engineering materials MCQs – Page 9

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

engineering materials Mcqs
161. Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?
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A. 15-22

B. 15-Oct

C. 5-7

D. 10-Jul

E. 5-Mar

162. The most effective inhibitor of grain growth, when added in small quantities is__________________?
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A. manganese

B. vanadium

C. cobalt

D. carbon

E. copper

163. Dow metal contains____________________?
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A. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

B. 90% magnesium and 10% tin

C. 90% magnesium and 9% aluminium with some copper

D. 90% aluminium and 90% copper

E. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

164. The number of electrons in 1 cm3 of metal would be of the order of_______________?
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A. 1052

B. 1010

C. TO16

D. 1022

E. 1040

165. High carbon steel carries carbon %age c_________________?
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A. 1.5 to 2.5%.

B. 0.6 to 0.8%

C. 0.1 to 0.3%

D. 0.8 to 1.5%

E. 0.3 to 0.6%

166. Killed steels are those steels__________________?
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A. which are deoxidised in the ladle with silicon and aluminium

B. which have poor properties due to improper manufacturing

C. which after their destruction are recycled to produce fresh steel

D. in which carbon is completely burnt

E. which are destroyed by burning

167. Phosphor bronze contains____________________?
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A. 1% phosphorous

B. none of the above

C. 0.5% of phosphorous

D. 2.5% phosphorous

E. 5% phosphorous

168. Brass (alloy of copper and zinc) is an example of__________________?
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A. all of the above

B. interstitial solid solution

C. intermetallic compounds

D. none of the above

E. substitutional solid solution
169. Which is the false statement about wrought iron. It has________________?
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A. uniform strength in all directions

B. high ductility

C. easily weldable characteristics

D. high resistance to rusting and corrosion

E. ability of hold protective coating

170. Which is false statement about case hardening. Case hardening is done by_______________?
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A. electroplating

B. cyaniding

C. flame hardening

D. nitriding

E. induction hardening

171. The composition of silver solder is ___________________?
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A. silver, copper, zinc

B. silver, copper, aluminium

C. silver, tin, nickel

D. silver, lead, zinc

E. silver, lead, tin

172. Which of the following is not the correct method of increasing fatigue limit __________________?
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A. shot peening

B. nitriding of surface

C. cold working

D. under-stressing

E. surface decarburisation
173. In compression, a prism of brittle material will break________________?
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A. in direction perpendicular to application of load

B. by crushing into thousands of pieces

C. by forming a bulge (l>) by shearing along oblique plane

D. none of the above

174. Cupola produces following material__________________?
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A. malleable iron

B. pig iron

C. wrought iron

D. cast iron

E. white iron

175. Cobalt in steel __________________?
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A. none of the above

B. improves cutting ability and reduce hardenability

C. improves wear resistance, cuttinability and toughness

D. gives ductility, toughness, tensile strength and anti corrosion property:

E. refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties

176. Ductility of a material can be defined as__________________?
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A. ability to undergo large permanent deformations in compression

B. ability to undergo large permanent deformations in tension

C. none of the above

D. all of the above

E. ability to recover its original form

177. Cemented carbide tools are not found to be suitable for cutting_______________?
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A. cast iron

B. aluminium

C. brass

D. non-ferrous alloys.

E. steel
178. Eutectoid steel contains following percentage of carbon_______________?
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A. 0.8%

B. 0.30%

C. 1.2%.

D. 0.02%

E. 0.63%

179. Sulphur in pig iron tends to make it___________________?
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A. soft

B. ductile

C. hard

D. malleable

E. tough

180. Monel metal contains_________________?
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A. none of the above

B. 88% copper and 10% tin and rest zinc

C. alloy of tin, lead and cadmium

D. malleable iron and zinc

E. 63 to 67% nickel and 30% copper