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1235. In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid

Is inversely proportional to the resistance across which the drop occurs

And the wall are proportional to individual resistances

And the wall is not related

None of these

✅ The correct answer is option B.

1236. In a 1-1 cocurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is

∞

Equal to the difference between hot and cold fluids inlet temperature

Equal to the difference between hot fluid inlet temperature and cold fluid outlet temperature

✅ The correct answer is option B.

1237. h.D/K is called the __________ number.

Nusselt

Peclet

Rayleigh

Grashoff

✅ The correct answer is option A.

1238. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is

0.33

1.33

✅ The correct answer is option C.

1239. With increase in temperature, the thermal conductivity of non-metallic amorphous solids

Decreases

Increases

Remains constant

First decreases upto certain temperature and then increases

✅ The correct answer is option B.

1240. In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell)

0.25 D

0.75 D

0.50 D

None of these

✅ The correct answer is option B.

1242. Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.

180

970

3.97

None of these

✅ The correct answer is option A.

1244. In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)

D/5 and D

D/2 and 2 D

D/4 and 2 D

D and 2 D

✅ The correct answer is option A.

1246. The rate of emission of radiation by a body does not depend upon the

Wavelength of radiation

Surface temperature of the body

Nature of the surface

Shape and porosity of the body

✅ The correct answer is option D.

1248. Crystal size in a continuous crystalliser depends upon the

Rate of heat transfer

Degree of turbulence

Degree of supersaturation

All of the above

✅ The correct answer is option D.

Author name: Admin