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- Question
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
Options- A. biological oxygen pond.
- B. aerated lagoons.
- C. trickling filters.
- D. gravity separator having oil skimming devices.
- Correct Answer
- gravity separator having oil skimming devices.
- 1. Buna-S is also known as
Options- A. teflon
- B. PTFE
- C. SBR
- D. polycrylates Discuss
- 2. Viscosity of atmospheric air may be about __________ centipoise.
Options- A. 0.015
- B. 1.5
- C. 15
- D. 150 Discuss
- 3. Refined acetic acid storage vessel are made of
Options- A. copper
- B. aluminium
- C. high carbon steel
- D. nickel Discuss
- 4. Which is a basic refractory?
Options- A. Fireclay
- B. Silica
- C. Chrome magnesite
- D. None of these Discuss
- 5. Soaking pits are meant for heating steel
Options- A. ingots
- B. coils
- C. sheets
- D. slabs Discuss
- 6. Percentage of heavy water in ordinary water is around
Options- A. 0.015
- B. 7.54
- C. 0.71
- D. 32.97 Discuss
- 7. Density of low density polythene is about __________ gm/c.c.
Options- A. 0.38
- B. 0.56
- C. 0.81
- D. 0.91 Discuss
- 8. Rain coats are made of
Options- A. neoprene
- B. PVC
- C. polyurathane
- D. SBR Discuss
- 9. CaCO3 contains __________ percent of Ca by weight.
Options- A. 40
- B. 48
- C. 96
- D. 12 Discuss
- 10. Pick out the material having minimum Rittinger's number.
Options- A. Calcite
- B. Pyrite
- C. Quartz
- D. Galena Discuss
More questions
Correct Answer: SBR
Correct Answer: 0.015
Correct Answer: aluminium
Correct Answer: Chrome magnesite
Correct Answer: ingots
Correct Answer: 0.015
Correct Answer: 0.91
Correct Answer: PVC
Correct Answer: 40
Correct Answer: Quartz
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