Secondary hardening in steels arises out of the
A. precipitation of fine alloy carbides at high temperature
B. refinement of ferrite grain size by working
C. decomposition of retained austenite upon heat treatment
D. precipitation of complex inter-metallics upon heat treatment
Answer: Option C
A plastically deformed metal crystal at low temperature exhibits wavy slip line pattern due to
A. Dislocation pile-up
B. Large number of slip systems
C. Low stacking faultenergy
D. Dislocation climb
Which of the following microstructures of the eutectic is not observed in binary alloys?
A. Lamellar
B. Widmanstatten
C. Acicular
D. Nodular
Upon addition of sodium oxide to molten silicate slag, the viscosity of the slag
A. decreases because the oxygen ions supplied by the sodium oxide break the chain structure of the silicate slag
B. increases because the oxygen ion supplied by the sodium oxide further add to the oxygen network in the slag
C. remains unaffected because fundamentally one can not distinguish between the oxygen ions supplied by the sodium oxide and those already present in the slag
D. remains unaffected because the oxygen ions fill up the holes and vacancies present in the liquid slag
A. P-4, Q-3, R-2, S-1
B. P-1, Q-2, R-3, S-4
C. P-2, Q-4, R-1, S-3
D. P-2, Q-4, R-3, S-1
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