316. Beryllium is used chiefly as an alloy addition to copper to produce
A.Precipitation-hardenable alloy
B.Corrosion resistant alloy
C.High-strength alloy
D.Non-magnetic and non-sparking alloy
317. Which of the following has maximum hardness
A.Austenite
B.Pearlite
C.Troostite
D.Martensite
318. Which of the following is not the objective of normalising
A.Refine steel structure
B.Remove strains caused by cold working of metal
C.Remove internal stresses
D.Improve tensile strength
319. The main purpose of heat treatment of steels is to change the
A.Chemical composition
B.Mechanical properties
C.Corrosion properties
D.Surface finish
320. Low carbon steel can be hardened by
A.Hardening
B.Heating and quenching in oil
C.Heating and quenching in water
D.Carburising and cyaniding
321. The hardening strains are reduced and the toughness of the part increased by the following process after hardening
A.Annealing
B.Carburizing
C.Tempering
D.Anodizing
322. Hard alloy and tool steels are made easy machinable by following heat treatment
A.Case carburising
B.Tempering
C.Annealing
D.Normalising
Page 46 of 54