Heat Transfer Operations MCQ

Test your knowledge with important Heat Transfer Operations MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Heat Transfer Operations MCQs at Bissoy

• An increase in number of tubes will lead to larger condensate thickness in the lower tubes leading to ____________ heat transfer coefficient
  ক

  Larger

  খ

  Smaller

  গ

  Zero

  ঘ

  Infinite
• A large value of temperature difference will lead to more condensation and hence a __________ heat transfer coefficient
  ক

  Larger

  খ

  Smaller

  গ

  Zero

  ঘ

  Infinite
• An increase in diameter means a _________ heat transfer coefficient.
  ক

  Larger

  খ

  Smaller

  গ

  Zero

  ঘ

  Infinite
• A high value of latent heat hfg means that the heat transfer coefficient would __________
  ক

  Increase

  খ

  Decrease

  গ

  Remains same

  ঘ

  Becomes zero
• If there is a decrease in viscosity, the heat transfer coefficient ____________
  ক

  Increase

  খ

  Decrease

  গ

  Remains same

  ঘ

  Becomes zero
• As thermal conductivity kF increases, the heat transfer coefficient ________
  ক

  Increases

  খ

  Decreases

  গ

  Remains same

  ঘ

  Jumps to a high value
• The Grimson’s correlation gives the set of parameters to be used to calculate the Nusselt number for the calculation of the heat transfer coefficient as Nu = C Ren Pr0.33.
  ক

  True

  খ

  False
• Which one of the following correctly represents the condensation process in a condenser?
  ক

  2-3’-3-4

  খ

  3’-3

  গ

  3-4

  ঘ

  2-3’-3
• What is the equation for Coefficient of performance of a condenser?
  ক

  COP = Qe/Qc

  খ

  COP = We/Qc

  গ

  COP = Wc/Qe

  ঘ

  COP = Qe/Wc
• What is the meaning of heat rejection ratio (HRR) of a condenser?
  ক

  Ratio of heat rejected to the heat absorbed

  খ

  Ratio of heat absorbed to the heat rejected

  গ

  Ratio of heat required to the heat lost

  ঘ

  Ratio of heat wasted in a cycle to the heat absorbed
• Evaporative condensers are used in places where water is _________
  ক

  Scarce

  খ

  Plenty

  গ

  Moderately available

  ঘ

  Sufficient
• Evaporative condensers combine the features of a _____________ in a single unit.
  ক

  Cooling tower and water-cooled condenser

  খ

  Falling tower and water-cooled condenser

  গ

  Cooling tower and Air condenser

  ঘ

  Rising film tower and water-cooled condenser
• In evaporative condensers, ___________ used to extract heat from the condensing refrigerant.
  ক

  Air is

  খ

  Both air and water are

  গ

  Water is

  ঘ

  Either air or water is
• Recognize the following water cooled condenser.
  ক

  Shell tube

  খ

  Double tube condenser

  গ

  Tube coil

  ঘ

  Shell coil
• In a shell and coil type water cooled condenser, the refrigerant is passed through the ________
  ক

  Coil

  খ

  Shell

  গ

  Tube

  ঘ

  Annulus
• In the double pipe setup of the water-type condenser, the cold water flows in the ___________
  ক

  Shell

  খ

  Annulus

  গ

  Inner Tube

  ঘ

  Jacket
• Double pipe water cooling condensers have a capacity at around ________
  ক

  10 TR

  খ

  20 TR

  গ

  30 TR

  ঘ

  50 TR
• Shell and coil type condensers have a capacity at around ________
  ক

  10 TR

  খ

  20 TR

  গ

  30 TR

  ঘ

  50 TR
• In the double pipe setup of the condenser, the refrigerant flows in the ___________
  ক

  Shell

  খ

  Annulus

  গ

  Inner Tube

  ঘ

  Jacket
• Water cooled condensers can be classified to three more categories, which one of the following is incorrect?
  ক

  Double pipe

  খ

  Plate type

  গ

  Shell-and-tube type

  ঘ

  Shell-and-coil type
• Which type of fins are the most commonly used fin type in condensers?
  ক

  Annular fin

  খ

  Plate type fins

  গ

  Tube fin

  ঘ

  Extended double pipe
• In traditional Air conditioners in home appliances, what is the type of condenser used?
  ক

  Natural convection type

  খ

  Forced convection type

  গ

  Flash Type

  ঘ

  Rotary condensers
• In traditional Refrigerators in home appliances, what is the type of condenser used?
  ক

  Natural convection type

  খ

  Forced convection type

  গ

  Furnace Type

  ঘ

  Rotary condensers
• The surface area of natural convection type condensers is _____________ the forced convection ones for same capacity.
  ক

  Less than

  খ

  More than

  গ

  Equal to

  ঘ

  Very much less than
• The fin spacing is usually preferred to be ___________ to minimize the fouling effect by dust and to allow free flow of air with little resistance.
  ক

  Large

  খ

  Small

  গ

  Very small

  ঘ

  Joint
• In natural convection type, heat transfer from the condenser is by buoyancy induced natural convection and radiation.
  ক

  True

  খ

  False
• Based on the external fluid/cooling medium, condensers can be divided into three parts. Which one of the following is not one of them?
  ক

  Air cooled condensers

  খ

  Water cooled condensers

  গ

  Evaporative condensers

  ঘ

  Sub-cooled liquid condensers
• What is the name of the process occurring represented by the line 3-4 in the given refrigeration cycle?
  ক

  Sensible, heating process

  খ

  Sensible, sub cooling process

  গ

  Entropy increase step

  ঘ

  Condensation
• Which one of the following pathway represents the condensation process of the refrigerant in a refrigeration cycle?
  ক

  2-3’

  খ

  3-4

  গ

  3′-3

  ঘ

  1-2
• The process 2-3’ is known as the ______________
  ক

  Evaporation

  খ

  De-superheating process

  গ

  Condensation

  ঘ

  Superheating process