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21
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of
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Answer: Option C
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22
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is
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Answer: Option B
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23
Harmonic mean temperature difference is given by
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Answer: Option B
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24
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?
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Answer: Option C
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25
For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy
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Answer: Option B
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26
Among liquids, water has a comparatively high value of thermal conductivity, due to its
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Answer: Option C
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27
Evaporation by thermocompression results in the
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Answer: Option C
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28
Which of the following is directly concerned with the heat transfer?
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Answer: Option D
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29
Evaporator tubes are generally
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Answer: Option B
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30
Boiling of milk in an open vessel is an example of __________ boiling.
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Answer: Option A
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