Q.1
The Ergun equation is used to calculate the ___________
  • a) Pressure drop in packed beds
  • b) Reynolds number in packed columns
  • c) Overall heat transfer coefficients
  • d) Number of particles
Q.2
In the Ergun equation, what do you understand by the term X?
  • c) Effective diameter
  • a) Diameter of the tube
  • b) Diameter of the pellets
  • d) Equivalent diameter of the tube
Q.3
If we have very small dp/di < 0.then we may use ____________
  • a) Ergun Equation
  • b) Kozeny Carman Equation
  • c) Sieder Tate Equation
  • d) Arrhenius Equation
Q.4
What is the Reynolds number for the following setup?
  • a) 2.76×103
  • b) 2×105
  • c) 0.76×105
  • d) 2.76×105
Q.5
What is the friction factor for the given parameters for a non laminar packed bed setup?
  • a) 1.751
  • b) 1.740
  • c) 1.752
  • d) 1.749
Q.6
What is the pressure drop per unit length for the given parameters for a laminar packed bed setup?
  • a) -15.625Pa/m
  • b) -15.625KPa/m
  • c) -1.875Pa/m
  • d) -1.875KPa/m
Q.7
If we have a tube of diameter 30mm and particles of diameter 2mm, the length of the tube is 10cm and the number of pellets isThen what is the porosity?
  • a) 0.45
  • b) 0.95
  • c) 0.99
  • d) 0.65
Q.8
If we have a tube of diameter 30mm and particles of diameter 3mm, the length of the tube is 10cm and the number of pellets isThe flow rate is 5cm3/s, then what is the superficial velocity?
  • a) 0.5cm/s
  • b) 0.45cm/s
  • c) 0.7cm/s
  • d) 0.8cm/s
Q.9
In the Formula for porosity, what is the meaning of the term V?
  • a) Volume of Void
  • b) Volume of Pure Solid
  • c) Total Volume
  • d) Volume of the tube material
Q.10
Which one of the following is the correct expression for Friction Factor in Packed Bed Columns?
  • a) f = 150/Re
  • b) f = 150/Re+1.75
  • c) f = 180/Re+1.5
  • d) f = 100/Re+0.0035
Q.11
Calculate the pressure drop in the following setup.
  • a) 7Pa
  • b) 724×106Pa
  • c) 7×106Pa
  • d) 72atm
Q.12
A fully packed bed with small particle size has _________ pressure drop than a bed with larger particle size.
  • a) More
  • b) Less
  • c) Same
  • d) Negligible
Q.13
What is the term Ɵ in the Kozeny Carman equation for laminar flow in packed beds?
  • a) Surface Area of pellets
  • b) Sphericity of Pellets
  • c) Void fraction
  • d) Density
0 h : 0 m : 1 s