Which of the following is the hardest material ?

Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.

Use of 'grinding aids' is done in __________ grinding.

Separation of materials of the same density based on their sizes by using then-different rates of flow is called

In case of grinding in a ball mill

__________ is used for producing a thick suspension from a thin slurry.

Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?

Gyratory crushers compared to the reciprocating jaw crushers

Separation of isotopes is generally done using a/an __________ centrifuge.

General mechanism of size reduction in intermediate and fine grinder is by

Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a

The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)

Wet seiving is employed, when the product contains __________ materials.

Tank filter (e.g., Nutsch filter) is

The important dimensional group involved in the power requirement calculation in mixing operation is the __________ number.

Temperature of the product during ultrafine grinding

A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.

Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?

In case of a revolving mill, wet grinding compared to dry grinding

Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are

Crushing efficiency of a machine ranges between __________ percent.

Reciprocating screens are normally inclined at an angle ofwith the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the

The work index in Bond's law for crushing of solids has the following dimensions

All resistances during washing of cake

For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

About 2-3 hp, power per gallon of a thin liquid provides vigrous agitation in an agitator. 'Power number' in agitation is given by

Sauter mean diameter is the same as the __________ mean diameter.

The material is crushed in a gyratory crusher by the action of

Which of the following gives the crushing energy required to create new surface ?

In filtration, the use of 'filter aid' helps in

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:
P_o = ρ/ρN³ D⁵ : Power number
Re = ρ N D²/μ: Reynold's number
N is the impeller rotational speed, and D is the impeller diameter.

Pick out the material having minimum Rittinger's number.

Pine oil and cresylic acid are used as __________ in the froth floatation process.

Gizzlies are used for separating __________ solids.

Ore concentration by jigging is based on the difference in the __________ of the particles.

Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?

Sedimentation on commercial scale occurs in

For raschig rings, the sphericity is

__________ mills are termed as impactors.

Grinding characteristic of a material is given by its

The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

__________ baffles are provided in ball mills.

During filtration operation, the filtrate encounters the resistance of the

Which of the following clay mixing devices is vacuum operated for deairation of clay?

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

A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

Size measurement of ultrafine particles can be best expressed in terms of

Rittinger's crushing law states that

With increase in drum speed, in a rotary drum filter, the filtration rate