37. Which of the following is used for very accurate measurement of flow of gas at low velocity?

40. Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.

41. Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

42. A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below :

Δ P/L = 375 x 10

If water is to be used as the fluidising medium, the minimum fluidisation velocity, V

Δ P/L = 375 x 10

^{3}V_{OM}+ 10.94 x 10^{6}V^{2}_{OM}(SI units)If water is to be used as the fluidising medium, the minimum fluidisation velocity, V

_{OM}isPage **6** of **97**