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Chapter 2.5 - Insulation and Refractories

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Question bank for Energy Managers & Energy Auditors Chapter 2.5: Insulation & Refractories Part-I: Objective type questions and answers 1. A thermal insulator is a) good conductor of heat and has high thermal conductivity b) poor conductor of heat and has high thermal conductivity c) good conductor of heat and has low thermal conductivity d) poor conductor of heat and has low thermal conductivity 2. The insulation material suitable for low temperature application is a) Mineral fibre 3. b) Calcium silicate c) Mineral fibre b) 1050 C Suitable temperature i) - 178 C to 4 C b) Fibre glass ii) -167 C to 82 C c) Polystyrene iii) Up to 820 C d) Polyurethane iv) Up to 540 C a-iii); b-iv); c-ii); b) fibre glass c) rock wool d) Alumina The unit for thermal coefficient of insulation and refractories is SI system is ____. a) K.cal/m-hr- C b) K.cal/ m -hr- C c) K.cal/m - C d) K.cal/ m- C The coefficient of thermal expansion of refractory material should be ___. a) low 9. d-i) Select the suitable cost effective insulation for steam pipelines with temperature of 540 C. a) calcium silicate 8. d) 1850 C Match the following: a) Rockwool 7. d) All of the above c) 1430 C Insulating material 6. d) polyurethane Ceramic fibre insulation is suitable up to temperature of a) 540 C 5. c) Silica The insulation materials used for medium temperature application is a) Asbestos 4. b) Fibre glass b) High c) Medium d) very high Magnesite, chrome-magnesite, dolomite are examples of --------- type of refractory a) acid b) basic c) neutral 2.5 Insulation & refractories - revised (table format) d) none of the above 32

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