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MCQs 1: Foundry crucible is made of_________________?

mild steel german silver lead cast iron graphite
Answer Explanation

MCQs 2: Aluminium bronze contains__________________?

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg 10% aluminium and 90% copper 90% magnesium and 9% aluminium with some copper 10% aluminium and 90% tin
Answer Explanation

MCQs 3: The correct composition of Babbit metal is__________________?

87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg 87% Sn, 4% Cu, 8% Sb, 1% Al 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg none of the above
Answer Explanation

MCQs 4: Neutral solution is one which has pH value__________________?

greater than 7 less than 7 equal to 7 pH value has nothing to do with neutral solution none of the above
Answer Explanation

MCQs 5: Basic solution is one which has pH value___________________?

greater than 7 equal to 7 less than 7 pH value has nothing to do with basic solution none of the above
Answer Explanation

MCQs 6: Recrystallisation temperature can belowered by_________________?

purification of metal grain refinement working at lower temperature all of the above none of the above
Answer Explanation

MCQs 7: Austenite rs a combination of_________________?

ferrite and cementite cementite and gamma iron ferrite and austenite ferrite and iron graphite pearlite and ferrite
Answer Explanation

MCQs 8: Lead is poured into the joint between two pipes. These pipes may be made of____________________?

cast iron vitrified clay asbestos cement concrete mild steel
Answer Explanation

MCQs 9: Pearlite is a combination of___________________?

ferrite and cementite cementite and gamma iron ferrite and austenite ferrite and iron graphite pearlite and ferrite
Answer Explanation

MCQs 10: The transistor is made of___________________?

silver gold copper germanium german silver
Answer Explanation

MCQs 11: Following elements have face-centred cubic structure__________________?

gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt Mg, Zn, Ti, Zr, Br, Cd a iron (below 910°C and between 1400 to 1539°C), W all of the above none of the above
Answer Explanation

MCQs 12: Acidic solution is one which has pH value__________________?

greater than 7 less than 7 equal to 7 pH value has nothing to do with neutral solution none of the above
Answer Explanation

MCQs 13: Babbit metal is a_________________?

lead base alloy tin base alloy copper base alloy all of the above A. and C. above
Answer Explanation

MCQs 14: Age-hardening is related with______________?

stainless steel gun metal german silver duralumin cast iron
Answer Explanation

MCQs 15: Dow metal contains____________________?

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg 90% aluminium and 90% copper 90% magnesium and 9% aluminium with some copper 90% magnesium and 10% tin
Answer Explanation

MCQs 16: German silver contains_________________?

1% silver 2.5% silver 5% silver 10% silver 100% silver
Answer Explanation

MCQs 17: Constantant an alloy used in thermocouples is an alloy of __________________?

copper and tin copper and zinc copper and iron copper and nickel copper and chromium
Answer Explanation

MCQs 18: Addition of lead and bismuth to aluminium results in_________________?

improvement of casting characteristics improvement of corrosion resistance one of the best known age and precipitation-hardening systems improving machinability none of the above
Answer Explanation

MCQs 19: Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element__________________?

iron copper aluminium zinc nickel
Answer Explanation

MCQs 20: Addition of copper to aluminium results in_____________________?

improvement of casting characteristics improvement of corrosion resistance one of the best known age and precipitation-hardening systems improving machinability none of the above
Answer Explanation

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