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MCQs

Total Questions : 1535 | Page 5 of 154 pages
Question 41. The charge is fed into the blast furnace through the
  1.     Stack
  2.     Throat
  3.     Bosh
  4.     Tyres
 Discuss Question
Answer: Option B. ->  Throat
Explanation :
Question 42. Pipes for bicycle frames are made of
  1.     Cold rolled steel
  2.     Hot rolled steel
  3.     Forged steel
  4.     Cast steel
 Discuss Question
Answer: Option A. ->  Cold rolled steel
Explanation :
Question 43. In which of the following cases, consideration of creep is important
  1.     Flywheel of steam engine
  2.     Cast iron pipes
  3.     Cycle chains
  4.     Gas turbine blades
 Discuss Question
Answer: Option D. ->  Gas turbine blades
Explanation :
Question 44. Aluminium bronze contains aluminium and copper in the ratio of
  1.     50 : 50
  2.     40 : 60
  3.     60 : 40
  4.     10 : 90
 Discuss Question
Answer: Option D. ->  10 : 90
Explanation :
Question 45. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
  1.     Eutectic cast irons
  2.     Hypoeutectic cast irons
  3.     Hypereutectic cast irons
  4.     None of these
 Discuss Question
Answer: Option B. ->  Hypoeutectic cast irons
Explanation :
Question 46. A material is known as allotropic or polymorphic if it
  1.     Has a fixed structure under all conditions
  2.     Exists in several crystal forms at different temperatures
  3.     Responds to heat treatment
  4.     Has its atoms distributed in a random pattern
 Discuss Question
Answer: Option B. ->  Exists in several crystal forms at different temperatures
Explanation :
Question 47. Sulphur in cast iron
  1.     Makes the iron soft and easily machinable
  2.     Increases hardness and brittleness
  3.     Make the iron white and hard
  4.     Aids fusibility and fluidity
 Discuss Question
Answer: Option B. ->  Increases hardness and brittleness
Explanation :
Question 48. An example of amorphous material is
  1.     Zinc
  2.     Lead
  3.     Silver
  4.     Glass
 Discuss Question
Answer: Option D. ->  Glass
Explanation :
Question 49. Process of austempering results in
  1.     Formation of bainite structure
  2.     Carburised structure
  3.     Martenistic structure
  4.     Lamellar layers of carbide distributed throughout the structure
 Discuss Question
Answer: Option A. ->  Formation of bainite structure
Explanation :
Question 50. Which is false statement about tempering? tempering is done to
  1.     Improve machinability
  2.     Improve ductility
  3.     Improve toughness
  4.     Release stresses
 Discuss Question
Answer: Option A. ->  Improve machinability
Explanation :

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