Sand Filters MCQ

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

• Calculate the amount of sand required for the following data. Flow: 200 m3/h Velocity of dual media filter: 15m/h Height: 0.4 m
  ক

  12668 Kg

  খ

  9237 Kg

  গ

  1020 Kg

  ঘ

  12752 Kg
• Calculate the amount of pebbles required for the following data. Flow: 200 m3/h Velocity of dual media filter: 15m/h Height: 0.6 m
  ক

  12668 Kg

  খ

  13792 Kg

  গ

  35000 Kg

  ঘ

  15792 Kg
• What is the bulk density of sand assumed while designing the amount required for a sand filter?
  ক

  1750 Kg/m3

  খ

  1300 Kg/m3

  গ

  1000Kg/m3

  ঘ

  790 Kg/m3
• What is the bulk density of pebbles assumed while designing a Pressure sand filter?
  ক

  1650 kg/m3

  খ

  1600 kg/m3

  গ

  650 kg/m3

  ঘ

  550 kg/m3
• Calculate the flow rate of the backwash pump to be used for a multimedia filter with the following data. Flowrate: 2200 m3/h Rise velocity of multimedia filter: 18 m/h
  ক

  3700 m3/ h

  খ

  2900 m3/ h

  গ

  5300 m3/ h

  ঘ

  3800 m3/ h
• Calculate the flow rate of the backwash pump to be used for a pressure sand filter with the following data. Flowrate: 2200 m3/h Rise velocity of PSF (Pressure Sand filter): 10 m/h
  ক

  4500 m3/ h

  খ

  5280 m3/ h

  গ

  6480 m3/ h

  ঘ

  7580 m3/ h
• Calculate the flow rate of the backwash pump to be used for a dual media filter with the following data. Flowrate: 2200 m3/h Rise velocity of DMF: 15 m/h
  ক

  4500 m3/ h

  খ

  3520 m3/ h

  গ

  3750 m3/ h

  ঘ

  4920 m3/ h
• While designing a pump for backwash for a filter what will be the velocity assumed?
  ক

  24 m/h

  খ

  36m/h

  গ

  30 m/h

  ঘ

  20 m/h
• While designing a blower for backwash for multimedia filters with air scouring what is the velocity considered?
  ক

  36 m/h

  খ

  30 m/h

  গ

  24 m/h

  ঘ

  20 m/h
• While designing a blower for backwash for multimedia filters without air scouring what is the velocity considered?
  ক

  36 m/h

  খ

  30 m/h

  গ

  24 m/h

  ঘ

  20 m/h
• While designing a blower for backwash for dual media filters without air scouring what is the velocity considered?
  ক

  36 m/h

  খ

  30 m/h

  গ

  24 m/h

  ঘ

  20 m/h
• While designing a blower for backwash for sand filters with air scouring what is the velocity considered?
  ক

  36 m/h

  খ

  30 m/h

  গ

  24 m/h

  ঘ

  20 m/h
• While designing a blower for backwash for sand filters without air scouring what is the velocity considered?
  ক

  36 m/h

  খ

  30 m/h

  গ

  24 m/h

  ঘ

  20 m/h
• Calculate the diameter of a multimedia filter with the following data. Flow: 2200 m3/hr Velocity: 18 m/hr
  ক

  13.3 m

  খ

  14.5 m

  গ

  12.5 m

  ঘ

  12.9 m
• Calculate the diameter of a dual media filter with the following data. Flow: 2200 m3/hr Velocity: 15 m/hr
  ক

  15.5 m

  খ

  13.6 m

  গ

  13.9 m

  ঘ

  16.5 m
• Calculate the diameter of a sand filter with the following data. Flow: 2200 m3/hr Velocity: 12 m/hr
  ক

  15.3 m

  খ

  15.5 m

  গ

  16.3 m

  ঘ

  16.5 m
• While designing a multimedia filter what is the velocity that is assumed?
  ক

  10-12 m/h

  খ

  15-18 m/h

  গ

  18-20 m/h

  ঘ

  30 m/h
• While designing a dual media filter what is the velocity that is assumed?
  ক

  10-12 m/h

  খ

  15-18 m/h

  গ

  20 m/h

  ঘ

  30 m/h
• While designing a sand filter what is the velocity that is assumed?
  ক

  10-12 m/h

  খ

  15 m/h

  গ

  20 m/h

  ঘ

  30 m/h
• What is the TSS at the outlet of the Pressure Sand Filter (PSF)?
  ক

  <10 ppm

  খ

  25 ppm

  গ

  100 ppm

  ঘ

  >150 ppm
• What does sand filter remove?
  ক

  TDS

  খ

  TSS

  গ

  BOD

  ঘ

  COD
• What is the depth of washing during high-rate water backwash?
  ক

  3-4 mm

  খ

  3-6 mm

  গ

  2-3 mm

  ঘ

  1-2 mm
• What is the air scour rate which is provided before a water backwash?
  ক

  12 cum/ sqm h

  খ

  15 cum/ sqm h

  গ

  20 cum/ sqm h

  ঘ

  27 cum/ sqm h
• Even by high-rate of backwash, efficiency of cleaning is poor.
  ক

  True

  খ

  False
• What is the porosity range during expansion of the filter bed?
  ক

  0.4-0.5

  খ

  0.5-0.6

  গ

  0.1-0.2

  ঘ

  0.68-0.7
• What is the surface wash rate?
  ক

  5-6 cum/sqm h

  খ

  6-7 cum/sqm h

  গ

  8-10 cum/sqm h

  ঘ

  10-12 cum/sqm h
• What is the head loss found in a rapid sand filter?
  ক

  <3

  খ

  >3

  গ

  0

  ঘ

  <4
• What is the effective size of sand used in rapid sand filters?
  ক

  0.2-0.3 mm

  খ

  0.3-0.6 mm

  গ

  0.6-1.2 mm

  ঘ

  12-2.4 mm
• What is the percentage of bacterial removal in filter beds?
  ক

  60-70 %

  খ

  75-80 %

  গ

  80-90 %

  ঘ

  90-99 %
• Pre-treatment of beds is not necessary.
  ক

  True

  খ

  False