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Total Questions : 1535 | Page 6 of 154 pages
Question 51. Ferromagnetic alpha iron exists in temperature range of
  1.     Below 723°C
  2.     770 to 910°C
  3.     910 to 1440°C
  4.     1400 to 1539°C
 Discuss Question
Answer: Option A. ->  Below 723°C
Explanation :
Question 52. The material in which the atoms are arranged regularly in some directions but not in others, is called
  1.     Amorphous material
  2.     Mesomorphous material
  3.     Crystalline material
  4.     None of these
 Discuss Question
Answer: Option B. ->  Mesomorphous material
Explanation :
Question 53. Gamma iron exits at following temperature
  1.     Room temperature
  2.     Near melting point
  3.     Between 1400°C and 1539°C
  4.     Between 910°C and 1400°C
 Discuss Question
Answer: Option D. ->  Between 910°C and 1400°C
Explanation :
Question 54. In process annealing, the hypo eutectoid steel is
  1.     Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
  2.     Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
  3.     Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
  4.     Heated below or closes to the lower critical temperature and then cooled slowly
 Discuss Question
Answer: Option D. ->  Heated below or closes to the lower critical temperature and then cooled slowly
Explanation :
Question 55. Admiralty gun metal contains
  1.     63 to 67% nickel and 30% copper
  2.     88% copper, 10% tin and rest zinc
  3.     Alloy of tin, lead and cadmium
  4.     Iron scrap and zinc
 Discuss Question
Answer: Option B. ->  88% copper, 10% tin and rest zinc
Explanation :
Question 56. Duralumin contains
  1.     3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
  2.     3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
  3.     4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
  4.     5 to 6% tin, 2 to 3% copper and rest aluminium
 Discuss Question
Answer: Option A. ->  3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
Explanation :
Question 57. Which of the following is an amorphous material?
  1.     Mica
  2.     Silver
  3.     Lead
  4.     Glass
 Discuss Question
Answer: Option D. ->  Glass
Explanation :
Question 58. Which of the following is used for bearing liner?
  1.     Gun metal
  2.     Bronze
  3.     Bell metal
  4.     Babbitt metal
 Discuss Question
Answer: Option D. ->  Babbitt metal
Explanation :
Question 59. Which of the following property is desirable for materials used in tools and machines?
  1.     Elasticity
  2.     Plasticity
  3.     Ductility
  4.     Malleability
 Discuss Question
Answer: Option A. ->  Elasticity
Explanation :
Question 60. The usual composition of a soldering alloy is
  1.     Tin, lead and small percentage of antimony
  2.     Tin and lead
  3.     Tin, lead and silver
  4.     Tin and copper
 Discuss Question
Answer: Option A. ->  Tin, lead and small percentage of antimony
Explanation :

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