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.Management Sciences
Category: Metallurgy
Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?
A. High quality iron
B. Chrome
C. Cobalt
D. Nickel
Nickel is added to wrought gold alloys as______________?
A. Strengtherner
B. Hardener
C. Whitens the alloy
D. Scavenger
Back pressure porosity can be avoided by________________?
A. Using asbestos linear
B. Placing the sprue at least one quarter inch away form the end of casting ring
C. Preventing rapid heating the investment in burnout oven
D. Using a short and wide sprue
Cleaning of base metal alloy is done by______________?
A. Warm HCI
B. Cold HF
C. Cold H2SO4
D. Sand blasting with aluminium oxide
Pickling________________?
A. Is accomplished by soaking the casting in baking soda
B. Causes porosity in gold
C. Removes surface oxides from gold castings
D. Remove investment from gold casting
Nickel-Titanium alloy has__________________?
A. Unreliable spring back
B. low spring back
C. Minimal spring back
D. None of the above
Dendrites in cst alloys form by mechanism of_________________?
A. Constitutional superconductivity
B. Constitutional supercooling
C. Constitutional supergriting
D. Constitutional supergraining
Quartz in investment material is added for_______________?
A. Strength
B. Expansion components for casting shrinkage
C. Decrease strength
D. Contraction
Which of the following fuel gases used for soldering, has the highest heat content______________?
A. Hydrogen
B. Natural gas
C. Acetylene
D. Propane
Stages of annealing in order_________________?
A. Recovery recrystallization grain growth
B. Recrystallization recovery, grain growth
C. Grain Growth Recrystallization recovery
D. Melting point, grain growth, Recrystallization
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