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1296. Black liquor generated during paper manufacture is concentrated in a

Single effect evaporator

Single effect evaporator followed by a crystalliser

Multiple effect evaporator

Multiple effect evaporators followed by a crystalliser

✅ The correct answer is option C.

1298. Baffles are provided in heat exchangers to increase the

Fouling factor

Heat transfer area

Heat transfer co-efficient

Heat transfer rate

✅ The correct answer is option C.

1300. For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in

Increased economy

Decreased economy

Lower capacity

No effect on economy

✅ The correct answer is option A.

1303. The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by

Forced convection

Natural convection

Transient conduction

Steady state conduction

✅ The correct answer is option C.

1306. The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

0.38-0.78

0.5-50

100-1000

May-50

✅ The correct answer is option B.

1309. The non-dimensional temperature gradient in a liquid at the wall of a pipe is the

Heat flux

Nusselt number

Prandtl number

Schmidt number

✅ The correct answer is option A.

1312. If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

Parabolic

Hyperbolic

Linear

Logarithmic

✅ The correct answer is option A.

1315. In an extended surface heat exchanger, fluid having lower co-efficient

Flows through the tube

Flows outside the tubes

Can flow either inside or outside the tubes

Should not be used as it gives very high pressure drop

✅ The correct answer is option B.

1318. Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.

Stefan’s

Dalton’s

Wien’s

Kirchoffs

✅ The correct answer is option C.

1321. Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Finned tube heat exchanger with air inside and steam outside

Finned tube heat exchanger with air outside and steam inside

Shell and tube heat exchanger with air inside tubes and steam on shell side

Shell and tube heat exchanger with air on shell side and steam inside tubes

✅ The correct answer is option B.

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