Question 3

Resistance to the flow of electrons produces ____.

A) electricity
B) voltage
C) light
D) heat

Answer 3

D

Question 4

The amount of heat produced by a welding arc is determined by the ____.

A) amperage
B) wattage
C) voltage
D) capacitance

Question 5

The shielded metal arc welding machine's voltage output ____ as its current ____.

A) decreases, decreases
B) increases, increases
C) increases, decreases
D) decreases, increases

Question 6

____ is a measurement of the amount of electrical energy or power in the arc.

A) Voltage
B) Amperage
C) Heat
D) Wattage

Question 7

____ machines are adjusted by turning a handwheel that moves the internal parts closer together or farther apart.

A) Movable coil
B) Tap type
C) Inverter
D) Transformer

Question 8

The ____ machine allows the selection of different current settings by tapping into the secondary coil at a different turn value.

A) inverter
B) transformer
C) multiple-coil
D) movable-coil

Question 9

____ can cause an arc to move during a weld.

A) Alternating current
B) Air currents
C) Uneven flux lines
D) Imperfections in the welding material

Question 10

The heat produced by a rectifier ____.

A) leads to a higher amperage in DC than AC
B) reduces the power efficiency of the welding machine
C) increases the power efficiency of the welding machine
D) can be recycled in a heat sink to provide power to other machines

Question 11

The temperature of a welding arc is dependent on the ____, arc length, and atmosphere.

A) wattage
B) capacitance
C) amperage
D) voltage

Question 12

A transformer with more turns of wire in the primary winding than in the secondary winding is known as a ____.

A) welding transformer
B) low-amperage transformer
C) step-down transformer
D) high-voltage transformer

Question 13

Which of the following is true of shielded metal arc welding?

A) The machine and the electrodes are expensive.
B) Metal as thin as 1/16 inch to several feet thick can be welded using the same machine.
C) There is a lot of equipment required, and it is difficult to move.
D) The process is not suitable for cast iron, aluminum, stainless steel or nickel.

Question 14

____ controls the maximum gap the electrons can jump to form the arc.

A) Voltage
B) Amperage
C) Heat
D) Wattage

Question 15

Electrons flow through a conductor ____.

A) from negative to positive
B) from positive to negative
C) from negative to negative
D) from positive to positive

Question 16

A(n) ____ produces AC, and a(n) ____ produces DC.

A) alternator, generator
B) generator, alternator
C) diode, alternator
D) generator, diode

Question 17

In alternators the welding current is produced on the ____.

A) brushes
B) diode
C) armature
D) stator

Question 18

In a standard welding transformer, the size of the iron core is determined by ____.

A) the distance between the coils
B) the length of time it takes for the magnetic field to build up and collapse
C) the desired thickness of the weld bead
D) the speed of the rotor

Question 19

The major classifications of welding machines are ____.

A) multiple core, inversion, transformer
B) multiple inversion, transformer core, and step-down
C) multiple coil, movable coil, movable core, and inverter
D) magnetic core, movable coil, and transformer

Question 20

Open circuit voltage ____.

A) is the voltage at the arc during welding
B) is the voltage at the electrode before striking an arc
C) varies with arc length, type of electrode, type of current, and polarity
D) is usually between 10 V and 45 V

Question 21

An electric current is the flow of ____________________.

Question 22

​The unit of measure of electrical pressure is ______________.

A) ​Volts
B) ​Amps
C) ​Watts

Question 23

____________________ is a measure of electric pressure.

Question 24

____________________ is the measurement of the total number of electrons flowing.

Question 25

​The quantity of heat in a material is a function of both ________ and ________.

A) ​temperature; mass
B) ​amps; watts
C) ​welding speed; length
D) ​material type; size

Question 26

​Why is it important to keep portable welders properly tuned?

A) ​Reduce air pollution
B) ​So they run quieter
C) ​To produce smoother welding current
D) ​All of the above

Question 27

____________________ is the measurement of the amount of electrical energy or power in the arc.

Question 28

A 60% duty cycle means that the machine can be used a total of ____ minutes out of every ten minutes at the maximum rated current.

A) two
B) six
C) eight
D) ten

Question 29

Welding cables made of aluminum wire must be ____ would be required for copper.

A) one size smaller than
B) the same size as
C) one size larger than
D) two sizes larger than

Question 30

​Inverter welders may have transformers as light as ____________.

A) ​35 lb (16 kg)
B) ​2.2 lb (1 kg)
C) ​17 lb (7.7 kg)
D) ​7 lb (3 kg)

Question 31

​The temperature of an arc can range between 5500°F (3000°C) to above 36,000°F (20,000°C) but most SMAW temperatures are around __________.

A) ​4500°F (2500°C)
B) ​3200°F (18000°C)
C) ​1100°F (6100°C)
D) ​6000°F (3300°C)

Question 32

​Temperature is the measurement of ________ energy in a material.

A) ​voltage
B) ​mechanical
C) ​electrical
D) ​thermal

Question 33

A work clamp ____.

A) may have power losses that should be ignored
B) reduces welding efficiency
C) must not clamp too tightly to the material
D) should be carefully touched occasionally to determine if it is hot

Question 34

​The air that circulates through a welding machine should be free of _______​

A) ​dust.
B) ​oil.
C) ​metal filings.
D) ​All of the above

Question 35

​The unit of measure of electrical flow is ____________.

A) ​Volts
B) ​Amps
C) ​Watts

Question 36

Welding cables should ____.

A) be wrapped around the body to distribute the weight
B) be sufficiently long to reach the work station
C) never be installed overhead
D) be placed on the floor in aisles and walkways

Question 37

​SMAW is a widely used welding process because of its ___________________.

A) ​low cost
B) ​flexibility
C) ​portability
D) ​All of the above

Question 38

The positive side of an electrode arc is called a(n) ____________________.

Question 39

​The unit of measure of electrical power is ____________.

A) ​Volts
B) ​Amps
C) ​Watts

Question 40

​Portable welders often have _____ or ______ plug outlets.

A) ​110-volt or 220-volt
B) ​110-volt or 120-volt
C) ​12-volt DC or 24-volt DC
D) ​12-volt AC or 24-volt AC

Question 41

Give an overview of the process of shielded metal arc welding.

Question 42

Explain how a welding transformer works.

Question 43

The negative side of an electrode arc is called a(n) ____________________.

Question 44

The ______________________________ is the percentage of time a welding machine can be used continuously.

Question 45

The terms welding cables and ____________________ mean the same thing.

Question 46

Explain how generators and alternators work, and the similarities and differences between them.

Question 47

Explain what magnetic flux lines are and how they may cause a wire to move when welding with very high amperages.

Question 48

Explain how an alternating welding current can be converted to a direct current.

Question 49

A(n) ____________________ allows a current to flow in one direction only.

Question 50

In a(n) ____________________ welding machine the incoming power is changed from 60 cycles per second to several thousand cycles per second.