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MCQs

Total Questions : 63 | Page 4 of 7 pages
Question 31. Boiling refers to a change from the
  1.    Solid to a liquid phase
  2.    Vapor to a liquid phase
  3.    Liquid to a solid phase
  4.    Liquid to a vapor phase
 Discuss Question
Answer: Option D. -> Liquid to a vapor phase
Answer: (d).Liquid to a vapor phase
Question 32. Maximum heat transfer rate in a modern boiler is about
  1.    2 * 10⁵ W/m²
  2.    3 * 10⁵ W/m²
  3.    4 * 10⁵ W/m²
  4.    5 * 10⁵ W/m²
 Discuss Question
Answer: Option A. -> 2 * 10⁵ W/m²
Answer: (a).2 * 10⁵ W/m²
Question 33. Which type of boiling occurs in steam boilers employing natural convection?
  1.    Forced convection
  2.    Pool
  3.    Local
  4.    Saturated
 Discuss Question
Answer: Option B. -> Pool
Answer: (b).Pool
Question 34. The boiling process has wide-spread applications in
(i) Production of steam in nuclear and steam power plants for generation and for industrial processes and space heating
(ii) Absorption of heat in refrigeration and air-conditioning systems
(iii) Concentration, dehydration and drying of foods and materials
Identify the correct statements
  1.    1 and 2
  2.    2 and 3
  3.    1, 2 and 3
  4.    1 and 3
 Discuss Question
Answer: Option C. -> 1, 2 and 3
Answer: (c).1, 2 and 3
Question 35. In which type of boiling the fluid motion is induced by external means?
  1.    Pool
  2.    Local
  3.    Forced convection
  4.    Subcooled
 Discuss Question
Answer: Option C. -> Forced convection
Answer: (c).Forced convection
Question 36. The transition from laminar to turbulent flow occurs at a critical Reynolds number of
  1.    1800
  2.    2200
  3.    2600
  4.    3000
 Discuss Question
Answer: Option A. -> 1800
Answer: (a).1800
Question 37. A condenser is to be designed to condense 225.0 kg of steam per hour at a pressure of 0.15 bar. A square array of 400 tubes, each of 6 mm in diameter, is available for the task. If the tube surface temperature is to be maintained at 26 degree Celsius, make calculations for the length of the tube
  1.    4.353 m
  2.    3.353 m
  3.    2.353 m
  4.    1.353 m
 Discuss Question
Answer: Option D. -> 1.353 m
Answer: (d).1.353 m
Question 38. The outer surface of a vertical tube is 1.25 m long and outer diameter is 50 mm is exposed to saturated steam at atmospheric pressure. If the tube surface is maintained at 80 degree Celsius by the flow of cooling water through it, determine the rate of heat transfer to the coolant
  1.    47648 W
  2.    12345 W
  3.    19879 W
  4.    97123 W
 Discuss Question
Answer: Option C. -> 19879 W
Answer: (c).19879 W
Question 39. What is the value of Reynolds number in terms of mass flow rate?
(Where, δ is length of the plate and b is width of the plate)
  1.    4 m/δ b
  2.    2 m/δ b
  3.    3 m/δ b
  4.    m /δ b
 Discuss Question
Answer: Option A. -> 4 m/δ b
Answer: (a).4 m/δ b
Question 40. What is the value of characteristics length in turbulent film condensation?
(Where, δ is length of the plate)
  1.    δ
  2.    3 δ
  3.    2 δ
  4.    4 δ
 Discuss Question
Answer: Option D. -> 4 δ
Answer: (d).4 δ

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