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- Question
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
- Correct Answer
- 0.18
- 1. ?-rays emission in radioactive disintegration is always accompanied by the emission of
Options- A. ?-rays
- B. ?-rays
- C. neutrons
- D. none of these Discuss
- 2. The biological decomposition of organic substances in wastes controlled conditions is called
Options- A. incineration
- B. biological oxidation
- C. composting
- D. none of these Discuss
- 3. A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be
Options- A. greater than that for uninsulated steam pipe.
- B. less than that of the uninsulated steam pipe.
- C. equal to that of the uninsulated steam pipe.
- D. less than the steam pipe with 5 cms insulation. Discuss
- 4. An alloy of Fe - 0.4 % C is
Options- A. cast iron.
- B. hypo-eutectoid steel.
- C. hyper-eutectoid steel.
- D. eutectoid steel Discuss
- 5. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
Options- A. 80 and 20
- B. 20 and 80
- C. 50 and 50
- D. 60 and 40 Discuss
- 6. Thermosetting plastic materials
Options- A. can be repeatedly melted.
- B. is useful for melt casting.
- C. can not be melted after forming.
- D. is useful for spinning. Discuss
- 7. Refractory bricks with lower permeability is produced by using
Options- A. higher firing temperature.
- B. higher moulding pressure.
- C. finer grog size.
- D. all (a), (b) and (c). Discuss
- 8. Cold crushing strength of fireclay bricks is about __________ kgf/cm2.
Options- A. 50-100
- B. 100-150
- C. 200-400
- D. 500-1000 Discuss
- 9. In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?
Options- A. Use of equation of state
- B. Fugacity co-efficient
- C. Activity co-efficient
- D. None of these Discuss
- 10. Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically
Options- A. polymethyl methacrylate (PMMA).
- B. Polytetraflouroethylene(PTFE).
- C. polycarbonates.
- D. phenolic resins. Discuss
More questions
Correct Answer: ?-rays
Correct Answer: composting
Correct Answer: less than that of the uninsulated steam pipe.
Correct Answer: hypo-eutectoid steel.
Correct Answer: 80 and 20
Correct Answer: can not be melted after forming.
Correct Answer: all (a), (b) and (c).
Correct Answer: 200-400
Correct Answer: Activity co-efficient
Correct Answer: polymethyl methacrylate (PMMA).
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