Answer / atul $onawane

electromagnetic flow meter works on the principle of fadays
law of induction. in this voltage induced in the conductor is
proportional to the velocity of fluid(conducting). only
conducting fluids and gases are used .

Answer / rajesh l parmar

Electromagnetic flow meter works on a principal of
faraday’s law or electromagnetic induction which states
that when a current carrying coinductor moves through a
stationary traverse magnetic field, then e.m.f. is induced
between the ends of the conductor and this e.m.f. is
proportional to relative velocity between conductor and
magnetic field

E = BLV where

B = magnetic induction

L = length of a conductor

V = velocity of the conductor relative to the magnetic
field

It consists of a flow tube inside a pipe which carries a
fluid flow. So when the fluid is passed through the flow
tube, it is visualized as a current carrying conductor
having a length equal to inside diameter of the flow tube.

Now the gas, steam and oils are having low electrical
conductance. So no E.M.F. can be generated in such case. So
electromagnetic flow meters can not be used for metering
gas, oil and steam.

In general electromagnetic flow meters can only be used to
measure the flow of fluid which are sufficient conductive
to generate e.m.f.

Answer / rajesh l parmar

Electromagnetic flow meter works on a principal of
faraday’s law or electromagnetic induction which states
that when a current carrying coinductor moves through a
stationary traverse magnetic field, then e.m.f. is induced
between the ends of the conductor and this e.m.f. is
proportional to relative velocity between conductor and
magnetic field

E = BLV where

B = magnetic induction

L = length of a conductor

V = velocity of the conductor relative to the magnetic
field

It consists of a flow tube inside a pipe which carries a
fluid flow. So when the fluid is passed through the flow
tube, it is visualized as a current carrying conductor
having a length equal to inside diameter of the flow tube.

Now the gas, steam and oils are having low electrical
conductance. So no E.M.F. can be generated in such case. So
electromagnetic flow meters can not be used for metering
gas, oil and steam.

In general electromagnetic flow meters can only be used to
measure the flow of fluid which are sufficient conductive
to generate e.m.f.

Answer / m n gopinath

electromagnetic meters are generally used with conductive
liquids having conductivity greater than 50 microsiemens/cm.

DM Water, gases,steams and hydrocarbons are non conductive,
hence cannot be used.

..however it can be used in acid or alkali services

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Specific Heat of Bagasse at 50% moisture, 40% moisture and 25% moisture?

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Question 77 - The molecular weights M in kg / mol of 3 different monomers a, b and c in a polymer are Ma = 14, Mb = 16 and Mc = 18, with their respective quantities in N units having the ratio of Na : Nb : Nc = 2 : 3 : 5. (a) Find the numerical average molecular weight of the polymer by using the formula (Ma Na + Mb Nb + Mc Nc) / (Na + Nb + Nc). (b) Find the weighted average molecular weight of the polymer by using the formula (Ma Na Ma + Mb Nb Mb + Mc Nc Mc) / (Ma Na + Mb Nb + Mc Nc). (c) Calculate the polydispersity Q by using the answer in (b) divided by answer in (a). (d) Find the volumetric average molecular weight of the polymer by using the formula (Ma Na Ma Ma + Mb Nb Mb Mb + Mc Nc Mc Mc) / (Ma Na Ma + Mb Nb Mb + Mc Nc Mc). (e) Estimate the polydispersity Q by using the answer in (d) divided by answer in (b).

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1 Answers  

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Question 92 - (a) In order to determine the slurry volume (L) in chromatography, arrange the formula using the following parameters : slurry concentration (%), slurry volume (L), settled chromatography medium volume (L), 100. (b) In order to determine the chromatography medium volume (L) in gel filtration chromatography, arrange the formula using the following parameters : sample volume to be processed (L), chromatography medium volume (L), sample volume in percent of total column volume (%), 100.

1 Answers  

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