Question 51 : One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to
1. evaporate the water.
2. heat the water from 0°C to 100°C.
3. to superheat the steam.
4. data insufficient, can't be predicted
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Question 52 : To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is
1. 2-4 heat exchange
2. 1-1 heat exchanger
3. 1-2 heat exchanger
4. 3-2 heat exchanger
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Question 53 : In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the
1. tube diameter
2. tube layout
3. no. of baffles
4. tube pitch
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Question 54 : Correction is applied to LMTD for __________ flow
1. parallel
2. cross
3. counter
4. none of these
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Question 55 : Mode of heat transfer involved in the cooling of air cooled internal combustion engine is
1. conduction
2. natural convection
3. none of these
4. forced convection
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Question 56 : Which is the most suitable for the concentration of foamy & frothy liquors ?
1. Long tube vertical evaporator
2. Open pan evaporator
3. Agitated film evaporator
4. None of these
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Question 57 : Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that
1. boundary surfaces are isothermal.
2. material is anisotropic.
3. constant temperature gradient exists.
4. there is no internal heat generation.
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Question 58 : In natural convection heat transfer, the correlating parameter is the
1. Graetz number
2. Eckert number
3. Grashoff number
4. Bond number
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Question 59 : Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.
1. 6
2. 7
3. 4
4. 1
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Question 60 : Boiling of milk in an open vessel is an example of __________ boiling.
1. film
2. sub-cooled
3. none of these
4. saturated nucleate
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