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.
| 301. |
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. | |
| 302. |
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. | |
| 303. |
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. | |
| 304. |
Blast furnace stoves are meant for heating |
| A. | air |
| B. | blast furnace gas |
| C. | steam |
| D. | none of these |
| Answer» B. blast furnace gas | |
| 305. |
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. | |
| 306. |
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 | |
| 307. |
Which is the most thermally efficient furnace ? |
| A. | Reheating furnace |
| B. | Reverberatory furnace |
| C. | Rotary kilns |
| D. | Boiler furnace |
| Answer» E. | |
| 308. |
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. | |
| 309. |
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) | |
| 310. |
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 | |
| 311. |
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 | |
| 312. |
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 (a), (b) and (c). |
| Answer» E. | |
| 313. |
Ostwald charts are meant for |
| A. | computing the excess/deficiency of combustion air. |
| B. | calculation of flue gas temperature. |
| C. | computation of flue gas analysis. |
| D. | none of these. |
| Answer» B. calculation of flue gas temperature. | |
| 314. |
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. | |
| 315. |
Which of the following accentuates clinker-ing 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. | |
| 316. |
Maximum heat transfer in high temperature furnaces is by |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | either (a), (b) or (c); depends on the type of furnace |
| Answer» D. either (a), (b) or (c); depends on the type of furnace | |
| 317. |
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 | |
| 318. |
Ceramic recuperators compared to metallic recuperators for the same duty |
| A. | are lighter. |
| B. | occupy more space. |
| C. | are less costly. |
| D. | have higher pressure differential between flue gas & air side. |
| Answer» C. are less costly. | |
| 319. |
Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. |
| A. | 20 |
| B. | 40 |
| C. | 65 |
| D. | 80 |
| Answer» C. 65 | |
| 320. |
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. | |
| 321. |
__________ atmosphere is maintained inside an iron blast furnace. |
| A. | Oxidising |
| B. | Reducing |
| C. | Inert |
| D. | Decarburising |
| Answer» C. Inert | |
| 322. |
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 | |
| 323. |
__________ is an indirectly heated furnace. |
| A. | Open hearth furnace |
| B. | Muffle furnace |
| C. | Soaking pit |
| D. | Reheating furnace |
| Answer» C. Soaking pit | |
| 324. |
In order to maintain a reducing atmosphere in a furnace, it should have |
| A. | no O2 in flue gas |
| B. | CO in flue gas |
| C. | high excess air |
| D. | none of these |
| Answer» C. high excess air | |
| 325. |
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 | |
| 326. |
In salt bath furnace, heat is transferred to the charge mainly by |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | none of these |
| Answer» B. convection | |
| 327. |
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) | |
| 328. |
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of |
| A. | graphite powder |
| B. | thoria |
| C. | zircon powder |
| D. | beryllium |
| Answer» D. beryllium | |
| 329. |
Which of the following is a heat treatment furnace ? |
| A. | Muffle furnace |
| B. | Annealing furnace |
| C. | Reheating furnace |
| D. | Rotary kiln |
| Answer» C. Reheating furnace | |
| 330. |
Fuel used in B.F. stove is |
| A. | pulverised coal |
| B. | furnace oil |
| C. | blast furnace gas/mixed gas |
| D. | coke oven gas |
| Answer» D. coke oven gas | |
| 331. |
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). | |
| 332. |
Heat transfer rate to the stock/charge in the furnace does not depend upon the |
| A. | emissivity of the refactory walls. |
| B. | size of the furance. |
| C. | use of waste heat recovery equipments. |
| D. | thickness of the stock. |
| Answer» D. thickness of the stock. | |
| 333. |
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) | |
| 334. |
Which of the following variables affects the furnace capacity ? |
| A. | Temperature of flue gas. |
| B. | Thermal conductivity of stock. |
| C. | Thickness of heating stock. |
| D. | All (a), (b) and (c). |
| Answer» E. | |
| 335. |
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 | |
| 336. |
Cement Kiln is a |
| A. | rotary Kiln |
| B. | tunnel Kiln |
| C. | natural draft furnace |
| D. | batch furnace |
| Answer» B. tunnel Kiln | |