MEng 154 lecture 7

Material having a high electrical resistance and should not be used as conductor of electrical current.

• magnesium

• copper

• nickel

• iron

Steel is heated to a temperature above the critical range, after which it is cooled in still air to produce a generally fine pearlite structure. The purpose is to promote uniformity of structure and properties after a hot-working operation such as forging or extrusion. What was the heat treatment involved?

• Annealing 

• Stress relieving

• Tempering 

• Normalizing

Identify:

• coil spring

• leaf spring

• helical spring

• lip spring

It is a process that produces residual compressive stress on the machine part, which uses a series of hammer blows on the surface.

Weld spatter refers to:

• welding electrode

• filler material

• shield

• welding defect

Water should be run at a speed of

• 70-90 m/min

• 40-120 m/min

• 300 m/min

• 90-180 m/min

Galvanized steel plate is a plate coated with:

It has been said that 80% of the failures of machine parts have been:

• negligence

• compression

• torsion

• fatigue failures

In laminated springs, the strips are provided in different lengths for:

• economy

• reduction in weight

• improved appearance

• equal distribution of stress

Occurs when the oil film fails, but in this case, the load and speed are so high that the surface metal is melted and the metal is smeared down the profile.

• abrasion

• corrosion

• spalling

• scoring