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

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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

E) B) and D)
F) C) and D)

Correct Answer

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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

E) None of the above
F) A) and B)

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____ controls the size of the arc.


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

E) B) and C)
F) A) and D)

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

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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

E) A) and B)
F) B) and D)

Correct Answer

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

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Alternating welding current can be converted to direct current by using a series of rectifiers. A rectifier allows current to flow in one direction only. If one rectifier is added, it would be difficult to weld. A series of rectifiers, known as a bridge rectifier, can modify the alternating current. Rectifiers become hot as they change AC to DC. They must be attached to a heat sink and cooled by having air blown over them. The heat produced by a rectifier reduces the power efficiency of the welding machine. At the same dial settings for AC and DC, the DC is at a lower amperage. The difference in amperage (power) is due to heat lost in the rectifiers. The loss in power makes operation with AC more efficient and less expensive compared to DC.

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

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Shielded metal arc welding (SMAW) is a w...

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

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When electrons flow they create lines of...

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

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Generators and alternators both produce ...

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In alternators the welding current is produced on the ____.


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

E) A) and D)
F) A) and C)

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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)

E) A) and B)
F) A) and C)

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

Correct Answer

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The unit of measure of electrical flow is ____________.


A) volts
B) amps
C) watts

D) All of the above
E) B) and C)

Correct Answer

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B

The unit of measure of electrical power is ____________.


A) volts
B) amps
C) watts

D) None of the above
E) All of the above

Correct Answer

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Temperature is the measurement of ________ energy in a material.


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

E) C) and D)
F) A) and B)

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The unit of measure of electrical pressure is ______________.


A) volts
B) amps
C) watts

D) None of the above
E) A) and B)

Correct Answer

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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

E) A) and B)
F) A) and C)

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

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


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

E) A) and B)
F) A) and C)

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D

Showing 1 - 20 of 40

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