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MCQs

Total Questions : 68 | Page 4 of 7 pages
Question 31. __________ experiences creep at room temperature.
  1.    Iron
  2.    Copper
  3.    Nickel
  4.    Lead
 Discuss Question
Answer: Option D. -> Lead
Answer: (d).Lead
Question 32. _______ is known as steady-state creep.
  1.    Primary creep
  2.    Secondary creep
  3.    Tertiary creep
  4.    Quaternary creep
 Discuss Question
Answer: Option B. -> Secondary creep
Answer: (b).Secondary creep
Question 33. The time required for the occurrence of creep is known as _________
  1.    Creep resistance
  2.    Creep life
  3.    Creep limit
  4.    Creep recurrence
 Discuss Question
Answer: Option B. -> Creep life
Answer: (b).Creep life
Question 34. Which of the following does not affect creep?
  1.    Grain size
  2.    Thermal stability
  3.    Chemical reactions
  4.    Crystal structure
 Discuss Question
Answer: Option D. -> Crystal structure
Answer: (d).Crystal structure
Question 35. Which of the following will be rendered useless for prevention of creep?
  1.    Coarse-grained material
  2.    Strain hardening
  3.    Precipitation hardening
  4.    Quenching
 Discuss Question
Answer: Option D. -> Quenching
Answer: (d).Quenching
Question 36. MgO and Al₂O₃ can be used at high temperature creep resistance due to _________
  1.    High melting point
  2.    High oxygen concentration
  3.    Low density
  4.    Chemical stability
 Discuss Question
Answer: Option A. -> High melting point
Answer: (a).High melting point
Question 37. Strengthening of an iron base, nickel bade, and cobalt base alloys is done by __________
  1.    Precipitation hardening
  2.    Grain boundary hardening
  3.    Dispersion hardening
  4.    Transformation hardening
 Discuss Question
Answer: Option C. -> Dispersion hardening
Answer: (c).Dispersion hardening
Question 38. Iron base alloys have melting point around __________
  1.    900°C
  2.    1500°C
  3.    1900°C
  4.    2400°C
 Discuss Question
Answer: Option B. -> 1500°C
Answer: (b).1500°C
Question 39. Why can’t cold working be used for strengthening in case of plastic deformation?
  1.    Recrystallization
  2.    Thermal instability
  3.    Lowers tensile strength
  4.    Introduces coarsening
 Discuss Question
Answer: Option A. -> Recrystallization
Answer: (a).Recrystallization
Question 40. The ability of a material to return to its original state when an external force is removed is called __________
  1.    Plasticity
  2.    Elasticity
  3.    Pseudo-elasticity
  4.    Resilience
 Discuss Question
Answer: Option B. -> Elasticity
Answer: (b).Elasticity

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