engineering materials MCQs – Page 8

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

engineering materials Mcqs
141. Grey cast iron_____________________?
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A. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable

B. is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material

C. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

D. is produced by annealing process. I is soft, tough and easily machinec metal

E. none of the above is true

142. Brass contains___________________?
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A. 70-75% copper and rest tin

B. 90% copper and 10% tin

C. 85-92% copper and rest tin with little lead and nickel

D. 70% copper and 30% zinc

E. 70% copper and 30% tin

143. Basic constituents of Monel metal are _________________?
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A. zinc, tin, lead

B. nickel, lead and tin

C. nickel, molybdenum

D. nickel, copper

E. none of the above

144. Corrundum contains more than 95% _____________________?
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A. steel

B. A1203

C. MgO

D. german silver

E. Si02

145. Bronze contains_____________________?
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A. 85-92% copper and rest tin with little lead and nickel

B. 90% copper and 10% tin

C. 70-75% copper and rest tin

D. 70% copper and 30% zinc

E. 90% copper and 10% zinc

146. Which of the following represents the allotropic forms of iron__________________?
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A. alpha iron, gamma from and delta iron

B. alpha iron and beta iron

C. alpha iron, beta iron and gamma iron

D. body centred cubic a-iron and face centred cubic a-iron

E. none of the above

147. In malleable iron, carbon is present in the form of___________________?
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A. free carbon

B. nodular aggregates of graphite

C. flakes

D. spheroids

E. cementite

148. Sulphur in steel________________?
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A. reduces the grain size

B. acts as deoxidiser

C. decreases tensile strength and hardness

D. increases hardness

E. lowers the toughness and transverse ductility
149. Pick up wrong statement about wrought iron ?
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A. It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

B. It can be easily forge welded

C. It is very soft and ductile

D. It melts at 1535C

E. It contains carbon of the order of 0 to 0.25%

150. German silver contains_________________?
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A. 1% silver

B. 2.5% silver

C. 10% silver

D. 5% silver

E. 100% silver

151. Which of the following is the binding material in cemented carbides___________________?
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A. nickel

B. cobalt

C. vanadium

D. iron

E. carbon

152. Gamma iron exits at following temperature___________________?
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A. near melting point

B. room temperature

C. between 1400C and 1539C

D. none of the above

E. between 910C and 1400C
153. An example of amorphous material is____________?
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A. silver

B. zinc

C. brass

D. lead

E. glass
154. Connecting rod is usually made of_________________?
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A. cast iron

B. low carbon steel

C. medium carbon steel

D. aluminium

E. high carbon steel

155. Taps, dies and drills contain carbon________________?
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A. below 1%

B. below 0.5%

C. above 1%

D. nil

E. above 2.2%

156. Induction hardening is the process of_____________________?
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A. increasing hardness throughout

B. hardening surface of workpiece to ob-tain hard and wear resistant surface

C. heating and cooling rapidly

D. hardening core

E. inducing hardness by continuous process

157. Cyaniding is the process of________________?
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A. dipping steel in cyanide bath

B. reacting steel surface with cyanide salts

C. adding carbon and nitrogen by heat treatment of steel to increase its surface hardness

D. making corrosion resistant steel

E. obtaining cyanide salts

158. Steel made from phosphatic iron is_________________?
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A. ductile

B. malleable

C. hard

D. tough

E. brittle
159. The basic constituents of Hastelloy are_________________?
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A. all of the above

B. aluminium, copper etc

C. none of the above

D. nickel, molybdenum etc

E. nickel, copper, etc

160. Following elements have face-centred cubic structure__________________?
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A. a iron (below 910C and between 1400 to 1539C), W

B. all of the above

C. gamma iron (910 to 1400C), Cu, Ag, Au, Al, Ni, Pb, Pt

D. Mg, Zn, Ti, Zr, Br, Cd

E. none of the above