Related Questions

The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
A 0.2 to 0.4
B 0.4 to 1.0
C 2 to 4
D 5 to 7
The effective size of sand particles used in slow sand filters is
A 0.25 to 0.35 mm
B 0.35 to 0.60 mm
C 0.60 to 1.00 mm
D 1.00 to 1.80 mm
Insufficient washing of sand grains in a rapid sand filter causes
A Air binding
B Shrinkage of filtering media
C Mud balls
D Expansion of filtering media
Cartridge filters are termed as 'edge' filters, because of the fact that the
A Disks have very sharp edge
B Solids are not deposited at the edge of the disk
C Bulk of the solids are removed at the periphery of the disks
D None of these
Eclipses occur due to which optical phenomena?
A Reflection
B Refraction
C Rectilinear propagation
D Diffraction
In water treatment, rapid gravity filters are adopted to remove
A Dissolved organic substances
B Dissolved solids and dissolved gases
C Floating solids and dissolved inorganic solids
D Bacteria and colloidal solids
Find out which quotation parts of the following sentences has an error. If one 'wants' to keep up with the rapid advances in the rapid advances in work place 'technology' 'they' must plan 'to take' frequent refresher courses.
A wants
B technology
C they
D to take
The property of sand due to which the sand grains stick together is called
A Collapsibility
B Permeability
C Cohesiveness
D Adhesiveness
Period of cleaning of slow sand filters is about
A 24 - 48 hours
B 10 - 12 days
C 2 - 3 months
D 1 - 2 year
The rate of filtration in slow sand filters in million litres per day per hectare is about
A 50 to 60
B 100 to 150
C 500 to 600
D 1400 to 1500

Next steps