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

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

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

An alternator coupled to a _____ runs at slow speed, as compared to as compared to others.

A

diesel engine

B

hydraulic turbine

C

steam turbine

D

gas turbine

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

Toggle Filter আইকনটি-i. Remove filter হিসেবে কাজ করেii. Undo filter হিসেবে কাজ করে iii. Apply filter হিসেবে কাজ করেনিচের কোনটি সঠিক?

A

i ও ii

B

i ও iii

C

ii ও iii

D

i, ii ও iii

I have never seen such a slow coach like you, this small work has taken you three full months.-What does the idiom' a slow coach' mean?

A

an irresponsidle person

B

a careless person

C

an unthoughtful person

D

a very lazy person

I've never seen such a "Slow coach". Slow coach means ---

A

an irresponsible person

B

a careless person

C

a thoughtful person

D

a very lazy person

I've never seen such a "slow-coach" like you. Here "slow-coach" means ---

A

an irresponsible person

B

a careless person

C

a very lazy person

D

an unthoughtful person

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

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

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