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Molecular diffusivity (DAB) of water vapour in air is 2.6×10-5 m2 s-1 over an effective distance of 3 mm

Molecular diffusivity (DAB) of water vapour in air is 2.6×10-5 m2 s-1 over an effective distance of 3 mm

Q. Molecular diffusivity (DAB) of water vapour in air is 2.6×10-5 m2 s-1 over an effective distance of 3 mm. Density and coefficient of viscosity of air are 1.2 kg m-3 and 2×10-5 kg m-1 s-1,   respectively.   Sherwood   Number (NSh) for   water   vapour in   air is  . Ans: 1.00 to 1.00

Molecular diffusivity (DAB) of water vapour in air is 2.6×10-5 m2 s-1 over an effective distance of 3 mm Read More »

The porosity and compressibility of a 7.8 m thick confined aquifer are 0.25 and 1×10-8 m2 N-1, respectively

The porosity and compressibility of a 7.8 m thick confined aquifer are 0.25 and 1×10-8 m2 N-1, respectively

Q. The porosity and compressibility of a 7.8 m thick confined aquifer are 0.25 and 1×10-8 m2 N-1, respectively. The storage coefficient of the aquifer is 6.5×10-4. To release 650 m3 of water from 1 km2 of this aquifer, the average decline in hydraulic head will be m. Ans: 1.00 to 1.00

The porosity and compressibility of a 7.8 m thick confined aquifer are 0.25 and 1×10-8 m2 N-1, respectively Read More »

A self-propelled power reaper with a 1.2 m wide cutter bar was operated at a forward speed of 4 km h-1

A self-propelled power reaper with a 1.2 m wide cutter bar was operated at a forward speed of 4 km h-1

Q. A self-propelled power reaper with a 1.2 m wide cutter bar was operated at a forward speed of 4 km h-1. Turning loss during operation was observed to be 25 minutes per hectare. Neglecting any other losses, the field efficiency of the reaper will be                                          %. Ans: 83.00 to 84.00

A self-propelled power reaper with a 1.2 m wide cutter bar was operated at a forward speed of 4 km h-1 Read More »

Which one of the following chemicals is NOT used for fumigation in either horizontal or vertical storage structures to kill insects?

Which one of the following chemicals is NOT used for fumigation in either horizontal or vertical storage structures to kill insects?

Q. Which one of the following chemicals is NOT used for fumigation in either horizontal or vertical storage structures to kill insects? (A) Methyl bromide                                       (B) Phosphine (C) Phostoxin                                                 (D) Silver sulphate Ans: Silver sulphate

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In refining of the rice bran oil for edible purpose neutralization process is carried out mainly to remove

In refining of the rice bran oil for edible purpose neutralization process is carried out mainly to remove

Q. In refining of the rice bran oil for edible purpose, neutralization process is carried out mainly to remove (A) wax and organic impurities                     (B) gums and mucilage (C) saturated glycerides                                 (D) free fatty acids Ans: free fatty acids

In refining of the rice bran oil for edible purpose neutralization process is carried out mainly to remove Read More »

One of the key assumptions made by Dupuit-Forchheimer about the flow behavior in the porous

One of the key assumptions made by Dupuit-Forchheimer about the flow behavior in the porous

Q. One of the key assumptions made by Dupuit-Forchheimer about the flow behavior in the porous medium towards subsurface drains is (A) homogeneous medium                            (B) isotropic medium (C) horizontal streamlines                              (D) uniform recharge Ans: horizontal streamlines

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