Discussion
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- Question
Polystyrene is a __________ plastic at room temperature.
Options- A. ductile
- B. brittle
- C. malleable
- D. none of these
- Correct Answer
- brittle
- 1. Segar cones are used for the determination of __________ of refractories.
Options- A. softening temperature
- B. spalling resistance
- C. electrical conductivity
- D. resistance to slag attack Discuss
- 2. Salt content (measured as sodium chloride) in electrically desalted crude oil comes down to a level of about __________ ptb (pounds per thousand barrel).
Options- A. 0.03
- B. 3
- C. 35
- D. 70 Discuss
- 3. Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a
Options- A. disc bowl centrifuge.
- B. sharpies supercentrifuge.
- C. batch basket centrifuge.
- D. sparkler filter. Discuss
- 4. Bourdon tube is never made of
Options- A. phosphor bronze
- B. monel metal
- C. stainless steel
- D. cast iron Discuss
- 5. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
Options- A. 1000 to 2000
- B. 3000 to 6000
- C. 6000 to 9000
- D. 10000 to 100000 Discuss
- 6. A fuel oil consists of 4 fractions A, B, C and D. Their molar compositions and vapour pressures are given below :
The vapour pressure of the fuel oil will be __________ mm Hg.
Options- A. 736
- B. 727.5
- C. 512
- D. 767.8 Discuss
- 7. Which of the following is not an important property of fuel oil/furnace oil?
Options- A. Sulphur content
- B. Viscosity
- C. Aniline point
- D. Flash point Discuss
- 8. Pick out the wrong statement.
Options- A. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen.
- B. Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures.
- C. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness.
- D. none of these. Discuss
- 9. Highest quality bitumen is produced from the __________ crude oil.
Options- A. paraffinic
- B. naphthenic
- C. intermediate
- D. mixed Discuss
- 10. Ozone is
Options- A. a primary pollutant.
- B. a secondary pollutant.
- C. impervious to ultra-violet rays.
- D. both (b) and (c) Discuss
More questions
Correct Answer: softening temperature
Correct Answer: 3
Correct Answer: disc bowl centrifuge.
Correct Answer: cast iron
Correct Answer: 10000 to 100000
Correct Answer: 736
Correct Answer: Aniline point
Correct Answer: none of these.
Correct Answer: naphthenic
Correct Answer: both (b) and (c)
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