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- Question
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan
Options- A. with greater number of blades.
- B. of increased diameter.
- C. both (a) & (b).
- D. neither (a) nor (b).
- Correct Answer
- both (a) & (b).
- 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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