The tensile strength of nodular iron may be of the order of
A.100 kg/cm2
B.500 kg/cm2
C.1000 kg/cm2
D.2000 kg/cm2
E.4000 kg/cm2
Category: Metallurgy Mcqs
In which of the following cases creep is an important consideration?
A.Cast iron water pipes
B.Cycle chains
C.Gas turbine blades
D.Steam engine flywheel
E.All of the above
If an article develops insufficient hardening after quenching it could be due to any of the following EXCEPT:
A.Internal stresses in the article before heating
B.Hardening temperature too low
C.Cooling rate too slow
D.Holding insufficient at the hardening temperature
Crucible for melting of metals are made of
A.Cast iron
B.Chromium
C.Hard metal
D.Graphite
E.Tungsten
In Brinell hardness tester the load for aluminium is
A.300 kg
B.1500 kg
C.1000 kg
D.500 kg
E.100 kg
During first charge in cupola the time taken by material to melt is approximately
A.10 minutes
B.Half an hour
C.1 hour
D.2
E.5 to 6 hours
Modulus of elasticity for steel is approximately
A.1.2 x 106 kg/cm2
B.2 x 106 kg/cm2
C.12 x 106 kg/cm2
D.52 x 106 kg/cm2
E.78 x 106 kg/cm2
The highest percentage of chrommium that can be added to steel is usually
A.12 percent
B.15 percent
C.18 percent
D.25 percent
E.50 percent
Railway rails are made of
A.Dead muld steel
B.Mild steel
C.Low carbon steel
D.Medium carbon steel
E.High carbon steel
For normalizing, steel is heated to
A.700?C
B.900?C
C.100?C below critical temperature
D.Critical temperature
E.30?C to 60?C above critical temperature
