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1.
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In arc welding, electrical energy is changed to heat energy.
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2.
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Unlike charges attract and like charges repel.
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3.
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The movement of protons throughout the length of a conductor constitutes an electrical current.
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4.
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If the electromotive force is sufficient, voltage will move through a conductor.
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5.
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The reluctance of atoms to give up their electrons is known as
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6.
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In the equation I = E ÷ R, the letter "E" represents
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7.
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How much voltage is needed to pass 150 amps through a resistor of .14 ohms?
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8.
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A welding operator strikes an arc and adjusts his machine to 27 volts and draws 280 amps. How much power in terms of watts does he use?
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9.
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During one AC cycle, current is at its maximum negative at what degree of rotation?
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10.
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As long as power supplied to a transformer circuit is held steady, the secondary current will decrease as the primary voltage ____________.
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11.
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Alternating current is changed to direct current through the use of a ____________.
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12.
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In a constant current welding power source, the welding current remains relatively constant despite considerable changes in ___________________________.
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13.
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The term "drooper" is often used to describe what type of machine?
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14.
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A metal which has a high iron content is known as a ___________ metal.
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15.
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The two types of slag used in steel refining are acid and _________________.
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16.
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Steel is an alloy of carbon and iron.
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17.
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Steel, which has a total alloy content of 10% or more, is known as a low alloy steel.
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18.
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A type 4340 steel has approximately 40% carbon content.
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19.
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A change in temperature sufficient to alter the crystalline structure of a metal is known as ___________________.
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20.
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When crystals form, they meet at their ________________.
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21.
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The point at which a metal reaches the limit of its elastic characteristic determines its ____________________.
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22.
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___________________ is one of the most effective alloying elements for increasing the hardness and strength of steel.
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23.
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The notch toughness of steel is greatly improved with the addition of
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24.
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Efforts are made to eliminate ___________________ from steel because it can cause brittleness.
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25.
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The properties of metals are determined by their microstructure.
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