A. Work
B. Age
C. Induction
D. Flame
Related Mcqs:
- In cold working of metal as compared to its hot working____________________?
A. Cracks and blow holes are eliminated
B. Ductility and impact strength improves
C. Appreciable strain hardening is produced
D. Yield stress, hardness and fatigue strength is not at all affected - A hardness depth of about 3 mm can be achieved by induction hardness in ______________ seconds?
A. 5
B. 100
C. 250
D. 500 - _____________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working?
A. Solid solution hardening
B. Screw dislocation
C. Strain ageing
D. Twinning - ‘Age hardening’ of duralumin is due to____________________?
A. Copper
B. Magnesium
C. Both A. & B.
D. Neither A. nor B. - Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is _____________ percent?
A. 0.02
B. 0.2
C. 0.35
D. 0.5 - Age hardening is concerned with_________________?
A. Copper
B. Brass
C. Duralumin
D. Silver - Work hardening of a material ________________?
A. Decreases its tensile strength
B. Decreases its ductility
C. Increases its ductility
D. Does not affect its ductility - ______________ is not a case hardening process?
A. Carburising
B. Nitriding
C. Cyaniding
D. Annealing - Hardening of steel is not possible unless it is heated ______________ critical point?
A. Above the highest
B. Above the lowest
C. Between the first & second
D. Between the second & third - The formation of oxide film on a metal due to atmospheric exposure reduces its____________?
A. Toughness
B. Stiffness
C. Creep limit
D. All A., B. & C.
