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​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)

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

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

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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

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

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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

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

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


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

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

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____ 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

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

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An electric current is the flow of ____________________.

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

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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)

Correct Answer

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