During hardening soft spots can be avoided by
A.using a more effective cooling medium
B.protecting against decarburization in heating
C.obtaining a more homogeneous structure employing annealing or normalising before hardening
D.Any of the above
Category: Metallurgy Mcqs
The maximum temperature inside a blast furnace gas is of the order of
A.50?C
B.1000?C
C.1600?C
D.2600?C
E.3600?C
Which of the following is the hardest?
A.Talc
B.Fluorite
C.Quartz
D.topaz
E.Corundum
An operation on steel aimed at softening the steel to improve machinability is known as
A.Softening
B.Cold working
C.Shot blasting
D.Annealing
E.Temperature
Dilute nitric acid applied to a clean fracture of white cast iron will produce
A.White stain
B.Grey stain
C.Black stain
D.Brown stain
E.Pink stain
Babbit metal is an alloy of
A.Tin, antimony and copper
B.Tin, antimony and lead
C.Tin, copper and lead
D.Tin, zinc and copper
E.Lead, zinc and copper
Bronze is an alloy
A.Copper, lead and tin
B.Copper, zinc and tin
C.Copper, zinc and tin
D.Zinc, nickel and tin
E.Nickel, aluminium and copper
Which of the following furnaces is not used for non-ferrous materials
A.Pit furnace
B.Crucible furnace
C.Cupola
D.Oil fired tilting furnace
E.Gas fired tilting furnace
Lowest melting point may be expected for
A.Aluminium
B.Brass
C.Copper
D.Lead
E.Zirconium
Slow plastic deformation of metals under a constant stress is known as
A.Fatigue
B.Proof deformation
C.Gradual deformation
D.Creep
E.Endurance failure
