61. Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.
62. Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
63. Float and sink test determines the possibility of cleaning of coal by a process based on the
64. Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?
65. Wet seiving is employed, when the product contains __________ materials.
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