Metal Working Quiz

The cold working of metal is accomplished at

• below re-crystallization temperature

• above re-crystallization temperature

• re-crystallization temperature

• any of the above

Which of the following is not improved by cold working of metals?

• hardness

• toughness

• surface finish

• corrosion resistance

Which of the following operation can be performed on lathe?

• spinning

• drawing

• coining

• swaging

• spinning

• drawing

• embossing

• bending

• Yield point

• Proportional limit

• Fatigue strength

• Ultimate strength

• Pre-crystallization

• Re-crystallization

• Crystallization

• Post-crystallization

• slip point

• slip line

• slip plane

• any of the above

• below recrystallization temperature

• above recrystallization temperature

• recrystallization temperature

• any of the above

Which statement best describes the result of slow cooling of metals from red heat?

• Larger grains which generally results in a softer and weaker metal.

• Larger grains which generally results in a harder and stronger metal.

• Smaller and more numerous grains producing a harder and often a stronger metal.

• Smaller and more numerous grains producing a harder and weaker metal.

Which statement best describes work hardening of metals?

• Heating the metal until it is red hot and then quenching in water.

• The 'tangling' of dislocations at grain boundaries, foreign atoms and other dislocations due to working such as hammering, rolling, bending and abrading.

• Dislocations moving from one side of the metal to the other thereby distorting the metal.

• Heating the metal until red hot and then cooling slowly in air.