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- Question
High porosity refractory bricks have
Options- A. poor resistance to the peneration of molten slag, metal & flue gases.
- B. poor heat conductivity & low strength.
- C. better thermal spalling resistance.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 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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