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MCQs

Total Questions : 1977 | Page 22 of 198 pages
Question 211. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?
  1.    Invar
  2.    Constantan
  3.    Chromel
  4.    Alumel
 Discuss Question
Answer: Option A. -> Invar
Question 212. Most of the common metals have __________ crystal structure.
  1.    Cubic
  2.    Hexagonal
  3.    Orthorhombic
  4.    None of these
 Discuss Question
Answer: Option A. -> Cubic
Question 213. In drop forging process, the forging is done by dropping the __________ at high velocity.
  1.    Hammer
  2.    Workpiece
  3.    Die with hammer
  4.    Weight on hammer
 Discuss Question
Answer: Option C. -> Die with hammer
Question 214. Liners of a ball mill are never made of
  1.    Lead
  2.    Alloy steel
  3.    Rubber or ceramic material
  4.    Cast iron
 Discuss Question
Answer: Option A. -> Lead
Question 215. Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is
  1.    Used for making axle & shafts of aeroplanes, automobiles and locomotives
  2.    Having poor fatigue resistance
  3.    Having poor toughness
  4.    Not helpful in producing cleaner steel due to oxidising action of vanadium
 Discuss Question
Answer: Option A. -> Used for making axle & shafts of aeroplanes, automobiles and locomotives
Question 216. Approximate value of the modulus of elasticity for steel is about __________ x l0⁶kg/cm².
  1.    0.5
  2.    2
  3.    40
  4.    75
 Discuss Question
Answer: Option B. -> 2
Question 217. Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property?
  1.    Silicon
  2.    Phosphorus
  3.    Sulphur
  4.    None of these
 Discuss Question
Answer: Option A. -> Silicon
Question 218. An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called
  1.    Constantan
  2.    Kanthal
  3.    Chromel
  4.    German silver
 Discuss Question
Answer: Option A. -> Constantan
Question 219. Brinell Hardness Number (BHN) for talc is approximately in the range of
  1.    1-5
  2.    20-30
  3.    100 -150
  4.    200 - 250
 Discuss Question
Answer: Option B. -> 20-30
Question 220. Rubber lined vessels are corroded by the action of
  1.    Aqua regia
  2.    Chloroform
  3.    Sulphuric acid (95%)
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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