Discussion
Home ‣ Chemical Engineering ‣ Mechanical Operations See What Others Are Saying!
- Question
Work index is defined as the
Options- A. gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen.
- B. energy needed to crush one tonne of feed to 200 microns.
- C. energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen.
- D. energy needed to crush one ton of feed to 100 microns.
- Correct Answer
- gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen.
- 1. The metals occuring at the lower most position in the electromotive series
Options- A. do not resist corrosion.
- B. resist corrosion very strongly.
- C. are very brittle.
- D. are heat insulators. Discuss
- 2. The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of diameter di and mass mi (i = 1, 2, 3, ...... ?) is given by
Options- A.
- B.
- C.
- D.
Discuss
- 3. Pick out the wrong statement.
Options- A. If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour.
- B. The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding.
- C. The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps.
- D. none of these. Discuss
- 4. High pressure fluid in a shell and tube heat exchanger should preferably be routed through the
Options- A. tubes to avoid the expansion of high pressure shell construction.
- B. shell side for smaller total pressure drop.
- C. shell side, if the flow is counter-current and tube side if the flow is co-current.
- D. shell side for large overall heat transfer co-efficient. Discuss
- 5. Pick out the wrong statement:
Options- A. The integral heat of solution of either components can not be calculated from heat of mixing data.
- B. The average value of heat of neutralisation of dilute solutions of weak acids and bases is much less compared to that for strong acids and bases.
- C. The standard heat of solution of the hydrate of a substance is the difference between the heat of solution of the anhydrous substance and its heat of hydration.
- D. The accompanying enthalpy change, when a solute is dissolved in solvent, depends upon the nature & amount of the solute & the solvent, on the temperature & on the initial & final concentrations of the solution. Discuss
- 6. 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is
Options- A. 0.00
- B. 0.18
- C. 0.24
- D. 1.00 Discuss
- 7. In a pressurised water reactor (PWR), the
Options- A. fuel is natural uranium and heavy water acts both as moderator & coolant.
- B. coolant water boils in the core of the reactor.
- C. coolant water is pressurised to prevent bulk boiling of water in the core.
- D. use of moderator is not required. Discuss
- 8. Pick out the correct statement.
Options- A. Heat of solution is always positive.
- B. At equilibrium, ?G is zero.
- C. For the reaction, PCl5⇌PCl3 + Cl2, ?G is less than ?E
- D. The heating of water in a beaker is an example of an isolated system. Discuss
- 9. In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B
Options- A. exhibits positive deviation from Raoult's law.
- B. exhibits negative deviation from Raoult's law.
- C. obeys Raoult's law.
- D. may exhibit either positive or negative deviation from Raoult's law. Discuss
- 10. Pick out the correct statement.
Options- A. Loss of electrons from neutral atoms produces negative ions.
- B. The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively.
- C. Gain of electrons by neutral atoms form cations.
- D. Proton to neutron ratio in a stable nucleus is 2 : 1. Discuss
More questions
Correct Answer: resist corrosion very strongly.
Correct Answer:
Correct Answer: none of these.
Correct Answer: tubes to avoid the expansion of high pressure shell construction.
Correct Answer: The integral heat of solution of either components can not be calculated from heat of mixing data.
Correct Answer: 0.18
Correct Answer: coolant water is pressurised to prevent bulk boiling of water in the core.
Correct Answer: At equilibrium, ?G is zero.
Correct Answer: exhibits positive deviation from Raoult's law.
Correct Answer: The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively.
Comments
There are no comments.More in Chemical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.