81. $$\frac{{{{\text{L}}_{\text{e}}}}}{{\text{D}}}$$ for 90° elbow (medium radius) and 90° square elbow would be respectively around
82. In a __________ rivetted joint, the rivets in the various rows are opposite to each other.
83. The units of Young's modulus of elasticity and __________ are the same.
84. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the
85. Tube height in a calendria type evaporator is normally less than __________ metres.
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