Explanation: The diameter assumed for hollow fine membranes for treating sea water is 95 microns. Du pont made the first hollow fine fibre. These membranes are self-supporting types.

Explanation: The permeate flux of the RO membrane UTC series is 0.8, BARC-TFC1 is 0.45, BARC-TFC2 is 0.55, NS-100 is 0.7, NS-200 is 0.8, NS-300 is 3.3, PA-300/RC-100 is 1 and CP is 0.06.

Explanation: The percentage of salt rejection for RO membrane NS-100 is 99 %, NS-200 is 99.8 %, NS-300 is 68 %, PES-1000 is 99.9 %, PA-300/RC-100 is 99.4 % and FT-30 is 99%.

Explanation: The cellulose acetate membranes get hydrolysed at extreme low/ high pH conditions. Cellulose acetate membranes are 100 microns thick. Modern membranes are blend acetate cellulose membranes.

Explanation: Polyamide membranes are used to make thin film composite membranes. These are available in hollow fibre sheets. These are also available in flat sheets.

Explanation: The pollutants which a hollow fibre sheet cannot handle is free chlorine. It causes irreversible damage to the fibre sheet. It affects the salt rejecting capacity.

Explanation: The concentration upto which these membranes withstand chlorine concentration is 1 ppm. These membranes do not require pretreatment. They are less expensive as maintenance is less.

Explanation: The diameter assumed for hollow fine membranes for treating brackish water is 85 microns. Du pont made the first hollow fine fibre. These membranes are self -supporting types.

Explanation: The membrane which exhibits very low flux is isotropic. These membranes exhibit high resistance to flow. Hence they have low flux.

Explanation: The membrane which exhibits very high flux is anisotropic. These membranes exhibit high salt rejection. These membranes have a very thin rejecting skin.

Explanation: The membrane which can be operated by turbulent flow is tubular type membrane. This reduces scaling and fouling. Thus this reduces the operation and maintenance cost.

Explanation: The hollow fibre membranes have asymmetric structure. These are produced as long capillary tubes. These do not require additional physical support.