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Food Engineering Practice Test: Heat Transfer by Conduction, Convection and Radiation
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Heat transfer can occur through conduction, convection, and radiation:   Conduction: Heat is transferred from the hotter end of an object to the colder end through physical contact. For example, when you touch a metal cooking pot in an air-conditioned room, your hand loses heat to the colder pot. Convection: Heat is transferred by the movement of a heated fluid, such as air or water. For example, in free convection, warm air or water rises and is replaced by cooler air or water. Radiation: Heat is transferred between objects without direct physical contact through electromagnetic waves.... Show more
Food Engineering Practice Test: Heat Transfer by Conduction, Convection and Radiation
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25 Questions

1. Statement 1: Radiation dryers are used to dry grains and reduce their moisture content before storage.

Statement 2: Baking ovens are used both for making the dough and after that’s made, making biscuits by cutting them and baking them further. This entire process uses radiation.
2. According to Nusselt’s film theory, the film thickness decreases as we move from bottom to top. The heat transfer increases.
3. Statement 1: α=k/(ρCp)

Statement 2: α stands for thermal conductivity.
4. The reciprocal of heat transfer co-efficient is _____
5. Which of the following is true about Natural Convection?
6. Radiation dryers use _____
7. Statement 1: When the average radius gives an error, log mean radius is used.

Statement 2: Log mean radius is given by rL= ( r0– ri )/(ln(r0/ri))
8. Statement 1: Radiation is NOT heat.

Statement 2: Maximum value of absorptivity is 1.
9. Statement 1: Radiation is the transfer of heat by electromagnetic waves.

Statement 2: When heat is radiated from a hot source, the amount of heat received by the body depends on the nature of the body.
10. Statement 1: Drop-wise condensation takes place on a smooth surface.

Statement 2: All the resistance to heat transfer lies in the film formed during Film-type condensation.
11. Statement 1: Radiation needs a medium to travel.

Statement 2: Thermal radiation takes place at a certain temperature for every body.
12. Statement 1: G is known as the mass flux and it is the product of density and velocity.

Statement 2: Grashof number is associated with forced convection.
13. Which of the following reason does NOT affect radiation between two parallel bodies?
14. Why is better to use a Jacketed vessel in the dairy industry than a stainless steel container directly?
15. Statement 1: The heat transfer co-efficient in ice is four times that of water.

Statement 2: k in conductance is for thermal conductivity.
16. Statement 1: Film-type condensation has a higher heat transfer co-efficient than drop-wise condensation.

Statement 2: Drop-wise condensation is easier to maintain than Film-type condensation
17. The emission of radiation by any body is independent of the radiation by any body next to it.
18. In deep freezers, the walls absorb heat from food materials by _____ and keep them cool.
19. A food industry keeps food cool in a very crude manner, by radiation. It paints its walls white and not black, because of _____
20. Statement 1: When heat transfer takes between a solid surface and a fluid, an insulating film layer is formed. More is the agitation; more is the thickness of the film.

Statement 2: Within the film, the temperature varies from the wall to the temperature of the bulk.
21. Statement 1: Unsteady state heat transfer equation can be used when there is negligible internal resistance.

Statement 2: Unsteady state heat transfer equation can be used for liquid food items which are well stirred, because, temperature gradient within won’t be there.
22. __________ is when nucleate boiling transforms to film boiling.
23. Dittus-boelter equation is applicable for fluids with phase change.
24. Statement 1: NPr= (Cpm)/kl

Statement 2: Stanton number is a product of NRe and NPr.
25. 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 hr (radiative heat transfer co-efficient) as 0.227.
ε = ( Tav/100 )3

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