A. Grain refinement
B. Increasing corrosion resistance
C. Reducing porosity
D. Improving fluidity
Related Mcqs:
- Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting) ?
A. V/A
B. V/A2
C. V2/A
D. V2/A2 - Titanium is produced by ___________________ of Ti Cl4 ?
A. Electrolytic reduction
B. Calcium reduction
C. Magnesium reduction
D. Thermal dissociation - Dephosphorization of molten pig iron is favoured by_______________________?
A. Oxidising and basic slag
B. Reducing and basic slag
C. High activity co-efficient of phosphorous in metal
D. Oxidising and neutral slag - Steel & cast iron pipes are produced by ______________ casting ?
A. Slush
B. Die
C. Investment
D. True centrifugal - Normalising of a casting does not__________________?
A. Induce stresses in it
B. Refine its grain structure
C. Reduce segregation
D. Improve its mechanical properties - The most suitable material for die casting is __________________?
A. Iron
B. Copper
C. Steel
D. Nickel - Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?
A. Cobalt, chromium & tungsten
B. Cobalt, chromium & nickel
C. Molybdenum, tungsten & chromium
D. Cobalt, zirconium & molybdenum - Machinability of hard alloys and tool steels is improved by_____________________?
A. Spheroidising
B. Annealing
C. Tempering
D. Normalising - Non-ferrous alloys used for making cutting tools need not have high__________________?
A. Abrasion resistance
B. Toughness
C. Red hardness
D. Cutting speed - While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to ______________ × Tm (where, Tm Melting temperature) ?
A. 0.25
B. 0.45
C. 0.70
D. 0.95
