A. improves wear resistance, cutting ability and toughness
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties
C. improves cutting ability and reduces hardenability
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. none of the above
Related Mcqs:
- Pick up the wrong statement Nickel and chromium in steel help in _________________?
A. providing corrosion resistance
B. improving machining properties
C. providing high strength at elevated temperatures
D. raising the elastic limit
E. improving the resilience and ductility - Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?
A. 50 : 20 : 20 : 10
B. 40 : 30 : 20 : 10
C. 50 : 20 : 10 : 20
D. 30 : 20 : 30 : 20
E. 50 : 10 : 20 : 20 - In grey cast iron, carbon is present in the form of____________________?
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite - Steel contains____________________?
A. 80% or more iron
B. 50% or more iron
C. alloying elements like chromium, tungsten nickel and copper
D. elements like phosphorus, sulphur and silicon in varying quantities
E. high quantities of sulphur - Which is false statement about annealing. Annealing is done to________________?
A. relieve stresses
B. harden steel slightly
C. improve machining characteristic
D. soften material
E. permit further cold working - ‘Killed steels’ are those steels__________________?
A. which are destroyed by burning
B. which after their destruction are recycled to produce fresh steel
C. which are deoxidised in the ladle with silicon and aluminium
D. in which carbon is completely burnt
E. which have poor properties due to improper manufacturing - The molecules in a solid move______________?
A. in a random manner
B. in a haphazard way
C. in circular motion
D. back and forth like tiny pendulums
E. do not move - Tensile strength of steel can be safely in-creased by________________?
A. adding carbon up to 2.8%
B. adding carbon up to 6.3%
C. adding carbon up to 0.83%
D. adding small quantities of copper
E. adding copper and carbon - The composition of silver solder is ___________________?
A. silver, copper, zinc
B. silver, tin, nickel
C. silver, lead, zinc
D. silver, copper, aluminium
E. silver, lead, tin - Recrystallisation temperature can belowered by_________________?
A. purification of metal
B. grain refinement
C. working at lower temperature
D. all of the above
E. none of the above
