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- Question
Length/diameter ratio of a ball mill is
Options- A. 1.5
- B. 1
- C. < 1
- D. > 1
- Correct Answer
- < 1
- 1. Make up water is required in a cooling tower to replace the water lost by
Options- A. evaporation
- B. drift
- C. blowdown and leakage
- D. all (a), (b) and (c) Discuss
- 2. With increase in the alumina content, the refractoriness of high alumina refractories
Options- A. increases
- B. decreases
- C. remains same
- D. may increase or decrease Discuss
- 3. Chromium molybdenum steel can not be welded using __________ welding.
Options- A. thermit
- B. electrical resistance
- C. oxy-acetylene
- D. any of these Discuss
- 4. Rayon is superior to cotton in making gauge for wound treatment, because rayon
Options- A. is a synthetic polymer.
- B. does not stick to the wound unlike cotton.
- C. can absorb over 90% of its own weight of water.
- D. both (b) and (c). Discuss
- 5. Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of
Options- A. calcium sulphate
- B. sodium chloride
- C. sodium sulphate
- D. magnesium chloride. Discuss
- 6. Dissolving a solute in a solvent does not change its
Options- A. specific heat
- B. vapour pressure
- C. viscosity
- D. none of these Discuss
- 7. Tabular bowl centrifuges as compared to disk bowl centrifuges
Options- A. operate at higher speed.
- B. employ bowl of larger diameter.
- C. can not be operated under pressure/vacuum.
- D. can't be used for separation of fine suspended solids from a liquid. Discuss
- 8. Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
Options- A. acrylic
- B. polyester
- C. nylon 6:6
- D. polypropylene Discuss
- 9. Reaction of orthophosphoric acid with soda ash produces
Options- A. sodium tripolyphosphate (STPP)
- B. tricresyl phosphate
- C. tributyl phosphate
- D. nitrophosphate Discuss
- 10. The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.
Options- A. 0.1-0.2
- B. 0.2-0.5
- C. 0.4-0.9
- D. 1.2-1.5 Discuss
More questions
Correct Answer: all (a), (b) and (c)
Correct Answer: increases
Correct Answer: electrical resistance
Correct Answer: does not stick to the wound unlike cotton.
Correct Answer: sodium chloride
Correct Answer: none of these
Correct Answer: operate at higher speed.
Correct Answer: acrylic
Correct Answer: sodium tripolyphosphate (STPP)
Correct Answer: 0.4-0.9
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