Mechanical Operations

11. _________ is a cohesive solid.

1. Wheat
2. Sand
3. Wet clay
4. None of these

View answer

12. _________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.

1. Separation efficiency
2. Selectivity index
3. Concentration ratio
4. None of these

View answer

13. _________ is the most commonly used 'filter aid'.

1. Diatomaceous earth
2. Fuller's earth
3. Vermiculite
4. Semi-plastic clay

View answer

14. _________ is the most suitable for compounding rubber and plastic solids.

1. Banbury mixer
2. Pan mixer
3. Pug mill
4. Charge can mixer

View answer

15. _________ is used for producing a thick suspension from a thin slurry.

1. Cartridge filter
2. Rotary drum vacuum filter
3. Pressure filter thickener
4. Plate and frame filter press

View answer

16. _________ mean diameter of particles is given by Σ (xi/Dpi ⃗)

1. Mass
2. Volume
3. Arithmetic
4. Volume surface

View answer

17. _________ mill is normally used for grinding of talc.

1. Tube
2. Compartment
3. Ring-roll
4. Pebble

View answer

18. _________ mill is not a revolving mill.

1. Pebble
2. Compartment
3. Cage
4. Tube

View answer

19. _________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.

1. Buhrstone
2. Roller
3. Attrition
4. Pebble

View answer

20. _________ mills are termed as disintegrators.

1. Cage
2. Compartment
3. Pebble
4. All tumbling

View answer