Packed Beds MCQ

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

• What is the term X in the calculation of Nusselt Number for the wall side? Nu=X Re0.5 Pr0.33
  ক

  0.027

  খ

  1.94

  গ

  0.0035

  ঘ

  0.023
• What is the Nusselt number for the wall side if give Reynolds number = 12000 and Prantl number = 0.47?
  ক

  165.75

  খ

  175.65

  গ

  167.65

  ঘ

  165.65
• Calculate hwall Re = 12000 Pr = 0.47 Kg = 15W/mK Radius of pellets = 15mm
  ক

  728 KW/m2K

  খ

  828 KW/m2K

  গ

  800 KW/m2K

  ঘ

  528 KW/m2K
• For the Calculation of hwall, identify the correct relation.
  ক

  Sieder Tate Equation

  খ

  hwallDp/Ke=1.94 Re0.5 Pr0.33

  গ

  hwallDp/Kg=1.94 Re0.5 Pr0.33

  ঘ

  hwallDt/Ke=1.94 Re0.5 Pr0.33
• The renowned equation used to calculate the pressure drop in a non-ideal packed bed is known as______________
  ক

  Sieder Tate Equation

  খ

  Kozeny Carman Equation

  গ

  Ergun Equation

  ঘ

  Arrhenius Equation
• Which one is the correct temperature profile for very low dp/di packed bed setup?
  ক

  Laminar temperature profile

  খ

  Turbulent Temperature profile

  গ

  Laminar near the walls and turbulent at the centre

  ঘ

  Turbulent near the walls and laminar at the centre
• Which one is the correct temperature profile for high dp/di Packed bed setup?
  ক

  Laminar temperature profile

  খ

  Turbulent Temperature profile

  গ

  Laminar near the walls and turbulent at the centre

  ঘ

  Turbulent near the walls and laminar at the centre
• For very low dp/di, the temperature pattern is similar to that of complete mixing and turbulent flow.
  ক

  True

  খ

  False
• The value of dp/di in the range _______ gives maximum heat transfer coefficient.
  ক

  0.15-0.2

  খ

  2-3

  গ

  0.6-0.9

  ঘ

  0.001-0.002
• In the expression given below, what is the expression Di? This given ratio defines voidage which is controlled to obtain maximum heat transfer coefficient. ∈ = Dp/Di
  ক

  Internal diameter of Pellets

  খ

  Internal diameter of Tube

  গ

  Internal diameter of Bed

  ঘ

  Internal diameter of Pellets
• The presence of particles makes the inside heat transfer coefficient higher than empty tube because the superficial velocity is _______ the actual velocity.
  ক

  Little higher than

  খ

  Very higher than

  গ

  Very less than

  ঘ

  Little less than
• When is the following equipment used?
  ক

  Exothermic Reaction

  খ

  Endothermic Reaction

  গ

  Heating operation

  ঘ

  Cooling operation
• What is the heat transfer area for the following setup?
  ক

  0.357m2

  খ

  0.4m2

  গ

  0.377m2

  ঘ

  0.3m2
• The particles are usually _______ packed near the wall of the tube.
  ক

  Tightly

  খ

  Loosely

  গ

  Very tightly

  ঘ

  Negligibly
• Which one of the following setup would have the following Temperature Profile?
  ক

  Shell and tube with hot fluid in shell and packed bed in tube

  খ

  Shell and tube with cold fluid in shell and packed bed in tube

  গ

  Shell and tube with hot fluid in tube and packed bed in shell

  ঘ

  Shell and tube with cold fluid in tube and packed bed in shell
• A fully packed bed with small particle size has _________ pressure drop than a bed with larger particle size.
  ক

  More

  খ

  Less

  গ

  Same

  ঘ

  Negligible
• Which one of the following is the correct expression for Friction Factor in Packed Bed Columns?
  ক

  f = 150/Re

  খ

  f = 150/Re+1.75

  গ

  f = 180/Re+1.5

  ঘ

  f = 100/Re+0.0035
• What is the relation between superficial velocity and average fluid velocity in a packed bed?
  ক

  ϑ=φu

  খ

  ϑ=u/φ

  গ

  ϑ=φ0.14u

  ঘ

  ϑ=φ\(^\frac{\vartheta}{u}u\)
• If we have very small dp/di < 0.01, then we may use ____________
  ক

  Ergun Equation

  খ

  Kozeny Carman Equation

  গ

  Sieder Tate Equation

  ঘ

  Arrhenius Equation
• In the Ergun equation, what do you understand by the term X? f = ΔP/L X/ρ&vartheta;S2(∈3/(1-∈))
  ক

  Diameter of the tube

  খ

  Diameter of the pellets

  গ

  Effective diameter

  ঘ

  Equivalent diameter of the tube
• The Ergun equation is used to calculate the ___________
  ক

  Pressure drop in packed beds

  খ

  Reynolds number in packed columns

  গ

  Overall heat transfer coefficients

  ঘ

  Number of particles
• The pressure drop in a packed bed is _______ for a given length.
  ক

  Constant

  খ

  Exponentially Increasing

  গ

  Parabolically Increasing

  ঘ

  Linearly Increasing
• The Velocity profile in a packed bed reactor is__________
  ক

  Fully parabolic

  খ

  Parabolic near the walls

  গ

  Flat at the centre

  ঘ

  Concave downward near the walls and upward at the centre
• The Temperature profile in a packed bed reactor surrounded by a cooling liquid is__________
  ক

  Fully parabolic

  খ

  Parabolic near the walls

  গ

  Flat at the centre

  ঘ

  Concave downward near the walls and upward at the centre
• In a Packed Bed Shell and Tube HE, the pellets are usually kept _______
  ক

  At Tube Side

  খ

  At Shell side

  গ

  At any side as required

  ঘ

  At floor of the shell
• As an Indirect contact HE, Packed beds have _______ fluid flow.
  ক

  Continuous

  খ

  Constant

  গ

  Intermittent

  ঘ

  Reversing
• For an Exothermic Reaction, which of the following operation is best suited to support the reaction?
  ক

  Shell and tube with hot fluid in shell and packed bed in tube

  খ

  Shell and tube with cold fluid in shell and packed bed in tube

  গ

  Shell and tube with hot fluid in tube and packed bed in shell

  ঘ

  Shell and tube with cold fluid in tube and packed bed in shell
• For an Endothermic Reaction, which of the following operation is best suited to support the reaction?
  ক

  Shell and tube with hot fluid in shell and packed bed in tube

  খ

  Shell and tube with cold fluid in shell and packed bed in tube

  গ

  Shell and tube with hot fluid in tube and packed bed in shell

  ঘ

  Shell and tube with cold fluid in tube and packed bed in shell
• Which of the following is not a valid operation of packed bed reactors?
  ক

  Shell and Tube Setup

  খ

  Indirect contact setup

  গ

  Feedwater heater

  ঘ

  Direct Contact setup
• Why are Packed bed Heat Exchangers Direct contact type heat exchangers?
  ক

  Because they create heavy mixing

  খ

  Uses two fluids to transfer heat by dissolving into each other

  গ

  Gas liquid system where they are brought to direct contact

  ঘ

  Gas-Gas system where they are brought to direct contact