51. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.
52. In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.
53. In perforated plate towers, the
54. A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator
55. Joint efficiency (J) for a seamless pipe is
56. The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)
57. The main purpose of providing stepping on the trays is to
58. Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is
59. Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.
60. Flanges are connected to pipes by
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