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- Question
Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).
Options- A. °API = 200(G - 1)
- B. °API = (141.5/G) - 131.5
- C. °API = (140/G) - 130
- D. °API = 145 - (145/G)
- Correct Answer
- °API = (141.5/G) - 131.5
- 1. Screw conveyors are
Options- A. run at very high rpm.
- B. suitable for sticky materials.
- C. suitable for highly abrasive materials.
- D. all (a), (b) and (c) Discuss
- 2. Low grade phosphate rock can be used in electrical furnace, because
Options- A. of the better CaO/SiO2 balance for slag formation.
- B. CaO content is less.
- C. it is cheap.
- D. it produces low cost product. Discuss
- 3. Wet grinding in a revolving mill __________ as compared to dry grinding.
Options- A. gives less wear on chamber walls
- B. requires more energy
- C. increases capacity
- D. complicates handling of the product Discuss
- 4. Enthalpy of formation of NH3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 ? N2 + 3H2, is equal to __________ kJ/kg. mole.
Options- A. 46
- B. 92
- C. -23
- D. -92 Discuss
- 5. Pick out the wrong statement.
Options- A. Lug supports are less expensive than other type of supports.
- B. A pipe is differentiated from a tube by the fact that a pipe has a greater wall thickness compared to the tube.
- C. A reducer is used to change the direction of a pipe in a straight run.
- D. The method of fixing tubes to a tube sheet by expanding is called 'tube rolling'. Discuss
- 6. Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the
Options- A. sensible heat differences are small, because the temperature changes from tray to tray is small.
- B. Trouton's rule is applicable.
- C. liquid/vapor loading across the column remains constant.
- D. all (a), (b) and (c). Discuss
- 7. Factory manufacturing cost is the sum of the direct production cost
Options- A. fixed charges and plant overhead cost.
- B. and plant overhead cost.
- C. plant overhead cost and administrative expenses.
- D. none of these. Discuss
- 8. __________ is the determining factor for the number of bubble caps to be used per tray.
Options- A. Permissible slot velocity
- B. Tray diameter
- C. Liquid load
- D. Vapor load Discuss
- 9. During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH3 to NO is about __________ percent.
Options- A. 38
- B. 68
- C. 82
- D. 98 Discuss
- 10. Hold up of material in a operating rotary drier is in the range of
Options- A. 0.05 to 0.15
- B. 0.25 to 0.50
- C. 0.5 to 0.8
- D. 0.8 to 0.9 Discuss
More questions
Correct Answer: suitable for sticky materials.
Correct Answer: of the better CaO/SiO2 balance for slag formation.
Correct Answer: increases capacity
Correct Answer: 92
Correct Answer: A reducer is used to change the direction of a pipe in a straight run.
Correct Answer: all (a), (b) and (c).
Correct Answer: fixed charges and plant overhead cost.
Correct Answer: Permissible slot velocity
Correct Answer: 98
Correct Answer: 0.05 to 0.15
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