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Total Questions : 166 | Page 17 of 17 pages
Question 161. Which of the following gives materials in order of decreasing values of permeability?
  1.     Cobalt, nickel, aluminium, iron.
  2.      Permalloy, nickel, air, water.
  3.     Pure iron, silicon iron, aluminium, bismuth.
  4.     Silver, copper, aluminium, iron.
 Discuss Question
Answer: Option B. ->   Permalloy, nickel, air, water.
Question 162. In Brinell hardness testing the time of loading is
  1.    5 minutes
  2.    1 minute
  3.    15 seconds
  4.    30 seconds
 Discuss Question
Answer: Option B. -> 1 minute
Question 163. The specific gravity of cast iron is closer to
  1.    11
  2.    9
  3.    7
  4.    5
 Discuss Question
Answer: Option B. -> 9
Question 164. Malleable cast iron is produced
  1.    by adding magnesium to molten cast iron
  2.    by quick cooling of molten cast iron
  3.    from white cast iron by annealing process
  4.    none of these
 Discuss Question
Answer: Option C. -> from white cast iron by annealing process
Question 165. Thermoplastic materials are those materials which
  1.    are formed into shape under heat and pressure and results in a permanently hard product
  2.    do not become hard with the application of heat and pressure and no chemical change occurs
  3.    are flexible and can withstand considerable wear under suitable conditions
  4.    are used as a friction lining for clutches and brakes
 Discuss Question
Answer: Option B. -> do not become hard with the application of heat and pressure and no chemical change occurs
Question 166. Tungsten when added to steel __________ the critical temperature
  1.    does not effect
  2.    lowers
  3.    raises
  4.    none of the above
 Discuss Question
Answer: Option C. -> raises

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