Q. “A roof accumulates solar heat during the day and radiates the heat at night” is an example of which of the following way of heat transfer?

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Q. Which of the following is the application of direct heating in the dairy industry?

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Q. Heat exchanger works on which of the following principle?

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Q. If the product flow rate in a plant is to be increased from 10,000 l/h to 20,000 l/h, the heat exchanger must be extended to_______ the original size, provided the flow rates of the service media are also doubled, other factors being constant.

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Q. Calculate temperature change: 20,000 l/h cheese milk (V1) is to be heated from 4°C to 34°C by 30,000 l/h hot water (V2) at 50°C. Density (r) and specific heat (cp) for milk are about 1020 kg/m³ and 3.95 kJ/kg, K and for water 990 (at 50°C) and 4.18.

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Q. The temperature difference between the two liquids is best utilized if they flow in opposite directions through the heat exchanger. This type of flow is called ________

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Q. ______________ tells how much heat passes through 1 m² of the partition per 1°C of differential temperature.

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Q. Which among the following surface promote heat transfer?

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Q. _______ Heat exchanger is needed for cream than for milk, if capacities and temperature programs are identical.

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Q. Which of the following material is used for heat transfer in the dairy industry?

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Q. The rate of buildup of fouling does not depend on which of the following?

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Q. What is the method of using the heat of a hot liquid, such as pasteurized milk, to preheat cold incoming milk?

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Q. Zigzag tube in heat treatment is used for which purpose?

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Q. Which heat exchanger used for heating and cooling viscous, sticky and lumpy products?

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Q. PHE (Plate Heat Exchanger) is more efficient in terms of heat transfer than THE (Tubular Heat Exchanger).

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Q. Which of the following is/are the category of Tubular Heat exchanger?

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Q. Heat exchanger characterized by pack of stainless steel in a frame is ________

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Q. Scraped Heat exchanger has a ______ design.

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Q. Plate heat exchanger was patented in which year?

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Q. The unwanted buildup of material on a surface is called?

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