## 71. The critical speed of a trommel (N) is related to its dia (D) as

## 72. Cartridge filters are termed as 'edge' filters, because of the fact that the

## 73. Two particles are called to be equal settling, if they are having the same.

## 74. If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

## 75. The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m^{2}, V = rising velocity of fluid, m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids, kg/m^{3})

^{2}, V = rising velocity of fluid, m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids, kg/m

^{3})

## 76. The specific surface of sherical particles is proportional to (where, D_{p} = diameter of particle).

_{p}= diameter of particle).

## 77. Wet grinding in a revolving mill __________ as compared to dry grinding.

## 78. Trommels employ __________ for screening of materials.

## 79. Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

## 80. increasing the capacity of a screen __________ the screen effectiveness.

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