Engineering Materials

181. Which of the following elements does not impart hardness to steel

  1. copper
  2. chromium
  3. nickel
  4. silicon
  5. none of the above.

Correct answer: (A)
copper

182. Which of the following has highest specific strength of all structural materials

  1. magnesium alloys
  2. titanium alloys
  3. chromium alloys
  4. magnetic steel alloys
  5. none of the above.

Correct answer: (B)
titanium alloys

183. Which of the following is not the correct method of increasing fatigue limit

  1. shot peening
  2. nitriding of surface
  3. cold working
  4. surface decarburisation
  5. under-stressing.

Correct answer: (D)
surface decarburisation

184. Which of the following is the binding material in cemented carbides

  1. cobalt
  2. nickel
  3. vanadium
  4. iron
  5. carbon.

Correct answer: (A)
cobalt

185. Which of the following is used for bearing liner

  1. gun metal
  2. bronze
  3. bell metal
  4. babbit metal
  5. brass.

Correct answer: (D)
babbit metal

186. Which of the following pipes is least corrosion resistant

  1. brass
  2. mild steel
  3. cast iron
  4. wrought iron
  5. copper.

Correct answer: (D)
wrought iron

187. Which of the following represents the allotropic forms of iron

  1. alpha iron, beta iron and gamma iron
  2. alpha iron and beta iron
  3. body centred cubic a-iron and face centred cubic a-iron
  4. alpha iron, gamma from and delta iron
  5. none of the above.

Correct answer: (D)
alpha iron, gamma from and delta iron

188. Which one of the following metals would work-harden more quickly than the others?

  1. copper
  2. brass
  3. lead
  4. silver
  5. aluminium.

Correct answer: (B)
brass

189. White cast iron

  1. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
  2. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
  3. is produced by annealing process. It is soft, tough and easily machined metal
  4. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
  5. none of the above.

Correct answer: (B)
is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

190. White cast iron contains carbon in the form of

  1. free carbon
  2. graphite
  3. cementite
  4. white carbon
  5. ferrite.

Correct answer: (C)
cementite

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