MCQOPTIONS
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MCQOPTIONS
This section includes 336 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
_ Reducing atmosphere is maintained in a$? |
| A. | Calcination kiln |
| B. | Blast furnace |
| C. | Soaking pit |
| D. | L.D. converter |
| Answer» C. Soaking pit | |
| 102. |
_ Dampers are located$? |
| 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 | |
| 103. |
_ __________ furnace is not an electric furnace.$? |
| A. | Arc |
| B. | Induction |
| C. | Pot |
| D. | Resistance |
| Answer» D. Resistance | |
| 104. |
_ The heating capacity of continuous reheating furnace depends upon the$? |
| 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. | |
| 105. |
_ In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of$? |
| A. | Transportation of coal |
| B. | Drying of coal |
| C. | Combustion of coal by supplying it around the burner |
| D. | Preheating the primary air |
| Answer» D. Preheating the primary air | |
| 106. |
_ Which is the most thermally efficient furnace?$? |
| A. | Reheating furnace |
| B. | Reverberatory furnace |
| C. | Rotary kilns |
| D. | Boiler furnace |
| Answer» E. | |
| 107. |
_ Oxygen enrichment of combustion air does not result in increase of the$? |
| A. | Flame temperature |
| B. | Oxygen in the flue gas |
| C. | Stack loss |
| D. | Heat transfer rate in the furnace |
| Answer» C. Stack loss | |
| 108. |
_ Calcination of limestone to produce lime is done in a __________ kiln.$? |
| A. | Tunnel |
| B. | Rotary |
| C. | Vertical shaft |
| D. | Both B and C |
| Answer» E. | |
| 109. |
_ The function of an economiser in a boiler is to preheat the$? |
| A. | Feedwater |
| B. | Combustion air |
| C. | Pulverised coal |
| D. | Furnace oil |
| Answer» B. Combustion air | |
| 110. |
_ Thermal efficiency of furnaces can be improved by$? |
| A. | Waste heat recovery from flue gas |
| B. | Minimising heat losses from furnace walls |
| C. | Maintaining proper draught |
| D. | All of the above |
| Answer» E. | |
| 111. |
_ Example of an indirectly heated furnace is$? |
| A. | Hood annealing furnace |
| B. | Muffle furnace |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 112. |
_ In which of the following furnaces, the gases are sucked through the stock bed from below?$? |
| A. | Soaking pit |
| B. | Sintering machine |
| C. | Beehive oven |
| D. | None of these |
| Answer» C. Beehive oven | |
| 113. |
_ Very high pressure boilers are usually __________ boilers.$? |
| A. | Fire tube |
| B. | Water tube |
| C. | Waste heat |
| D. | Natural circulation |
| Answer» E. | |
| 114. |
_ Regenerators are installed in$? |
| A. | Coke ovens |
| B. | Open hearth furnace |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 115. |
_ Which is a continuous furnace?$? |
| A. | Coke ovens |
| B. | Annealing furnace |
| C. | Glass tank furnace |
| D. | None of these |
| Answer» D. None of these | |
| 116. |
_ Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?$? |
| A. | Increase in calorific value of the fuel |
| B. | Increase in flame temperature |
| C. | Reduction in scale losses |
| D. | Saving in fuel consumption |
| Answer» B. Increase in flame temperature | |
| 117. |
_ Which of the following is a periodic furnace?$? |
| A. | Tunnel kiln |
| B. | Rotary kiln |
| C. | Soaking pit |
| D. | Reheating furnace |
| Answer» D. Reheating furnace | |
| 118. |
_ Turndown ratio of a burner gives an idea of the __________ in the furnace.$? |
| 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 | |
| 119. |
_ Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an$? |
| A. | Blast furnace |
| B. | Steam boiler |
| C. | Salt bath furnace |
| D. | Annealing furnace |
| Answer» D. Annealing furnace | |
| 120. |
_ In a furnace employing forced draught as compared to induced draught,$? |
| A. | Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced |
| B. | The fan operates hot and hence blades are liable to corrosion and erosion |
| C. | Positive pressure exists in the furnace |
| D. | None of these |
| Answer» D. None of these | |
| 121. |
_ The heat recoverable from flue gases of furnaces depends on the$? |
| A. | Thermal efficiency of furnace |
| B. | Quantity of flue gases |
| C. | Flue gas temperature drop through the furnace |
| D. | All of the above |
| Answer» E. | |
| 122. |
_ Which of the following is not an additive for flue gases from furnace to reduce its dew-point?$? |
| A. | Ammonia |
| B. | Fine dolomite |
| C. | Alkaline powders |
| D. | None of these |
| Answer» E. | |
| 123. |
__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 of the above |
| Answer» E. | |
| 124. |
__Maximum thermal efficiency of boiler may be about __________ percent.__ |
| A. | 10 |
| B. | 25 |
| C. | 65 |
| D. | 90 |
| Answer» E. | |
| 125. |
__Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?__ |
| A. | Economiser |
| B. | Regenerator |
| C. | Ceramic recuperator |
| D. | Waste heat boiler |
| Answer» C. Ceramic recuperator | |
| 126. |
_Which of the following furnaces will have maximum thermal efficiency?$? |
| A. | Soaking pits |
| B. | Walking beam reheating furnace |
| C. | Boiler furnace |
| D. | Rotary kilns |
| Answer» D. Rotary kilns | |
| 127. |
_The method of Lobo and Evans is concerned with the calculation of the$? |
| A. | Heat absorption in radiant section of a furnace |
| B. | Heat transfer by forced convection in a reboiler |
| C. | Heat transfer in vacuum condensers |
| D. | Mass transfer co-efficient |
| Answer» B. Heat transfer by forced convection in a reboiler | |
| 128. |
_Circulation of gases in furnace is caused by the$? |
| A. | Change in volume during a change of temperature |
| B. | Difference in density between hot and cold gases |
| C. | Furnace pressure in conjunction with draft in flues |
| D. | All of the above |
| Answer» E. | |
| 129. |
_Which of the following is a batch furnace?$? |
| A. | Cupola |
| B. | Reheating furnace |
| C. | Glass tank furnace |
| D. | None of these |
| Answer» B. Reheating furnace | |
| 130. |
_The rate of scaling of furnace stock depends upon the$? |
| A. | Temperature |
| B. | Time |
| C. | Nature of atmosphere |
| D. | All of the above |
| Answer» E. | |
| 131. |
_Heat balance of furnace provides means of determining the$? |
| A. | Thermal efficiency of the process |
| B. | Sources of heat losses |
| C. | Scope of reduction of heat losses |
| D. | All of the above |
| Answer» E. | |
| 132. |
___________ is an indirectly heated furnace.$? |
| A. | Open hearth furnace |
| B. | Muffle furnace |
| C. | Soaking pit |
| D. | Reheating furnace |
| Answer» C. Soaking pit | |
| 133. |
Which is a regenerative furnace?$? |
| A. | Coke oven heating chamber |
| B. | Open hearth furnace |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 134. |
Protective gas used in the annealing furnace for steel coil comprises of$? |
| A. | 95% N‚ÇÇ + 5% H‚ÇÇ |
| B. | 5% H‚ÇÇ + 9% N‚ÇÇ |
| C. | 100% CO |
| D. | 100 %H‚ÇÇ |
| Answer» B. 5% H‚Äö√á√á + 9% N‚Äö√á√á | |
| 135. |
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.$? |
| A. | 50 |
| B. | 65 |
| C. | 85 |
| D. | 99 |
| Answer» D. 99 | |
| 136. |
Air filtration in a furnace$? |
| A. | Reduces its thermal efficiency |
| B. | Is indicated by flame sting out |
| C. | Increases the flue gas temperature |
| D. | None of these |
| Answer» B. Is indicated by flame sting out | |
| 137. |
Power required in case of forced draught as compared to induced draught (for the same draught produced) is$? |
| A. | Same |
| B. | Less |
| C. | More |
| D. | Either more or less; depends on the flue gas density |
| Answer» C. More | |
| 138. |
Fuel economy in an industrial furnace operation can not be achieved by the use of$? |
| A. | Stoichiometric combustion air |
| B. | Non-preheated combustion air |
| C. | Combustion air not enriched with oxygen |
| D. | Recupterators |
| Answer» B. Non-preheated combustion air | |
| 139. |
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.$? |
| A. | Resistance |
| B. | Arc |
| C. | Low frequency induction |
| D. | None of these |
| Answer» C. Low frequency induction | |
| 140. |
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?$? |
| A. | Coke oven |
| B. | Blast furnace stoves |
| C. | Beehive coke oven |
| D. | High pressure boiler |
| Answer» E. | |
| 141. |
Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a$? |
| A. | Furnace employing neutral atmosphere |
| B. | Carbon resistance furnace |
| C. | Reducing atmosphere |
| D. | Furnace employing negative pressure |
| Answer» C. Reducing atmosphere | |
| 142. |
In a muffle furnace, the muffle$? |
| A. | Retards the heat transfer |
| B. | Assists in temperature equalisation in the charge |
| C. | Permits the use of controlled atmosphere for the protection of stock |
| D. | All of the above |
| Answer» E. | |
| 143. |
Which one is not an induced draught furnace?$? |
| A. | Blast furnace stove |
| B. | Sintering furnace |
| C. | High pressure boiler |
| D. | None of these |
| Answer» B. Sintering furnace | |
| 144. |
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the$? |
| A. | Rate of firing and emissivity of flame |
| B. | Thermal conductivity of the charge & structural materials of furnace |
| C. | Nature of process ; whether batch, continuous or intermittant |
| D. | All of the above |
| Answer» E. | |
| 145. |
Regenerators as compared to recuperators for the same duty$? |
| A. | Store smaller quantity of waste heat |
| B. | Are lighter & compact |
| C. | Involve higher initial cost |
| D. | All of the above |
| Answer» D. All of the above | |
| 146. |
Which is not accomplished in an underfired furnace?$? |
| A. | Increase in heating capacity/m² of floor space |
| B. | Elimination of cold spot at the bottom of the charge |
| C. | Reduction in the temperature of furnace gases |
| D. | Portection of the periphery of the charge from excessive radiation |
| Answer» B. Elimination of cold spot at the bottom of the charge | |
| 147. |
Fuel economy in furnaces can be achieved by$? |
| A. | Using oxygen enriched combustion air |
| B. | Preheating the combustion air |
| C. | Reducing the heat loss through furnace openings & doors |
| D. | All of the above |
| Answer» E. | |
| 148. |
The main function of a muffle in the muffle furnace is to$? |
| A. | Protect the charge from the effects of the products of combustion |
| B. | Smooth out temperature inequalities on the combustion side of the muffle wall |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 149. |
In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?$? |
| A. | Recuperator |
| B. | Regenerator |
| C. | Waste heat boiler |
| D. | None of these |
| Answer» C. Waste heat boiler | |
| 150. |
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 | |