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.Management Sciences
Category: Engineering Materials
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
Taps, dies and drills contain carbon________________?
A. below 0.5%
B. below 1%
C. above 1%
D. above 2.2%
E. nil
In malleable iron, carbon is present in the form of___________________?
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite
Annealing of white cast iron results in production of_________________?
A. malleable iron
B. nodular iron
C. spheroidal iron
D. grey iron
E. none of the above
The unique property of cast iron is its high ___________________?
A. malleability
B. ductility
C. surface finish
D. damping characteristics
E. hardness
Cast iron is characterised by minimum of following %age of carbon_________________?
A. 0.2%
B. 0.8%
C. 1.3%
D. 2%
E. 6.3%.
Basic constituents of Monel metal are _________________?
A. nickel, copper
B. nickel, molybdenum
C. zinc, tin, lead
D. nickel, lead and tin
E. none of the above
Foundry crucible is made of_________________?
A. mild steel
B. german silver
C. lead
D. cast iron
E. graphite
Pick up the wrong statement?
A. aluminium in steel results in excessive grain growth
B. manganese in steel induces hardness
C. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility
D. tungsten in steels improves magnetic properties and hardenability
E. sulphur, phosphorous and lead im¬prove machining properties of steel
Admiralty gun metal contains__________________?
A. 63 to 67% nickel and 30% copper
B. 88% copper, 10% tin and rest zinc
C. alloy of tin, lead and cadmium
D. iron scrap and zinc
E. none of the above
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