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MCQs

Total Questions : 115 | Page 4 of 12 pages
Question 31. A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10⁵ N/m², find overall mass density.
  1.    4.156 kg/m³
  2.    3.156 kg/m³
  3.    2.156 kg/m³
  4.    1.156 kg/m³
 Discuss Question
Answer: Option D. -> 1.156 kg/m³
Answer: (d).1.156 kg/m³
Question 32. A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10⁵ N/m², find mass fraction of oxygen
  1.    0.133
  2.    0.233
  3.    0.333
  4.    0.433
 Discuss Question
Answer: Option B. -> 0.233
Answer: (b).0.233
Question 33. A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10⁵ N/m², find molar fraction of nitrogen
  1.    0.79
  2.    0.21
  3.    0.23
  4.    0.13
 Discuss Question
Answer: Option A. -> 0.79
Answer: (a).0.79
Question 34. A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10⁵ N/m², find the average molecular weight of the mixture
  1.    28.84
  2.    29.84
  3.    30.84
  4.    31.84
 Discuss Question
Answer: Option A. -> 28.84
Answer: (a).28.84
Question 35. In which of the following conditions mass transfer will occur spontaneously? C and z is concentration and distance respectively.
  1.    dC/dz>0
  2.    dC/dz<0
  3.    dC/dz=0
  4.    None of the Mentioned
 Discuss Question
Answer: Option B. -> dC/dz<0
Answer: (b).dC/dz<0
Question 36. The empirical correlation for local mass transfer coefficient for turbulent boundary layer flow past a flat plate is given by
  1.    Shₓ = 0.332 (Re)⁰.⁵ (Sc)⁰.³³
  2.    Shₓ = 0.332 (Re)⁰.⁶ (Sc)⁰.³³
  3.    Shₓ = 0.0298 (Re)⁰.⁷ (Sc)⁰.³³
  4.    Shₓ = 0.0298 (Re)⁰.⁸ (Sc)⁰.³³
 Discuss Question
Answer: Option D. -> Shₓ = 0.0298 (Re)⁰.⁸ (Sc)⁰.³³
Answer: (d).Shₓ = 0.0298 (Re)⁰.⁸ (Sc)⁰.³³
Question 37. Sherwood number is a function of
  1.    Lewis number and Reynolds number
  2.    Prandtl number and Lewis number
  3.    Reynolds number and Schmidt number
  4.    Schmidt number and Lewis number
 Discuss Question
Answer: Option C. -> Reynolds number and Schmidt number
Answer: (c).Reynolds number and Schmidt number
Question 38. What is the melting point of cobalt?
  1.    1449 K
  2.    1559 K
  3.    1669 K
  4.    1769 K
 Discuss Question
Answer: Option D. -> 1769 K
Answer: (d).1769 K
Question 39. The expression for average mass transfer coefficient is
  1.    Sh = 0.664 (Re)⁰.⁵ (Sc)⁰.³³
  2.    Sh = 0.664 (Re)⁰.⁶ (Sc)⁰.³³
  3.    Sh = 0.332 (Re)⁰.⁷ (Sc)⁰.³³
  4.    Sh = 0.332 (Re)⁰.⁸ (Sc)⁰.³³
 Discuss Question
Answer: Option A. -> Sh = 0.664 (Re)⁰.⁵ (Sc)⁰.³³
Answer: (a).Sh = 0.664 (Re)⁰.⁵ (Sc)⁰.³³
Question 40. What is the melting point of chromium?
  1.    2118 K
  2.    2218 K
  3.    2318 K
  4.    2418 K
 Discuss Question
Answer: Option A. -> 2118 K
Answer: (a).2118 K

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