MCQOPTIONS
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MCQOPTIONS
This section includes 116 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which one is not an induced draught furnace ? |
| A. | Blast furnace stove |
| B. | Sintering furnace |
| C. | High pressure boiler |
| D. | None of these |
| Answer» B. Sintering furnace | |
| 2. |
Which one shows the diagrammatic heat balance in a furnace ? |
| A. | Sankey diagram |
| B. | Cox chart |
| C. | Ostwald chart |
| D. | None of these |
| Answer» B. Cox chart | |
| 3. |
While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about _____________ °C? |
| A. | 2000 |
| B. | 3000 |
| C. | 4500 |
| D. | 6000 |
| Answer» D. 6000 | |
| 4. |
Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ? |
| A. | Ammonia |
| B. | Fine dolomite |
| C. | Alkaline powders |
| D. | None of these |
| Answer» E. | |
| 5. |
Which of the following is a periodic furnace ? |
| A. | Tunnel kiln |
| B. | Rotary kiln |
| C. | Soaking pit |
| D. | Reheating furnace |
| Answer» D. Reheating furnace | |
| 6. |
Which of the following is a directly fired intermittent furnace ? |
| A. | Walking beam reheating furnace |
| B. | Reverberatory furnace |
| C. | Tower furnace |
| D. | Tunnel kiln |
| Answer» C. Tower furnace | |
| 7. |
Which of the following accentuates clinkering troubles on furnace grate burning coal ? |
| A. | Low reactivity of carbonised residue containing high proportion of iron & sulphur |
| B. | Low forced draft & fuel bed temperature |
| C. | Thick firebed and preheated primary air |
| D. | All A., B. and C. |
| Answer» E. | |
| 8. |
Which is the most thermally efficient furnace _______________________? |
| A. | Reheating furnace |
| B. | Reverberatory furnace |
| C. | Rotary kilns |
| D. | Boiler furnace |
| Answer» E. | |
| 9. |
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 A., B. and C. |
| Answer» E. | |
| 10. |
Very high pressure boilers are usually _____________ boilers? |
| A. | Fire tube |
| B. | Water tube |
| C. | Waste heat |
| D. | Natural circulation |
| Answer» E. | |
| 11. |
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 | |
| 12. |
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 | |
| 13. |
Turndown ratio of a burner gives an idea of the ______________ in the furnace? |
| A. | Range of fuel firing rates |
| B. | Volume of the combustion chamber |
| C. | Maximum heat input rate only |
| D. | Minimum heat input rate only |
| Answer» B. Volume of the combustion chamber | |
| 14. |
Turn down ratio of a burner____________________? |
| A. | Should be as low as possible i.e., 1 : 2 |
| B. | Should be 1:1 for a batch type furnace |
| C. | Is the ratio of maximum to minimum permissible heat input rates |
| D. | Is normally much more for a continuous furnace as compared to a batch furnace |
| Answer» D. Is normally much more for a continuous furnace as compared to a batch furnace | |
| 15. |
To reduce the stack loss, heat recovery from flue gas can be done by_____________________? |
| A. | Preheating of cold stock |
| B. | Preheating of combustion air |
| C. | Steam generation in waste heat boilers |
| D. | All A., B. and C. |
| Answer» E. | |
| 16. |
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of__________________? |
| A. | Low emissivity |
| B. | High thermal conductivity |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 17. |
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about _____________ percent? |
| A. | 20 |
| B. | 40 |
| C. | 60 |
| D. | 80 |
| Answer» E. | |
| 18. |
Thermal efficiency of furnaces can be improved by____________________? |
| A. | Waste heat recovery from flue gas |
| B. | Minimising heat losses from furnace walls |
| C. | Maintaining proper draught |
| D. | All A., B. and C. |
| Answer» E. | |
| 19. |
Thermal efficiency of a limestone calcination rotary kiln may be around ______________ percent? |
| A. | 20 |
| B. | 40 |
| C. | 65 |
| D. | 80 |
| Answer» C. 65 | |
| 20. |
Thermal efficiency of an open hearth furnace may be about _____________ percent? |
| A. | 5 |
| B. | 20 |
| C. | 50 |
| D. | 80 |
| Answer» C. 50 | |
| 21. |
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent? |
| A. | 50 |
| B. | 65 |
| C. | 85 |
| D. | 99 |
| Answer» D. 99 | |
| 22. |
The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about ____________ percent? |
| A. | 15 |
| B. | 40 |
| C. | 70 |
| D. | 85 |
| Answer» C. 70 | |
| 23. |
The resistance furnace produces heat by the__________________? |
| A. | Electric arc struck between electrodes and the charge |
| B. | Flow of current through a heating element |
| C. | Combination of induced current and skin effect |
| D. | None of these |
| Answer» C. Combination of induced current and skin effect | |
| 24. |
The reason for excessive clinker formation in gas producers is the_____________________? |
| A. | Use of coal/coke containing a high % of fines and ash |
| B. | Use of fuel having too low an ash fusion temperature |
| C. | Development of hot spots in the fuel bed and an abnormally high rate of gasification |
| D. | All A., B. and C. |
| Answer» E. | |
| 25. |
The rate of scaling of furnace stock depends upon the_________________? |
| A. | Temperature |
| B. | Time |
| C. | Nature of atmosphere |
| D. | All A., B. and C. |
| Answer» E. | |
| 26. |
The purpose of controlling the furnace atmosphere is to prevent surface attack by__________________? |
| A. | Oxidation/scaling |
| B. | Decarburising |
| C. | Sulphur penetration |
| D. | Either of the above |
| Answer» E. | |
| 27. |
The main function of a muffle in the muffle furnace is to__________________? |
| A. | Protect the charge from the effects of the products of combustion |
| B. | Smooth out temperature inequalities on the combustion side of the muffle wall |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 28. |
The heating capacity of muffle furnace depends on the_________________? |
| A. | Surface area & emissivity of the stock |
| B. | Properties of the muffle wall (temperature, area, and emissivity) |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 29. |
The heating capacity of muffle furnace depends on the____________________? |
| A. | Surface area & emissivity of the stock |
| B. | Properties of the muffle wall (temperature, area, and emissivity) |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 30. |
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 | |
| 31. |
The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace? |
| A. | Arc |
| B. | Resistance |
| C. | Low frequency induction |
| D. | High frequency induction |
| Answer» E. | |
| 32. |
The amount of combustible escaping unconsumed from the furnace, depends upon the________________? |
| A. | Air supplied and furnace temperature |
| B. | Burner design (thoroughness of mixing versus stratification) |
| C. | Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction) |
| D. | All A., B. and C. |
| Answer» E. | |
| 33. |
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 A., B. and C. |
| Answer» D. All A., B. and C. | |
| 34. |
Scaling of furnace stock is reduced by _______________ in flue gas? |
| A. | CO |
| B. | H2 |
| C. | High CO/CO2 |
| D. | All A., B. & C. |
| Answer» E. | |
| 35. |
Rotary kilns are used in the____________________? |
| A. | Calcination of limestone & dolomite |
| B. | Cement manufacture |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 36. |
Reverberatory furnace is used for_____________________? |
| A. | Roasting/reduction of ores |
| B. | Annealing steel coil |
| C. | Heating air |
| D. | Steel melting |
| Answer» B. Annealing steel coil | |
| 37. |
Reheating furnace (pusher type) is used for heating_____________________? |
| A. | Ingots |
| B. | Slabs |
| C. | Steel coils |
| D. | Steel sheets |
| Answer» C. Steel coils | |
| 38. |
Regenerators compared to the recuperators for the same duty__________________? |
| A. | Occupy more space |
| B. | Are less costly |
| C. | Are of smaller size |
| D. | All A., B. and C. |
| Answer» B. Are less costly | |
| 39. |
Regenerators are installed in_______________? |
| A. | Coke ovens |
| B. | Open hearth furnace |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 40. |
Regenerators as compared to recuperators for the same duty_________________? |
| A. | Store smaller quantity of waste heat |
| B. | Are lighter & compact |
| C. | Involve higher initial cost |
| D. | All A., B. & C. |
| Answer» D. All A., B. & C. | |
| 41. |
Regenerators are normally provided in the____________________? |
| A. | Glass melting furnace |
| B. | Open hearth furnace |
| C. | By product coke ovens |
| D. | All A., B. and C. |
| Answer» E. | |
| 42. |
Regenerators are used for waste heat recovery in____________________? |
| A. | By-product coke ovens |
| B. | Beehive coke oven |
| C. | Blast furnace stoves |
| D. | Soaking pits |
| Answer» B. Beehive coke oven | |
| 43. |
Reducing atmosphere is maintained in a__________________? |
| A. | Calcination kiln |
| B. | Blast furnace |
| C. | Soaking pit |
| D. | L.D. converter |
| Answer» C. Soaking pit | |
| 44. |
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/m3 combustion space | |
| 45. |
Pulverised fuel fired furnaces employ ______________ fuel firing? |
| A. | Horizontal |
| B. | Vertical |
| C. | Tangential |
| D. | All A., B. and C. |
| Answer» E. | |
| 46. |
Protective gas used in the annealing furnace for steel coil comprises of__________________? |
| A. | 95% N2 + 5% H2 |
| B. | 5% H2 + 9% N2 |
| C. | 100% CO |
| D. | 100% H2 |
| Answer» B. 5% H2 + 9% N2 | |
| 47. |
Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________? |
| A. | Accelerating the rate of scaling |
| B. | Causing metal embrittlement |
| C. | Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature |
| D. | All A., B. and C. |
| Answer» E. | |
| 48. |
Power required in case of forced draught as compared to induced draught (for the same draught produced) is___________________? |
| A. | Same |
| B. | Less |
| C. | More |
| D. | Either more or less; depends on the flue gas density |
| Answer» C. More | |
| 49. |
Pot furnace which is either regenerative or recuperative, is used in the manufacture of____________________? |
| A. | Glass |
| B. | Stainless steel |
| C. | Potteries |
| D. | Refractory bricks |
| Answer» B. Stainless steel | |
| 50. |
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent? |
| A. | < 2 |
| B. | < 5 |
| C. | < 8 |
| D. | < 10 |
| Answer» B. < 5 | |