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Total Questions : 1535 | Page 8 of 154 pages
Question 71. German silver contains
  1.     1% silver
  2.     2% silver
  3.     5% silver
  4.     No silver
 Discuss Question
Answer: Option D. ->  No silver
Explanation :
Question 72. Free carbon in iron makes the metal
  1.     Soft and gives a coarse grained crystalline structure
  2.     Soft and gives a fine grained crystalline structure
  3.     Hard and gives a coarse grained crystalline structure
  4.     Hard and gives a fine grained crystalline structure
 Discuss Question
Answer: Option A. ->  Soft and gives a coarse grained crystalline structure
Explanation :
Question 73. Combined carbon in iron makes the metal
  1.     Soft and gives coarse grained crystalline structure
  2.     Soft and gives a fine grained crystalline structure
  3.     Hard and gives a coarse grained crystalline structure
  4.     Hard and gives a fine grained crystalline structure
 Discuss Question
Answer: Option D. ->  Hard and gives a fine grained crystalline structure
Explanation :
Question 74. In mottled cast iron, carbon is available in
  1.     Free form
  2.     Combined form
  3.     Nodular form
  4.     Partly in free and partly in combined state
 Discuss Question
Answer: Option D. ->  Partly in free and partly in combined state
Explanation :
Question 75. The presence of hydrogen in steel causes
  1.     Reduced neutron absorption cross-section
  2.     Improved Weldability
  3.     Embrittlement
  4.     Corrosion resistance
 Discuss Question
Answer: Option C. ->  Embrittlement
Explanation :
Question 76. The hardness and tensile strength in austenitic stainless steel can be increased by
  1.     Hardening and cold working
  2.     Normalizing
  3.     Martempering
  4.     Full annealing
 Discuss Question
Answer: Option A. ->  Hardening and cold working
Explanation :
Question 77. Addition of manganese to aluminium results in
  1.     Improvement of casting characteristics
  2.     Improvement of corrosion resistance
  3.     One of the best known age and precipitation hardening systems
  4.     Improving machinability
 Discuss Question
Answer: Option B. ->  Improvement of corrosion resistance
Explanation :
Question 78. The machinability of steel is improved by adding
  1.     Nickel
  2.     Chromium
  3.     Nickel and chromium
  4.     Sulphur, lead and phosphorus
 Discuss Question
Answer: Option D. ->  Sulphur, lead and phosphorus
Explanation :
Question 79. Aluminium bronze contains
  1.     94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
  2.     92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
  3.     10% aluminium and 90% copper
  4.     90% magnesium and 9% aluminium with some copper
 Discuss Question
Answer: Option C. ->  10% aluminium and 90% copper
Explanation :
Question 80. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°c will
  1.     Increase
  2.     Decrease
  3.     Remain same
  4.     First increase and then decrease
 Discuss Question
Answer: Option A. ->  Increase
Explanation :

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