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MCQs

Total Questions : 5013 | Page 3 of 502 pages
Question 21. Electrochemical corrosion can occur, only if __________ is present in contact with metal.
  1.    Air
  2.    Oxygen
  3.    Liquid medium
  4.    Gaseous medium
 Discuss Question
Answer: Option C. -> Liquid medium
Question 22. A spring material should have low
  1.    Elastic limit
  2.    Deflection value
  3.    Fatigue resistance
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 23. Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?
  1.    Copper
  2.    Mercury
  3.    Lead
  4.    None of these
 Discuss Question
Answer: Option B. -> Mercury
Question 24. Alloy powder manufactured by the following process have spherical shapes.
  1.    Electrochemical deposition
  2.    Gaseous reduction
  3.    Atomisation
  4.    Mechanical attrition
 Discuss Question
Answer: Option C. -> Atomisation
Question 25. Fire refining process is employed in case of
  1.    Tin
  2.    Copper
  3.    Zinc
  4.    Aluminium
 Discuss Question
Answer: Option B. -> Copper
Question 26. Hot extrusion process is not used for making
  1.    Cast iron pipe for domestic water supply
  2.    Aluminium curtain rods
  3.    Stainless steel tubes used in furnitures
  4.    Any of these
 Discuss Question
Answer: Option A. -> Cast iron pipe for domestic water supply
Question 27. Addition of beryllium to copper is done mainly to produce a/an __________ alloy.
  1.    Non-sparking & non-magnetic
  2.    High strength
  3.    Precipitation hardenable
  4.    Corrosion resistant
 Discuss Question
Answer: Option A. -> Non-sparking & non-magnetic
Question 28. Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.
  1.    Uniform
  2.    Oxygen diffusion
  3.    Pitting
  4.    Inter-granular
 Discuss Question
Answer: Option C. -> Pitting
Question 29. In __________ process, ions of salts react with water to produce acidity or alkalinity.
  1.    Hydration
  2.    Hydrolysis
  3.    Electrolysis
  4.    Dialysis
 Discuss Question
Answer: Option B. -> Hydrolysis
Question 30. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
  1.    159
  2.    1837
  3.    2537
  4.    10000
 Discuss Question
Answer: Option C. -> 2537

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