Q.1
Jigging is a technique by which different particles can be
Q.2
Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.
Q.3
Pick out the correct statement.
Q.4
Wheat is ground into flour in a
Q.5
Which is a secondary crusher for a hard & tough stone?
Q.6
To get a fine talc powder from its granules, the equipment used is
Q.7
Removal of activated carbon from glycerine is done by
Q.8
Pick out the wrong statement:
Q.9
__________ mills fall in the category of tumbling mills,
Q.10
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the
Q.11
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is
Q.12
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.
Q.13
For classification of potable (drinking) water, we use a __________ filter.
Q.14
Which of the following is not an ultrafine grinder (colloid mill)?
Q.15
Which of the following comes in the category of primary crusher for hard and tough stone?
Q.16
Choke crushing (in case of a Jaw crusher) compared to free crushing
Q.17
For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.
Q.18
Stamp mills are generally used for crushing
Q.19
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?
Q.20
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?
Q.21
A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.
Q.22
Balls for ball mills are never made of
Q.23
Which of the following may prove unsuitable for filtering volatile liquids?
Q.24
Which is the most suitable conveyor for transportation of sticky material?
Q.25
Filtration should be stopped in a filter press, if the
Q.26
To remove very small amount of tiny solid impurities from liquid, we use a
Q.27
A belt conveyor used for the transportation of materials can
Q.28
Sphericity of pulverised coal is
Q.29
The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.
Q.30
For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to
Q.31
Xanthates are used in the froth floatation process as a/an
Q.32
Use of grinding aids results in the
Q.33
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?
Q.34
The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a
Q.35
Cement clinker is reduced to fine size by a
Q.36
The speed of a rotary drum vacuum filter may be about __________ rpm.
Q.37
To remove dirt from the flowing fluid, we use a
Q.38
Highly viscous liquids & pastes are agitated by
Q.39
The process by which fine solids is removed from liquids is termed as
Q.40
The mechanism of size reduction by a hammer mill is by impact and attrition between the
Q.41
Dispersion of a gas through liquid is done by using a
Q.42
Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.
Q.43
Pick out the wrong statement.
Q.44
The unit of specific cake resistance is
Q.45
Reciprocal of sphericity is termed as the
Q.46
Rod mills employed for grinding
Q.47
Ultra centrifuges are used for the separation of __________ solid particles.
Q.48
The term 'angle of nip' is concerned with the operation of the __________ crushers.
Q.49
There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.
Q.50
Which of the following gives the crushing energy required to create new surface ?
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