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

Question 1

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

Answer 1

C

Question 2

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

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

Answer 2

A

Question 3

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

Answer 3

D

Question 4

The unit of measure of electrical flow is ____________.

A) volts
B) amps
C) watts

Question 5

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 6

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 7

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

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

Question 8

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 9

____ controls the size of the arc.

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

Question 10

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 11

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 12

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 13

In alternators the welding current is produced on the ____.

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

Question 14

Resistance to the flow of electrons produces ____.

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

Question 15

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

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

Question 16

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 17

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

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

Question 18

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 19

The unit of measure of electrical pressure is ______________.

A) volts
B) amps
C) watts

Question 20

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 21

An advantage to ____________________ is higher current setting and longer times, which are helpful with E7018 electrodes.

Question 22

Portable welders often have _____ or ______ plug outlets.

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

Question 23

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

Question 24

Why is it important to keep portable welders properly tuned?

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

Question 25

The unit of measure of electrical power is ____________.

A) volts
B) amps
C) watts

Question 26

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

Question 27

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

Question 28

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

Question 29

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

Question 30

____________________ is a measure of electric pressure.

Question 31

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

Question 32

An electric current is the flow of ____________________.

Question 33

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 34

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

Question 35

What is the name for the process used to increase the current if the arc gets too short?

A) Dig
B) Arc Force Control
C) Arc Force
D) All of the above

Question 36

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

Question 37

The terms welding cables and ____________________ mean the same thing.

Question 38

Temperature is the measurement of ________ energy in a material.

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

Question 39

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

Question 40

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