41. The resistance wire used in a hot wire anemometer for conducting electrical current is made of
42. Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.
43. The Mach number for hypersonic flow of compressible fluid is
44. Which of the following is used for very accurate measurement of flow of gas at low velocity?
45. For laminar flow through a closed conduit
46. Shear stress in a fluid flowing in a round pipe
47. Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.
48. 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
49. 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 103 VOM + 10.94 x 106 V2OM (SI units)
If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is
Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units)
If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is
50. A venturimeter can not be used for the direct measurement of
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