Q.1
Which new term is utilized for measuring non spherical particles?
  • a) Sphericity
  • b) Volume displacement
  • c) Geometry
  • d) None of the mentioned
Q.2
What are the methods for measuring large particles of size above 5mm?
  • a) Calliper
  • b) Micrometer
  • c) Sieves
  • d) All of the mentioned
Q.3
What are the methods used for measuring particles of size < 0.04mm?
  • a) Settling rate
  • b) Brownian movement
  • c) Sieve analysis
  • d) All of the mentioned
Q.4
What does ‘-‘ sign mean in the following expression: –+mesh particles?
  • a) Pass through 150
  • b) Doesnt pass through 150
  • c) Pass through 200
  • d) None of the mentioned
Q.5
What does ‘+’ sign mean in the following expression: –+mesh particles?
  • a) Pass through 200
  • b) Retained on 200
  • c) Retained on 150
  • d) None of the mentioned
Q.6
What is the relationship between sphericity and voidage?
  • a) Sphericity=(6(1-voidage))/(a*dp)
  • b) Voidage=(6(1-sphericity))/(a*dp)
  • c) Sphericity=(6*voidage)/(a*dp)
  • d) Voidage=(6*sphericity)/(a*dp)
Q.7
According to Brown, fractional voids in the packed bed are related to ___________ of particles?
  • a) Shape
  • b) Size
  • c) Sphericity
  • d) None of the mentioned
Q.8
The pressure drop through the fixed beds of uniformly sized solids has been correlated by ________
  • a) Ergun equation
  • b) Poisson equation
  • c) Laplace equation
  • d) None of the mentioned
Q.9
Which factor is considered in Ergun equation when the Reynolds number is less 20?
  • a) 150
  • b) 1.75
  • c) 2.75
  • d) 250
Q.10
Which factor is considered in Ergun equation when the Reynolds number is greater than 1000?
  • a) 150
  • b) 1.75
  • c) 2.75
  • d) 250
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