Mechanical Engineering Board Exam Questions Part 4

Source: Machinery's Handbook
Topic: Materials and Processes




1.______is a number indicating how many times a certain volume of a material is heavier than an equal volume of water
a.specific ratio
b.density
c.Specific gravity
d.Avogadro's Number

2._______an instrument for determining the density of liquids, provided with graduations made to an arbitrary scale
a.hygrometer
b.hydrometer
c.weighing scale
d.sphygmomanometer

3. Stainless steels generally contain at least _______ chromium, with or without other elements
a.40%
b.30%
c.20%
d.10%

4.______ is type of stainless steel that is nonmagnetic in the annealed condition, although some may become slightly magnetic after cold working
a.austenitic
b.hematite
c.martensitic
d.ferritic

5. ______ grades of stainless steel are always magnetic and contain chromium but no nickel.
a.austenitic
b.hematite
c.martensitic
d.ferritic




6. _______ grades of stainless steel are magnetic and can be hardened by quenching and tempering.
a.austenitic
b.hematite
c.martensitic
d.ferritic

7.The 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.
a. Stress Relieving
b. Spheroidize Annealing
c. Annealing
d. Normalizing

8. This process reduces internal stresses, caused by machining, cold working, or welding, by heating the steel to a temperature below the critical range and holding it there long enough to equalize the temperature throughout the piece.
a. Stress Relieving
b. Spheroidize Annealing
c. Annealing
d. Normalizing

9. This is a special form of annealing that requires prolonged heating at an appropriate temperature followed by slow cooling in order to produce globular carbides, a structure desirable for machining, cold forming, or cold drawing, or for the effect it will have on subsequent heat treatment.
a. Stress Relieving
b. Spheroidize Annealing
c. Annealing
d. Normalizing

10. The steel is heated to a temperature above or within the critical range, then cooled at a predetermined slow rate (usually in a furnace) to produce a coarse pearlite structure. This treatment is used to soften the steel for improved machinability; to improve or restore ductility for subsequent forming operations; or to eliminate the residual stresses and microstructural effects of cold working.
a. Stress Relieving
b. Spheroidize Annealing
c. Annealing
d. Normalizing