Chemical Engineering · all questions

Heat Transfer
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Q321

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

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Q322

Boiling point elevation of a solution of NaOH

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Q323

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

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Q324

In counter flow compared to parallel flow,

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Q325

Pick out the wrong statement.

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Q326

Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

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Q327

At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

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Q328

Rate of heat transfer by vaporisation from pools of water is affected by the

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Q329

The value of Stefan-Boltazman constant in SI unit is

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Q330

The Stefan-Boltzman constant depends on the

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Q331

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

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Q332

Which of the following has maximum thermal conductivity?

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Q333

For specified tube outside diameter, higher BWG means higher

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Q334

Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

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Q335

Which of the following has the minimum thermal conductivity?

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Q336

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

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Q337

Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

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Q338

In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is

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Q339

Heat transfer occurs by natural convection because change in temperature causes difference in

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Q340

In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

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