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- Question
The energy required per unit mass to grind limestone particles of very large size to 100 ?m is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 ?rn is
Options- A. 6.35 kWh/ton
- B. 9.0 kWh/ton
- C. 18 kWh/ton
- D. 25.4 kWh/ton
- Correct Answer
- 18 kWh/ton
- 1. Soaking pits are meant for heating steel
Options- A. ingots
- B. coils
- C. sheets
- D. slabs Discuss
- 2. Percentage of heavy water in ordinary water is around
Options- A. 0.015
- B. 7.54
- C. 0.71
- D. 32.97 Discuss
- 3. Density of low density polythene is about __________ gm/c.c.
Options- A. 0.38
- B. 0.56
- C. 0.81
- D. 0.91 Discuss
- 4. Rain coats are made of
Options- A. neoprene
- B. PVC
- C. polyurathane
- D. SBR Discuss
- 5. CaCO3 contains __________ percent of Ca by weight.
Options- A. 40
- B. 48
- C. 96
- D. 12 Discuss
- 6. Pick out the material having minimum Rittinger's number.
Options- A. Calcite
- B. Pyrite
- C. Quartz
- D. Galena Discuss
- 7. Average molecular weight of air is about
Options- A. 21
- B. 29
- C. 23
- D. 79 Discuss
- 8. Both tritium and deuterium have the same number of
Options- A. neutrons
- B. electrons
- C. protons
- D. nucleons Discuss
- 9. °API gravity of water at N.T.P. is about
Options- A. 0
- B. 1
- C. 10
- D. 100 Discuss
- 10. Carbon Content by weight in air dried wood may be about __________ percent.
Options- A. 10
- B. 25
- C. 50
- D. 80 Discuss
More questions
Correct Answer: ingots
Correct Answer: 0.015
Correct Answer: 0.91
Correct Answer: PVC
Correct Answer: 40
Correct Answer: Quartz
Correct Answer: 29
Correct Answer: neutrons
Correct Answer: 10
Correct Answer: 50
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