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.Management Sciences
Category: Materials and Construction
Lead pipes are not safe for carrying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by___________________?
A. Dilute HCl
B. Acetic acid
C. Concentrated H2SO4
D. None of these
Which of the following is not used as the ceramic material in „cermets‟?
A. Silicides
B. Oxides
C. Carbides
D. Nitrides
A material no longer behaves elastically beyond_________________?
A. Plastic limit
B. Limiting load
C. Elastic limit
D. Breaking load
Gun metal is an alloy of_________________________?
A. Nickel, tin and copper
B. Copper, tin and zinc
C. Copper, phosphorus and nickel
D. Manganese, phosphorus and nickel
Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the__________________?
A. Ultimate tensile strength (U.T.S.)
B. Endurance limit
C. Elastic limit
D. None of these
Concentrated HCl at 30°C can be stored in a vessel made of ________________________?
A. PTFE and porcelain
B. Cast iron and aluminium
C. Stainless steel and high silicon cast iron
D. None of these
Addition of _____________ in steel can help in increasing the depth of hardness?
A. Nickel
B. Chromium
C. Vanadium
D. Tungsten
In cold working of metal as compared to its hot working____________________?
A. Cracks and blow holes are eliminated
B. Ductility and impact strength improves
C. Appreciable strain hardening is produced
D. Yield stress, hardness and fatigue strength is not at all affected
Tin coating on metals is not done by_____________________?
A. Spraying
B. Powder metallurgy
C. Hot dipping
D. Electro-deposition
High degree of toughness is a must for__________________?
A. High speed steel
B. Shock resisting steel
C. Cold work tool steel
D. None of these
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