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MCQs

Total Questions : 72 | Page 6 of 8 pages
Question 51. One disadvantage of microwave cooking is that the energy efficiency in this process is less.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 52. Statement 1: Microwave heating helps save electricity.
Statement 2: The quality of product in microwave heating is good hence rejections are lesser.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 53. Statement 1: The heat transfer co-efficient in ice is four times that of water.
Statement 2: k in conductance is for thermal conductivity.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 54. Statement 1: When the average radius gives an error, log mean radius is used.
Statement 2: Log mean radius is given by rL= ( r₀– rᵢ )/(ln(r₀/rᵢ))
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 55. Statement 1: α=k/(ρCₚ)
Statement 2: α stands for thermal conductivity.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option A. -> True, False
Answer: (a).True, False
Question 56. Statement 1: NFo stands for Fourier number.
Statement 2: NFo= (αtₜ)/s²
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 57. Frozen foods have a higher transfer co-efficient hence they lose heat faster than other food items when exposed to the outside environment.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 58. Statement 1: Nucleate Boiling is when a layer of film is formed in the beginning.
Statement 2: Boiling starts with the bottom layer which heats up, becomes light and goes up. That way everything becomes hot and there is not temperature difference and hence no heat transfer.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option D. -> False, True
Answer: (d).False, True
Question 59. Statement 1: When heat transfer takes between a solid surface and a fluid, an insulating film layer is formed. More is the agitation; more is the thickness of the film.
Statement 2: Within the film, the temperature varies from the wall to the temperature of the bulk.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option D. -> False, True
Answer: (d).False, True
Question 60. Statement 1: Nₚᵣ= (Cₚμ)/k
Statement 2: If Nₚᵣ is lesser than 1, Thermal Boundary layer is thinner than Hydrodynamic Boundary layer.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option A. -> True, False
Answer: (a).True, False

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