Major constituent of phosphor bronze is
A.Zinc
B.Copper
C.Lead
D.Aluminium
E.Phosphorous
Category: Metallurgy Mcqs
Cracks of a vertical nature and dark coloured fissures in a sample of hardened steel indicate that
A.Steel has been properly hardened
B.Steel has not been properly heated
C.Steel has been burned
D.Steel has achieved maximum possible hardness in accordance with the carbon percentage
E.Steel contains excessive alloying elements
If a sample of steel shown excessive hardness after tempering the probable cause could be
A.Insufficient holding time during tempering
B.Excessive proportion of alloying elements
C.High temperature during tempering
D.Change in volume during cooling
E.None of the above
The nature of atomic bond found in diamond is
A.Ionic
B.Covalent
C.Metallic
D.Either of above
E.None of the above
For each ton of pig iron produced in blast furnace, the quantity of coke required would be roughly
A.0.1 ton
B.0.25 ton
C.0.5 ton
D.1.4 ton
E.1.9 ton
Which iron ore has least percentage of iron
A.Magnetite
B.Hematite
C.Limonite
D.Siderite
E.All have almost equal percentage of iron ore
High carbon steels intended to be quenched in water should have manganese percentage less than
A.2 percent
B.1.5 percent
C.1 percent
D.0.5 percent
E.No manganese percent
Which of the following gives granular fracture?
A.Steel
B.Wrought iron
C.Cast iron
D.All of the above
E.None of the above
If a sample of steel shows unsymmetrical deformation of a piece in quenching, the probable cause could be
A.Excessive proportion of alloying elements
B.Non-uniform heating or cooling
C.Impure quenching oil
D.Low temperature during heating
E.Low specific heat of quenching oil
During heat treatment the formation of thick layer of scale on the surface of steel articles is mainly due to
A.excessive hardness
B.oxidation
C.reduction
D.coarse grain structure
