Food Engineering Mock Test 4

1. Freezer is at -18 deg C. Will will be Radiative heat transfer if meat is at 298k, its emissivity is 0.82 and average area is 0.045m².
Either use Stefan Boltzmann law or take h_r (radiative heat transfer co-efficient) as 0.227.
ε = ( T_av/100 )³

2. Dittus-boelter equation is applicable for fluids with phase change.

3. Which of the following is untrue?

4. Which of the following is true about Plate heat exchangers?

5. Plate evaporators are used in recovering aroma from fruit juices.

6. In a rising film evaporator, the temperature difference need not be as high as that in a falling film evaporator.

7. Rayleigh number is _____

8. Recently, cancer causing effects, nutritional destructions of food and biological effects of exposure of microwave heating has come into light.

9. Statement 1: Generally, in small scaled jacketed pans, food products like jams, sauces etc are made.
Statement 2: Baffles provide structural support to tubes, but they cannot prevent channeling.

10. Contamination takes place to high extend in Plate heat exchangers.