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

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Q. The reduction ratio for fine grinders is

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Q. Which of the following is the hardest material ?

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

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

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

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Q. In bag filters, filter fabrics are never made of

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

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Q. 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)

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

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Q. All resistances during washing of cake

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

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

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Q. Reduction ratio of crushers is the

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Q. Which is a secondary crusher for a hard & tough stone ?

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Q. Cyclones are used primarily for separating

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Q. There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.

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

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Q. Temperature of the product during ultrafine grinding

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Q. Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the

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