?When mild steel is cut, it forms a light gray colored oxide which primarily consists of ____.

A. ?Fe2O3
B. ?Fe3O4
C. ?Fe2O6
D. ?Fe4O8


Answer: B

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Tapered roller bearings must be adjusted to get the correct end play or preload. This is usually achieved by using ________.

A) Selective thickness shims B) Various sizes of races C) Different tapers used for the bearings D) Different size rollers

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?Technician A says that steam cleaning and pressure washing are common methods of cleaning internal engine parts. Technician B says that steam cleaning is safe to use with electrical components. Who is right?

A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B

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After communication is "encoded," it is sent through a(n):

a. aperture b. channel c. tube d. tunnel

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The material with the least resistance is

A) silver B) copper C) aluminum D) tin

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