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Total Questions : 1535 | Page 9 of 154 pages
Question 81. Gun metal contains
  1.     70% copper and 30% zinc
  2.     90% copper and 10% tin
  3.     85 - 92% copper and rest tin with little lead and nickel
  4.     70 - 78% copper and rest tin
 Discuss Question
Answer: Option C. ->  85 - 92% copper and rest tin with little lead and nickel
Explanation :
Question 82. Perminvar alloy having constant permeability is an alloy of
  1.     Nickel, copper and iron
  2.     Nickel, copper and zinc
  3.     Copper, nickel and antimony
  4.     Iron, zinc and bismuth
 Discuss Question
Answer: Option A. ->  Nickel, copper and iron
Explanation :
Question 83. Foundry crucible is made of
  1.     Mild steel
  2.     German silver
  3.     Lead
  4.     Graphite
 Discuss Question
Answer: Option D. ->  Graphite
Explanation :
Question 84. Which is the false statement about wrought iron? it has
  1.     High resistance to rusting and corrosion
  2.     High ductility
  3.     Ability of hold protective coating
  4.     Uniform strength in all directions
 Discuss Question
Answer: Option D. ->  Uniform strength in all directions
Explanation :
Question 85. Chilled cast iron has
  1.     No graphite
  2.     A very high percentage of graphite
  3.     A low percentage of graphite
  4.     Graphite as its basic constituent of composition
 Discuss Question
Answer: Option A. ->  No graphite
Explanation :
Question 86. The aluminium alloy, mainly used, for anodized utensil manufacture, is
  1.     Duralumin
  2.     Y-alloy
  3.     Magnalium
  4.     Hindalium
 Discuss Question
Answer: Option D. ->  Hindalium
Explanation :
Question 87. Which is false statement about normalizing? normalizing is done to
  1.     Refine grain structure
  2.     Reduce segregation in casting
  3.     Improve mechanical properties
  4.     Induce stresses
 Discuss Question
Answer: Option D. ->  Induce stresses
Explanation :
Question 88. The machinability of steel is increased by
  1.     Silicon and sulphur
  2.     Phosphorous, lead and sulphur
  3.     Sulphur, graphite and aluminium
  4.     Phosphorous and aluminium
 Discuss Question
Answer: Option B. ->  Phosphorous, lead and sulphur
Explanation :
Question 89. The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
  1.     Coordination number
  2.     Atomic packing factor
  3.     Space lattice
  4.     None of these
 Discuss Question
Answer: Option B. ->  Atomic packing factor
Explanation :
Question 90. White cast iron has
  1.     Carbon in the form of carbide
  2.     Low tensile strength
  3.     High compressive strength
  4.     All of these
 Discuss Question
Answer: Option D. ->  All of these
Explanation :

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