The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

Air binding phenomena in rapid sand filters occur due to

A

Excessive negative head

B

Mud ball formation

C

Higher turbidity in the effluent

D

Low temperature

The snippet that filters the filtered set is

A

var t=new FilteredSet(s, {function(s) {return !(x instanceof Set);});

B

var t=new FilteredSet{function(s) {return !(x instanceof Set);});

C

var t=new FilteredSet(s, {function(s) {return (x instanceof Set);});

D

var t=new FilteredSet(s, {function(s) {return x;});

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

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

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

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

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

The yield of a rapid gravity filter as compared to that of slow sand filter, is

A

10 times

B

15 times

C

20 times

D

30 times

The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

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