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- Question
Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?
Options- A. Firebricks
- B. Silica bricks
- C. Silicon carbide bricks
- D. Sillimanite
- Correct Answer
- Silica bricks
- 1. 5-10-5 fertilisers mean that they contain
Options- A. 5, 10, 5% respectively of N2, P2O5 and K2O.
- B. only 5 to 10% active fertiliser constituents.
- C. 5 to 10% filler & carrier of soil conditioners.
- D. none of these. Discuss
- 2. Uranium is recovered from its ore (pitchblende) by
Options- A. froth floatation technique.
- B. leaching with sulphuric acid.
- C. smelting in a furnace.
- D. dissolving in water. Discuss
- 3. One micron is equal to
Options- A. 10-4 mm
- B. 10-4 cm
- C. 10-6 m
- D. both(b)&(c) Discuss
- 4. Pick out the correct statement.
Options- A. Reaction of NH3 with HNO3 to produce (NH4)2NO3 is endothermic.
- B. With increase in NH3/CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate.
- C. Biuret (an intermediate during urea manufacture) is toxic to seeds and animals.
- D. both (b) and (c). Discuss
- 5. Use of grinding aids results in the
Options- A. enhanced production rate.
- B. finer products.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 6. Fundamental principle of refrigeration is based on the __________ law of thermodynamics.
Options- A. zeroth
- B. first
- C. second
- D. third Discuss
- 7. __________ of depreciation calculation accounts for the interest on investement.
Options- A. Straight line method
- B. Declining balance
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
- 8. Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of
Options- A. thermal cracking
- B. gum formation
- C. coking
- D. discoloration Discuss
- 9. Heat of neutralisation of HCl and NaOH is - 57.46 kJ/Kg mole. The heat of ionisation of water will be __________ kJ/Kg mole.
Options- A. 57.46
- B. -57.46
- C. 114.92
- D. -28.73 Discuss
- 10. Machinability of hard alloys and tool steels is improved by
Options- A. spherodising
- B. annealing
- C. tempering
- D. normalising Discuss
More questions
Correct Answer: 5, 10, 5% respectively of N2, P2O5 and K2O.
Correct Answer: leaching with sulphuric acid.
Correct Answer: both(b)&(c)
Correct Answer: With increase in NH3/CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate.
Correct Answer: neither (a) nor (b).
Correct Answer: second
Correct Answer: neither (a) nor (b).
Correct Answer: coking
Correct Answer: 57.46
Correct Answer: annealing
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