81. Trommels are revolving screens which normally operate in the range of __________ rpm.
82. Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called
83. At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied:
Po = ρ/ρN3D5: Power number
Re = ρ ND2/μ: Reynold's number
N is the impeller rotational speed and D is the impeller diameter.
Po = ρ/ρN3D5: Power number
Re = ρ ND2/μ: Reynold's number
N is the impeller rotational speed and D is the impeller diameter.
84. The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
85. Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
86. Which of the following mechanical conveyors does not come under the division 'carriers'?
87. Which of the follwoing mechanical conveyors does not come under the division 'scrapers'?
88. In case of a revolving mill, wet grinding compared to dry grinding
89. Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is
90. Separation of isotopes is generally done using a/an __________ centrifuge.
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