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- Question
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.
Options- A. 1.0
- B. 0.5
- C. 1.34
- D. 4.34
- Correct Answer
- 1.34
- 1. Waxy crudes are treated with chemical additives mainly to
Options- A. depress its pour point
- B. dissolve wax
- C. precipitate wax
- D. remove wax Discuss
- 2. Optimum ratio of operating speed to critical speed of a trommel is
Options- A. 0.33-0.45
- B. 1.33-1.45
- C. 0.5-2
- D. 1.5-2.5 Discuss
- 3. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively
Options- A. - 273° & 80°
- B. 0° & 80°
- C. 32° & 460°
- D. 32° & 80° Discuss
- 4. Plant tranquillisers
Options- A. hold back stem growth and halt plants at a desired height.
- B. cause early maturation of plants.
- C. accelerate ripening of food and grain.
- D. produce seedless fruit. Discuss
- 5. Depreciation
Options- A. costs (on annual basis) are constant when the straight line method is used for its determination.
- B. is the unavoidable loss in the value of the plant, equipment and materials with lapse in time.
- C. does figure in the calculation of income tax liability on cash flows from an investment.
- D. all (a), (b) and (c). Discuss
- 6. Number of gm moles of solute dissolved in one litre of a solution is called its
Options- A. equivalent weight
- B. molarity
- C. molality
- D. normality Discuss
- 7. Limestone is normally crushed in a
Options- A. roll crusher
- B. hammer crusher
- C. ball mill
- D. tube mill Discuss
- 8. Load cells are used for the measurement of
Options- A. stress
- B. weight
- C. strain
- D. velocity Discuss
- 9. One micron is equal to __________ cm.
Options- A. 10-2
- B. 10-4
- C. 10-6
- D. 10-8 Discuss
- 10. Separation of two or more components of a liquid solution can not be achieved by
Options- A. fractional crystallisation
- B. liquid extraction
- C. absorption
- D. evaporation Discuss
More questions
Correct Answer: depress its pour point
Correct Answer: 0.33-0.45
Correct Answer: 0° & 80°
Correct Answer: hold back stem growth and halt plants at a desired height.
Correct Answer: all (a), (b) and (c).
Correct Answer: molarity
Correct Answer: hammer crusher
Correct Answer: weight
Correct Answer: 10-4
Correct Answer: absorption
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