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Mechanical Operations

Mechanical Operations
Optimum ratio of operating speed to critical speed of a trommel is

0.5-2
1.5-2.5
1.33-1.45
0.33-0.45

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Mechanical Operations
Ribbon blenders are exclusively meant for

Continuous mixing
Non-flowing powder and thin pastes
Blending miscible liquids
Bath mixing

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Mechanical Operations
For benefication of iron ore, the most commonly used method is

Froth floatation
None of these
Jigging & tabling
Flocculation

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Mechanical Operations
For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?

None of these
Leva
Kozney-Karman equation
Blake-Plummer equation

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Mechanical Operations
In case of a plate and frame filter press, filtrate flow through the cake follows __________ flow.

Plug
Laminar
Turbulent
None of these

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Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 W.Dr.ρ
3.6 V.W. ρ
3.6 V.W.Dr.ρ
3.6 V.W.Dr/ρ

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