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MCQs

Total Questions : 38 | Page 1 of 4 pages
Question 1. Which of the following is a property of fireclay?
  1.    Rigid under load
  2.    Poor resistance to spalling
  3.    Instability in volume
  4.    Poor resistance to attack by alkalies
 Discuss Question
Answer: Option A. -> Rigid under load
Answer: (a).Rigid under load
Question 2. What is the hardness of tungsten at room temperature?
  1.    250 VHN
  2.    480 VHN
  3.    155 VHN
  4.    60 VHN
 Discuss Question
Answer: Option B. -> 480 VHN
Answer: (b).480 VHN
Question 3. Which of the following is not a characteristic of tungsten?
  1.    Good strength
  2.    Good electrical conductivity
  3.    Heavy
  4.    Good insulation
 Discuss Question
Answer: Option D. -> Good insulation
Answer: (d).Good insulation
Question 4. TMZ is an alloy of _______
  1.    Tungsten
  2.    Magnesium
  3.    Molybdenum
  4.    Tin
 Discuss Question
Answer: Option C. -> Molybdenum
Answer: (c).Molybdenum
Question 5. How is the corrosion resistance of high alumina when compared against fireclay?
  1.    Higher
  2.    Equal
  3.    Lower
  4.    No resistance
 Discuss Question
Answer: Option A. -> Higher
Answer: (a).Higher
Question 6. TCP phase of nickel-based superalloys are formed at a temperature of _______
  1.    200°C
  2.    400°C
  3.    600°C
  4.    > 750°C
 Discuss Question
Answer: Option D. -> > 750°C
Answer: (d).> 750°C
Question 7. The thermal coating ‘thermally grown oxide’ is formed by the oxidation of _______
  1.    Silicon
  2.    Magnesium
  3.    Molybdenum
  4.    Aluminum
 Discuss Question
Answer: Option D. -> Aluminum
Answer: (d).Aluminum
Question 8. Which of the following applications does a tungsten-carbide coating provide?
  1.    Abrasion resistance
  2.    Corrosion resistance
  3.    Loss of coating mass
  4.    Heat resistance
 Discuss Question
Answer: Option C. -> Loss of coating mass
Answer: (c).Loss of coating mass
Question 9. Which of the following is not an effect of adding boron and silicon to superalloys?
  1.    Improves adhesion
  2.    Maintains oxide layer
  3.    Increases spalling
  4.    Reduces spalling
 Discuss Question
Answer: Option C. -> Increases spalling
Answer: (c).Increases spalling
Question 10. What is the value of dielectric constant of free space?
  1.    8.854 * 10⁻⁹ F m⁻¹
  2.    8.854 * 10⁻¹² F m⁻¹
  3.    8.854 * 10⁻¹⁵ F m⁻¹
  4.    8.854 * 10⁻⁶ F m⁻¹
 Discuss Question
Answer: Option B. -> 8.854 * 10⁻¹² F m⁻¹
Answer: (b).8.854 * 10⁻¹² F m⁻¹

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