A. hardening surface of workpiece to ob-tain hard and wear resistant surface
B. heating and cooling rapidly
C. increasing hardness throughout
D. inducing hardness by continuous process
E. hardening core
Related Mcqs:
- Which is false statement about case hardening. Case hardening is done by_______________?
A. electroplating
B. cyaniding
C. induction hardening
D. nitriding
E. flame hardening - Age-hardening is related with______________?
A. stainless steel
B. gun metal
C. german silver
D. duralumin
E. cast iron - In nodular iron, graphite is in the form of_____________________?
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite - Critical path moves along the activities having total float of_____________________?
A. positive value
B. negative value
C. zero value
D. same value
E. none of the above - Process of austempering results in__________________?
A. formation of bainite structure
B. carburised structure
C. martenistic structure
D. lamellar layers of carbide distributed throughout the structure
E. relieving of stresses throughout a component - Materials after cold working are subjected to following process to relieve stresses__________________?
A. hot working
B. tempering
C. normalising
D. annealing
E. special heat treatment - Cyaniding is the process of________________?
A. dipping steel in cyanide bath
B. reacting steel surface with cyanide salts
C. adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
D. obtaining cyanide salts
E. making corrosion resistant steel - Carbonation of coal is the process of________________________?
A. pulverising coal in inert atmosphere
B. heating wood in a limited supply of air at temperatures below 300°C
C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D. binding the pulverised coal into brick-ettes
E. enriching carbon in the coal - On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?
A. horizontal straight line
B. vertical straight line
C. straight inclined line
D. curved line
E. none of the above - Adiabatic process is________________?
A. essentially an isentropic process
B. non-heat transfer process
C. reversible process
D. constant temperature process
E. constant enthalpy process
