Cyclone Separators - 2 MCQ

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• What is the best way to obtain a high efficiency of removal from cyclones?
  ক

  Have a high pressure drop

  খ

  Use one huge cyclone

  গ

  Use n number of small cyclones in parallel

  ঘ

  Have a high centrifugal force
• What is the most common use of through-flow type cyclones?
  ক

  To remove fumes

  খ

  To remove fly ash

  গ

  To remove PM2.5

  ঘ

  To remove mist
• What is an advantage of the impeller collector cyclone?
  ক

  Low space requirement

  খ

  Low pressure drop

  গ

  Low maintenance

  ঘ

  Low resource requirement
• What is a huge advantage of the through-flow cyclone?
  ক

  Lower maintenance

  খ

  Lower space requirement

  গ

  Fc < g

  ঘ

  Low pressure drop
• How does the through-flow type cyclone vary from the reverse flow type cyclone?
  ক

  In the former, the pressure drop is high

  খ

  In the latter, the gas leaves from the bottom

  গ

  In the former, the gas leaves from the bottom

  ঘ

  In the former, the flow rates are higher
• Which of the following factors is the pressure drop in a cyclone proportional to?
  ক

  Inlet velocity

  খ

  Square of inlet velocity

  গ

  Cyclone dimensions

  ঘ

  Square of the cyclone dimensions
• Which of the following is the efficiency range with which a high-efficiency cyclone captures a particle size of 15 microns? (Cyclone has generalised design)
  ক

  30-50

  খ

  50-80

  গ

  80-95

  ঘ

  95-99
• What is the efficiency of a conventional cyclone for a particle size smaller than 5 microns?
  ক

  50-80%

  খ

  Greater than 50%

  গ

  50%

  ঘ

  Less than 50%
• Why does the pressure drop need to be calculated for the cyclone along with its efficiency?
  ক

  To determine the load

  খ

  To determine cut size diameter

  গ

  To estimate costs

  ঘ

  To avoid explosions
• Which of the following is false about cut size diameter, dpc?
  ক

  Particles larger dpc have a collection efficiency lower than 50%

  খ

  Particles larger dpc have a higher collection efficiency greater than dpc

  গ

  dpc is the particle size collected with 50%

  ঘ

  Particles larger dpc have a collection efficiency greater than 50%
• What is meant by ‘cut size diameter’?
  ক

  The size of the particle collected with 25% efficiency

  খ

  The size of the particle collected with 75% efficiency

  গ

  The size of the particle collected with 100% efficiency

  ঘ

  The size of the particle collected with 50% efficiency
• For a cyclone, which of the following factors increases with increasing particle size and a small area of cross-section?
  ক

  Tangential velocity

  খ

  Cut diameter

  গ

  Collection efficiency

  ঘ

  Effective number of terms
• What is the default effective number of turns a gas makes in the cyclone?
  ক

  3

  খ

  6

  গ

  18

  ঘ

  Cannot be determined
• What is the relative velocity between the gas and particulates in the cyclone equal to?
  ক

  Radial velocity

  খ

  Gravitational force

  গ

  Separation factor

  ঘ

  Tangential velocity