The fastest cooling rate is achieved when steel is quenched in
A.Brine
B.Air
C.Oil
D.Water
Category: Metallurgy Mcqs
If the structure of a sample consists of pearlite, cementite and free carbon, the sample may be
A.Cast iron
B.Alloy steel
C.Dead mild steel
D.Eutectoid steel
E.None of the above
Which of the following furnace is used for steel only?
A.Cupola
B.Air furnace
C.Open hearth furnace
D.Indirect arc furnace
Which allotropic form of iron does not have body centred cubic lattice?
A.Alpha iron
B.Beta iron
C.Gamma iron
D.Delta iron
E.All of the above
Stellite contains
A.Cobalt, chromium and tungsten
B.Cobalt, vanadium and nickel
C.Nickel, copper and zinc
D.Nickel, zinc and aluminium
E.Copper, tin and lead
Dilute nitric acid applied to a clean fracture of wrought iron gives
A.White stain
B.Greenish stain
C.Blue stain
D.Grey stain
E.Black stain
A hardness value of 1400 BHN can be expected in case of
A.Cementite
B.Ferrite
C.Pearlite
D.All of the above
E.None of the above
Which of the following element does not impart hardness to steel?
A.Copper
B.Nickel
C.Silicon
D.Chromium
E.None of the above
The depth of hardening is affected by
A.Size of specimen
B.Hardenability of steel
C.Quenching medium
D.All of the above
If an article develops insufficient hardening after quenching, the defect can be corrected by
A.removing scale from surface
B.normalising or annealing followed by hardening
C.reheating the article in oxidizing atmosphere and quenching
D.Any of the above
