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Heat Transfer Operations
Heat Transfer Operations Multiple Choice
Quiz 1
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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
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