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- Question
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
Options- A. neutralised by alkali treatment.
- B. left as such without any treatment.
- C. diluted with fresh water to reduce its acidity.
- D. none of these.
- Correct Answer
- neutralised by alkali treatment.
- 1. Instrumentation in a plant offers the advantage of
Options- A. greater safety of operation
- B. better quality of product
- C. greater operation economy
- D. all (a), (b) and (c) Discuss
- 2. Pick out the wrong statement.
Options- A. Heat capacity of a diatomic gas is higher than that of a monoatomic gas.
- B. Equal volumes of Argon and Krypton contain equal number of atoms.
- C. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023.
- D. The binary mixture of a particular com-positidn in both vapor and liquid state is known as an azeotropic mixture Discuss
- 3. Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the
Options- A. electrical insulation purpose.
- B. tanning of leather.
- C. strengthening of plaster of paris.
- D. decorative laminates. Discuss
- 4. Rittinger's crushing law states that
Options- A. work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product.
- B. work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product.
- C. work required in crushing is proportional to the new surface created.
- D. for a given machine and feed, crushing efficiency is dependent on the size of the feed & product. Discuss
- 5. Magnesite refractories have low resistance to
Options- A. attack by basic slag.
- B. abrasion.
- C. disintegration on sudden change of temperature.
- D. both (b) and (c). Discuss
- 6. Pick out the wrong statement.
Options- A. LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals.
- B. The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
- C. Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas.
- D. Maximum yield of naphthalene is obtained on distillation of crude oil. Discuss
- 7. In chemical process equipments, the conical bottom heads used, usually has an apex angle of
Options- A. 20°
- B. 40°
- C. 60°
- D. 80° Discuss
- 8. Operating condition in the electrical dehydrators for crude oil is about
Options- A. 6.5 kgf/Cm2 & 95°C.
- B. 1 atm. & 110 °C.
- C. 20 kgf/cm2 & 110°C.
- D. 50 atm. and 150°C. Discuss
- 9. Radioactive decay follows __________ order kinetics.
Options- A. first
- B. second
- C. third
- D. zero. Discuss
- 10. Pick out the correct statement:
Options- A. Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.
- B. The operating cost of shaking screen is more than that of a vibrating screen.
- C. Screen capacity does not depend upon the specific gravity of the minerals.
- D. Asphalt is best crushed using toothed roll crusher. Discuss
More questions
Correct Answer: all (a), (b) and (c)
Correct Answer: Equal volumes of Argon and Krypton contain equal number of atoms.
Correct Answer: strengthening of plaster of paris.
Correct Answer: work required in crushing is proportional to the new surface created.
Correct Answer: both (b) and (c).
Correct Answer: The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
Correct Answer: 60°
Correct Answer: 6.5 kgf/Cm2 & 95°C.
Correct Answer: first
Correct Answer: Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.
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