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251.

Heat exchanger works on which of the following principle?(a) Direct heating(b) Indirect heating(c) Slow heating(d) Fast heatingThis question was addressed to me in my homework.I need to ask this question from Heat Exchangers topic in portion Building Blocks of Dairy Processing of Dairy Engineering

Answer»

The correct option is (B) Indirect heating

The explanation: A heat exchanger is USED to TRANSFER heat by the indirect method. Hot water flows through ONE channel and milk through the other. Heat is transferred through the partition.
Discussion
252.

Which of the following is the application of direct heating in the dairy industry?(a) Heating curd in the manufacture of cheese(b) Solar heating(c) Heating with gamma rays(d) OxidationThe question was asked in class test.My question is from Heat Exchangers topic in division Building Blocks of Dairy Processing of Dairy Engineering

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Right answer is (a) HEATING curd in the manufacture of cheese

To explain I would say: Direct heating MEANS that the heating MEDIUM is mixed with the product. This technique is used in heating the curd in the manufacture of cheese in dairy industry.
Discussion
253.

“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?(a) Conduction(b) Convection(c) Radiation(d) FiltrationI have been asked this question during a job interview.The doubt is from Heat Exchangers in division Building Blocks of Dairy Processing of Dairy Engineering

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Right ANSWER is (c) Radiation

Explanation: Radiation is the emission of HEAT from a body which has accumulated thermal energy. In the given example the thermal energy is CONVERTED into radiant energy, emitted from the body and absorbed by other bodies which it STRIKES. ALMOST all substances emit radiant energy.
Discussion
254.

Which of the following is the time-temperature combination for Sterilization?(a) 72°C to 74°C for 15 to 20 seconds(b) 135°C to 140°C for 2 to 4 seconds(c) 63°C for 30 minutes(d) 115 – 120°C for some 20 – 30 minutesThis question was posed to me in final exam.This key question is from Heat Exchangers topic in chapter Building Blocks of Dairy Processing of Dairy Engineering

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The correct answer is (d) 115 – 120°C for some 20 – 30 minutes

To ELABORATE: Sterilization is a wet TREATMENT of canned milk PRODUCTS in an autoclave/specialized treatment chambers. HEAT to between 115°C to 121°C for 10 to 20 minutes.
Discussion
255.

Which of the following is the time-temperature combination for LTST pasteurization?(a) 72°C to 74°C for 15 to 20 seconds(b) 135°C to 140°C for 2 to 4 seconds(c) 63°C for 30 minutes(d) 57°C to 68°C for 15 minI got this question by my school principal while I was bunking the class.My question is taken from Heat Exchangers topic in division Building Blocks of Dairy Processing of Dairy Engineering

Answer» CORRECT answer is (c) 63°C for 30 MINUTES

Explanation: Low TEMPERATURE long time (LTLT) pasteurization INVOLVES heating the milk to 63°C for 30 minutes. The extended holding time causes alteration in the milk protein structure and TASTE.
Discussion