Mechanical Properties And Testing(Engineering > Engineering Materials ) Questions and Answers

Question 1. __________ is used as a catalyst in siliconizing.
  1.    Hydrogen peroxide
  2.    Chlorine gas
  3.    Sulfuric acid
  4.    Magnesium sulfate
Explanation:-
Answer: Option B. -> Chlorine gas
Answer: (b).Chlorine gas
Question 2. Usage of ___________ for metallizing helps spray the metal powder in the correct place.
  1.    Air, oxygen, and combustible gas
  2.    Oxyacetylene powder gun
  3.    Silicon dioxide
  4.    Hydrogen peroxide
Explanation:-
Answer: Option B. -> Oxyacetylene powder gun
Answer: (b).Oxyacetylene powder gun
Question 3. What is the hardness of molybdenum powder?
  1.    168-183 Vickers
  2.    246-263 Vickers
  3.    321-368 Vickers
  4.    330-390 Vickers
Explanation:-
Answer: Option C. -> 321-368 Vickers
Answer: (c).321-368 Vickers
Question 4. Plasma is metal spraying can obtain temperatures up to ________
  1.    10,000 F
  2.    20,000 F
  3.    30,000 F
  4.    60,000 F
Explanation:-
Answer: Option C. -> 30,000 F
Answer: (c).30,000 F
Question 5. Which of the following can be used for hard coating applications?
  1.    High-chromium stainless steel
  2.    Heat-treated stainless steel
  3.    Hardened brass
  4.    Aluminum
Explanation:-
Answer: Option A. -> High-chromium stainless steel
Answer: (a).High-chromium stainless steel
Question 6. How does the amount of cobalt affect the wear of alloys?
  1.    High cobalt high wear
  2.    Low cobalt high wear
  3.    No cobalt high wear
  4.    Cobalt does not affect the wear
Explanation:-
Answer: Option A. -> High cobalt high wear
Answer: (a).High cobalt high wear
Question 7. Increase of hardness of an alloy with an increase in time is known as ________
  1.    Age hardening
  2.    Solution hardening
  3.    Dispersion hardening
  4.    Phase transformation hardening
Explanation:-
Answer: Option A. -> Age hardening
Answer: (a).Age hardening
Question 8. Which of the following is not a stage of the age-hardening process?
  1.    Heating
  2.    Quenching
  3.    Tempering
  4.    Aging
Explanation:-
Answer: Option C. -> Tempering
Answer: (c).Tempering
Question 9. What is the relation of solubility and temperature for an age-hardening alloy?
  1.    Increases with decrease in temperature
  2.    Decreases with decrease in temperature
  3.    Increases irrespective of temperature
  4.    No change due to temperature
Explanation:-
Answer: Option B. -> Decreases with decrease in temperature
Answer: (b).Decreases with decrease in temperature
Question 10. Carbon steels containing ________ carbon are easier to hard-face.
  1.    < 0.35%
  2.    3.2%
  3.    5.18%
  4.    > 6.77%
Explanation:-
Answer: Option A. -> < 0.35%
Answer: (a).< 0.35%
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