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MCQs

Total Questions : 72 | Page 3 of 8 pages
Question 21. Statement 1: Film-type condensation has a higher heat transfer co-efficient than drop-wise condensation.
Statement 2: Drop-wise condensation is easier to maintain than Film-type condensation
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option C. -> False, False
Answer: (c).False, False
Question 22. Statement 1: Drop-wise condensation takes place on a smooth surface.
Statement 2: All the resistance to heat transfer lies in the film formed during Film-type condensation.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option D. -> False, True
Answer: (d).False, True
Question 23. Statement 1: In nusselt’s film theory, velocity of the falling film is not affected by the velocity of the vapors.
Statement 2: LMTD can be used provided the overall heat transfer co-efficient is constant over a large range of temperatures.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 24. Find heat transfer in an agitated jacketed vessel if Nᵣₑᵢ is 1.5 * 105 and Nₚᵣ is 20.
  1.    0.9
  2.    1.2
  3.    1.8
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> 0.9
Answer: (a).0.9
Question 25. Statement 1: G is known as the mass flux and it is the product of density and velocity.
Statement 2: Grashof number is associated with forced convection.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option A. -> True, False
Answer: (a).True, False
Question 26. Which of the following is NOT a real dimensionless number?
  1.    Pectit number
  2.    Stanton number
  3.    Graetz number
  4.    Grashof number
 Discuss Question
Answer: Option A. -> Pectit number
Answer: (a).Pectit number
Question 27. Statement 1: Nₚᵣ= (Cₚm)/kl
Statement 2: Stanton number is a product of Nᵣₑ and Nₚᵣ.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option C. -> False, False
Answer: (c).False, False
Question 28. Which of the following sentences is true?
  1.    Direct heating has higher heat transfer rates than indirect heating
  2.    Indirect heating has higher heat transfer rates than direct heating
  3.    Both of them have the same heat transfer rates
  4.    Cannot be determined
 Discuss Question
Answer: Option A. -> Direct heating has higher heat transfer rates than indirect heating
Answer: (a).Direct heating has higher heat transfer rates than indirect heating
Question 29. In deep freezers, the walls absorb heat from food materials by _____ and keep them cool.
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    None of the mentioned
 Discuss Question
Answer: Option C. -> Radiation
Answer: (c).Radiation
Question 30. Statement 1: Radiation dryers are used to dry grains and reduce their moisture content before storage.
Statement 2: Baking ovens are used both for making the dough and after that’s made, making biscuits by cutting them and baking them further. This entire process uses radiation.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True

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