A. Local hardening
B. Scale formation
C. Segregation
D. Warpage
✅ The correct answer is option D.
Engineering MCQs
Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?
A. Quartz
B. Flourspar
C. Dolomite
D. Manganese ore
✅ The correct answer is option B.
Pick the odd man out of the following.
A. Calorising
B. Pack carburising
C. Nitriding
D. Cyaniding
✅ The correct answer is option A.
Annealing of cast iron
A. Softens it to facilitate machining
B. Decreases the free carbon
C. Increases the strength
D. None of these
✅ The correct answer is option A.
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is
A. Reduced preferentially
B. Cheaper
C. Oxidised preferentially
D. Lighter
✅ The correct answer is option C.
Case hardening is not done by
A. Nitriding
B. Hot dipping
C. Electroplating
D. Both B & C
✅ The correct answer is option D.
Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as
A. Gr0.25, Gr
B. Gr0.25, Gr0.33
C. Gr, Gr0.25
D. Gr0.33, Gr0.25
✅ The correct answer is option A.
Lead is poured into the joint between two- __________ pipes.
A. Mild steel
B. Concrete
C. Cast iron
D. Asbestos cement
✅ The correct answer is option C.
Cast iron has the unique property of high
A. Ductility
B. Damping characteristics
C. Hardness
D. Malleability
✅ The correct answer is option B.
Alloys having more than 80% copper are generally more
A. Abrasion resistant
B. Corrosion resistant
C. Prone to season cracking
D. Machinable
✅ The correct answer is option B.