engineering materials MCQs – Page 10

Practise focused engineering materials questions with marked answers for exam preparation and subject revision.

engineering materials Mcqs
181. Addition of copper to aluminium results in_____________________?
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A. improvement of casting characteristics

B. one of the best known age and precipitation-hardening systems

C. none of the above

D. improving machinability

E. improvement of corrosion resistance

182. Recrystallization temperature is one________________?
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A. at which crystals first start forming from molten metal when it is cooled

B. at which change of allotropic form takes place

C. at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

D. at which crystals are destroyed on heating

E. at which crystals grow bigger in size

183. In which of the following cases, consideration of creep is important_________________?
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A. flywheel of steam engine

B. gas turbine blades

C. cast iron pipes

D. piston I.C. engine

E. cycle chains

184. Admiralty gun metal contains__________________?
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A. alloy of tin, lead and cadmium

B. 63 to 67% nickel and 30% copper

C. none of the above

D. 88% copper, 10% tin and rest zinc

E. iron scrap and zinc

185. German silver is an alloy of___________________?
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A. silver and gold

B. nickel, copper and zinc

C. nickel and copper

D. refined silver

E. silver and some impurities

186. Hardness of steel depends on_________________?
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A. the quality of ore from which it is made

B. contents of alloying elements

C. method of fabrication

D. amount of carbon it contains

E. the shape and distribution of the car-bides in iron
187. Balls for ball bearings are made of_________________?
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A. stainless steel

B. carbon-chrome steel

C. high carbon steel

D. mild steel

E. cast iron

188. Bell metal contains_____________________?
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A. 85-92% copper and rest tin with little lead and nickel

B. 70-75% copper and rest tin

C. 70% copper and 30% zinc

D. 70-75% copper and rest zinc and tin

E. 90% copper and 10% tin

189. Solder is an alloy consisting of________________?
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A. lead and copper

B. tin and copper

C. tin and lead

D. tin, antimony, copper

E. lead and zinc

190. Maximum percentage of carbon in austenite is______________?
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A. 1.7%.

B. 1.25%

C. 0.80%

D. 0.26%

E. 0.03%

191. Aluminium bronze contains aluminium and copper in the ratio of___________________?
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A. 50:50:00

B. 60:40:00

C. 90:10:00

D. 40 : 60

E. 10 : 90