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MCQs

Total Questions : 72 | Page 7 of 8 pages
Question 61. Why is better to use a Jacketed vessel in the dairy industry than a stainless steel container directly?
  1.    To prevent milk from charring
  2.    To have a better temperature control
  3.    The temperature of food in the film = temperature of the wall which is very high. Hence, jacketed vessels are needed
  4.    All of the mentioned
 Discuss Question
Answer: Option D. -> All of the mentioned
Answer: (d).All of the mentioned
Question 62. Statement 1: hd/k is _____
Statement 2: _____ is the ratio of convective heat transfer to conductive heat transfer.
  1.    Prandtl number, Prandtl number
  2.    Nussel number, Nussel number
  3.    Pictet number, Pictet number
  4.    Fourier number, Fourier number
 Discuss Question
Answer: Option B. -> Nussel number, Nussel number
Answer: (b).Nussel number, Nussel number
Question 63. Фᵥ is generally taken as 1 in food processing as generally very high wall temperatures aren’t reached and hence (µ/µw) * 0.14 is 1 as there isn’t much difference in µ and µw.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: False, False
Question 64. Statement 1: Sieder-Tate and Dittus-boelter equations imply only to laminar flow conditions.
Statement 2: Under laminar conditions, the same equation applies both to Newtonian and Non-Newtonian fluids.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option C. -> False, False
Answer: (c).False, False
Question 65. Dittus-boelter equation is applicable for fluids with phase change.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 66. Statement 1: Radiation needs a medium to travel.
Statement 2: Thermal radiation takes place at a certain temperature for every body.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option C. -> False, False
Answer: (c).False, False
Question 67. Statement 1: Radiation is the transfer of heat by electromagnetic waves.
Statement 2: When heat is radiated from a hot source, the amount of heat received by the body depends on the nature of the body.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 68. Statement 1: Radiation is NOT heat.
Statement 2: Maximum value of absorptivity is 1.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 69. Which of the following reason does NOT affect radiation between two parallel bodies?
  1.    Angle of vision
  2.    Orientation of surfaces
  3.    Emissivity of both
  4.    Smoothness and roughness
 Discuss Question
Answer: Option A. -> Angle of vision
Answer: (a).Angle of vision
Question 70. The emission of radiation by any body is independent of the radiation by any body next to it.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True

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