MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
*$_Combustion of fuel in a furnace with oxygen enriched air results in higher? |
| A. | Flue gas volume |
| B. | Flame temperature |
| C. | Fuel consumption |
| D. | Stack loss |
| Answer» C. Fuel consumption | |
| 2. |
*$_Rate of heat release in a furnace, which is the measure of heat intensity is defined as? |
| A. | Kcal/hr/m³ combustion space |
| B. | Kcal/m³ combustion space |
| C. | Kcal/hr |
| D. | None of these |
| Answer» B. Kcal/m¬¨‚â• combustion space | |
| 3. |
*$_Large tonnage of refractory bricks are dried in a? |
| A. | Shaft furnace |
| B. | Rotary hearth furnace |
| C. | Tunnel kiln |
| D. | Muffle furnace |
| Answer» D. Muffle furnace | |
| 4. |
*/*_Which of the following is a natural draft furnace?? |
| A. | Blast furnace stoves |
| B. | Power plant boilers |
| C. | Sintering furnace |
| D. | None of these |
| Answer» B. Power plant boilers | |
| 5. |
*/*_In producer gas making furnace, steam is added along with air to mainly control the? |
| A. | Fusion of coal ash & clinker formation |
| B. | C. V. of producer gas |
| C. | Temperature of producer gas |
| D. | Tar content in producer gas |
| Answer» B. C. V. of producer gas | |
| 6. |
*/*_Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.? |
| A. | 20 |
| B. | 40 |
| C. | 65 |
| D. | 80 |
| Answer» C. 65 | |
| 7. |
*/*_Decarburisation of steel? |
| A. | Is the removal of carbon from iron carbide (Fe‚ÇÉC) |
| B. | Affects its crystalline structure |
| C. | Is favoured by CO‚ÇÇ |
| D. | All of the above |
| Answer» E. | |
| 8. |
*/*_In reverberatory furnace, charge is heated mainly by? |
| A. | Conduction |
| B. | Natural convection |
| C. | Radiation of heat from the roof of the combustion chamber |
| D. | None of these |
| Answer» D. None of these | |
| 9. |
*/*_Means for giving direction to the circulation of gases in furnaces are? |
| A. | Fans |
| B. | Arrangement of heating stock in the furnaces |
| C. | Location of outlet ports and heating & combustion devices |
| D. | All of the above |
| Answer» E. | |
| 10. |
*/*_If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.? |
| A. | Sidefired |
| B. | Underfired |
| C. | Covered |
| D. | Recirculating |
| Answer» C. Covered | |
| 11. |
*/*_In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the? |
| A. | Ostwald chart |
| B. | Cox chart |
| C. | Sankey diagram |
| D. | None of these |
| Answer» D. None of these | |
| 12. |
*/*_Size of the combustion chamber of a furnace depends upon the? |
| A. | Heat release rate of the fuel |
| B. | Preheat temperature of fuel & air |
| C. | Method of mixing the fuel & air |
| D. | All of the above |
| Answer» E. | |
| 13. |
*/*_Pot furnace which is either regenerative or recupterative, is used in the manufacture of? |
| A. | Glass |
| B. | Stainless steel |
| C. | Potteries |
| D. | Refractory bricks |
| Answer» B. Stainless steel | |
| 14. |
*/*___________ atmosphere is maintained inside an iron blast furnace.? |
| A. | Oxidising |
| B. | Reducing |
| C. | Inert |
| D. | Decarburising |
| Answer» C. Inert | |
| 15. |
*/*_Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the? |
| A. | Physical nature, ash content and fineness of the coal |
| B. | Amount of excess air supplied and load on the boiler |
| C. | Type of burner and combustion chamber |
| D. | All of the above |
| Answer» E. | |
| 16. |
*/*_The advantages of firing pulverised coal in the furnace lies in the fact that, it? |
| A. | Permits the use of high ash content coal |
| B. | Permits the use of low fusion point ash coal |
| C. | Accelerates the burning rate and economises on fuel consumption |
| D. | All of the above |
| Answer» D. All of the above | |
| 17. |
*/*_A refractory wall separating the stock and the source of heat is provided in a? |
| A. | Updraft kiln |
| B. | Muffle furnace |
| C. | Continuous furnace |
| D. | None of these |
| Answer» C. Continuous furnace | |
| 18. |
*/*_Recuperator is? |
| A. | Not used for fuel gas preheating |
| B. | An intermittant waste heat recovery equipment |
| C. | A continuous waste heat recovery equipment |
| D. | Heavier than regenerator meant for the same duty |
| Answer» D. Heavier than regenerator meant for the same duty | |
| 19. |
*/*_Use of pulverised coal in boilers provides? |
| A. | Higher calorific value |
| B. | Better combustion |
| C. | Smokeless burning |
| D. | Less erosion on furnace wall |
| Answer» C. Smokeless burning | |
| 20. |
*/*_Which is not a hearth furnace?? |
| A. | Glass tank furnace |
| B. | Open hearth furnace |
| C. | Cupola |
| D. | Reheating furnace |
| Answer» D. Reheating furnace | |
| 21. |
*/*_Operation of blast furnace stove is based on the principles of a __________ furnace.? |
| A. | Regenerative |
| B. | Recuperative |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» B. Recuperative | |
| 22. |
*/*_Low stack loss indicates the? |
| A. | Use of sub-stoichiometric air for combustion |
| B. | Efficient use of fuel |
| C. | Inefficient use of fuel |
| D. | Oxygen enrichment of combustion air |
| Answer» C. Inefficient use of fuel | |
| 23. |
*/*_Furnace aerodynamics is related to the __________ in the furnace.? |
| A. | Movement of gases |
| B. | Measurement of flue gas volume |
| C. | Temperature control |
| D. | Pressure adjustment |
| Answer» B. Measurement of flue gas volume | |
| 24. |
*/*_Unit of furnace loading is? |
| A. | Ton stock/hr/m² hearth area |
| B. | Ton stock/hr |
| C. | Ton stock/m² hearth area |
| D. | Both B and C |
| Answer» B. Ton stock/hr | |
| 25. |
*/*_Coke ovens in steel plant are heated by? |
| A. | Electricity |
| B. | Blast furnace gas/mixed gas |
| C. | Coke oven gas |
| D. | Both B and C |
| Answer» E. | |
| 26. |
*/*_Shaft furnaces are used for? |
| A. | Smelting |
| B. | Calcining |
| C. | Roasting |
| D. | All of the above |
| Answer» E. | |
| 27. |
*/*_In low or standard frequency induction furnace, heat is produced by the? |
| A. | Combination of induced current and skin effect |
| B. | Induction and resistance |
| C. | Current flow through a heating element |
| D. | None of these |
| Answer» C. Current flow through a heating element | |
| 28. |
*/*_Specific heating capacity of a furnace is expressed as? |
| A. | Weight heated/hr |
| B. | Weight heated/furnace volume |
| C. | Weight heated/hr/furnace volume |
| D. | None of these |
| Answer» D. None of these | |
| 29. |
*/*_Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.? |
| A. | 10-15 |
| B. | 25-30 |
| C. | 45-50 |
| D. | 65-70 |
| Answer» C. 45-50 | |
| 30. |
*/*___________ furnace is not an electric furnace.? |
| A. | Arc |
| B. | Induction |
| C. | Pot |
| D. | Resistance |
| Answer» D. Resistance | |
| 31. |
*/*_Dampers are located? |
| A. | Before the I.D fan |
| B. | After the I.D. fan |
| C. | Near the top of the chimney |
| D. | Anywhere after the I.D. fan |
| Answer» B. After the I.D. fan | |
| 32. |
*/*_In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of? |
| A. | Transportation of coal |
| B. | Drying of coal |
| C. | Combustion of coal by supplying it around the burner |
| D. | Preheating the primary air |
| Answer» D. Preheating the primary air | |
| 33. |
*/*_The heating capacity of continuous reheating furnace depends upon the? |
| A. | Hearth area and furnace temperature |
| B. | Emissivity of the stock |
| C. | Ratio of wall surface to stock surface |
| D. | All of the above |
| Answer» E. | |
| 34. |
*/*_Calcination of limestone to produce lime is done in a __________ kiln.? |
| A. | Tunnel |
| B. | Rotary |
| C. | Vertical shaft |
| D. | Both B and C |
| Answer» E. | |
| 35. |
*/*_Which is the most thermally efficient furnace?? |
| A. | Reheating furnace |
| B. | Reverberatory furnace |
| C. | Rotary kilns |
| D. | Boiler furnace |
| Answer» E. | |
| 36. |
*/*_Oxygen enrichment of combustion air does not result in increase of the? |
| A. | Flame temperature |
| B. | Oxygen in the flue gas |
| C. | Stack loss |
| D. | Heat transfer rate in the furnace |
| Answer» C. Stack loss | |
| 37. |
*/*_Which of the following is a rotary furnace?? |
| A. | Lime kiln |
| B. | Soaking pit |
| C. | Stoves |
| D. | Annealing furnace |
| Answer» B. Soaking pit | |
| 38. |
*/*_Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.? |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 250 |
| Answer» D. 250 | |
| 39. |
*/*_An example of a periodic furnace is the? |
| A. | Blast furnace stoves |
| B. | Blast furnace |
| C. | Coke oven heating chamber |
| D. | Rotary kilns |
| Answer» B. Blast furnace | |
| 40. |
*/*_Pulverised fuel fired furnaces employ __________ fuel firing.? |
| A. | Horizontal |
| B. | Vertical |
| C. | Tangential |
| D. | All of the above |
| Answer» E. | |
| 41. |
*/*_Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.? |
| A. | 350 |
| B. | 750 |
| C. | 1050 |
| D. | 1250 |
| Answer» C. 1050 | |
| 42. |
*/*_The function of an economiser in a boiler is to preheat the? |
| A. | Feedwater |
| B. | Combustion air |
| C. | Pulverised coal |
| D. | Furnace oil |
| Answer» B. Combustion air | |
| 43. |
%_Dampers are located_% |
| A. | Before the I.D fan |
| B. | After the I.D. fan |
| C. | Near the top of the chimney |
| D. | Anywhere after the I.D. fan |
| Answer» B. After the I.D. fan | |
| 44. |
%_Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C._% |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 250 |
| Answer» D. 250 | |
| 45. |
_ An example of a periodic furnace is the$? |
| A. | Blast furnace stoves |
| B. | Blast furnace |
| C. | Coke oven heating chamber |
| D. | Rotary kilns |
| Answer» B. Blast furnace | |
| 46. |
_ Pulverised fuel fired furnaces employ __________ fuel firing.$? |
| A. | Horizontal |
| B. | Vertical |
| C. | Tangential |
| D. | All of the above |
| Answer» E. | |
| 47. |
_ Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.$? |
| A. | 350 |
| B. | 750 |
| C. | 1050 |
| D. | 1250 |
| Answer» C. 1050 | |
| 48. |
_ Which of the following is a rotary furnace?$? |
| A. | Lime kiln |
| B. | Soaking pit |
| C. | Stoves |
| D. | Annealing furnace |
| Answer» B. Soaking pit | |
| 49. |
_ Which of the following is the most suitable for preheating combustion air above 650°C ?$? |
| A. | Regenerator |
| B. | Metallic recuperator |
| C. | Ceramic recuperator |
| D. | None of these |
| Answer» D. None of these | |
| 50. |
_ Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an$? |
| A. | Economiser |
| B. | Steam superheater |
| C. | Air preheater |
| D. | All of the above |
| Answer» E. | |