Heat Transfer Equipment, Microwave Heating, Evaporation, Diffusion and Mass Transfer and Dehydration

This is an MCQ-based quiz on the topic of Heat Transfer Equipment, Microwave Heating, Evaporation, Diffusion and Mass Transfer and Dehydration.

This includes the following:-

  1. Jacketed vessel

  2. Scrapping

  3. Non-Newtonian fluids

  4. Diffusion coefficient

  5. Distribution coefficient

Start Quiz

Which of the following sentences is true?

Direct heating has higher heat transfer rates than indirect heating Indirect heating has higher heat transfer rates than direct heating Both of them have the same heat transfer rates Cannot be determined

If _______ heating has higher heat transfer rates than _______ heating, then why is ________ difficult to be used.

Direct, Indirect, no difficulty, they’re used Direct, Indirect, coil is difficult to clean and is prone to bacterial growth Indirect, Direct, no difficulty, they’re used Indirect, Direct, coil is difficult to clean and is prone to bacterial growth

In a jacketed vessel, the only way to increase the heat transfer rates is to increase the temperature difference.

True False

Which of the following is an advantage of using pumps as heat transfer equipment?

No stirrer required Taking them to a heat exchanger where the area used for heat transfer can be easily changed No stirrer required & taking them to a heat exchanger where the area used for heat transfer can be easily changed None of the mentioned

External heat exchangers are gaining popularity as they’ve several advantages over conventional methods. Still, there is a major drawback. Which among the following is it?

Some shear-sensitive cells might get damaged due to abrasion It is difficult for pumps to withstand high temperature without leakages of the fluid All of the mentioned None of the mentioned

Which of the following is a parameter to be checked before choosing the shape of the pitch in heat exchangers?

Easiness to clean High heat transfer Cost All of the mentioned

Statement 1: Difference between 1-1 and 1-2 heat exchanger is that 1-2 has both counter AND co current, whereas 1-1 has only co-current. Statement 2: 1-2 heat exchanger requires a high pressure drop.

True, False True, True False, False False, True

Statement 1: Generally, in small scaled jacketed pans, food products like jams, sauces etc are made. Statement 2: Baffles provide structural support to tubes, but they cannot prevent channeling.

True, False True, True False, False False, True

Statement 1: Scraping improves heat transfer co-efficient by 5 times in case of non-Newtonian fluids. Statement 2: In food industry, major physical changes to food items when they’re processed, take place like transformation from Newtonian to Non-Newtonian fluids. Hence, scraped surface heat exchangers are very beneficial.

True, False True, True False, False False, True

Which of the following is untrue about scraped surface heat exchangers?

They’re unsuitable for viscous fluids They’re suitable for fouling fluids They’re used for continuous operation and have a double pipe None of the mentioned

Which of the following heat exchangers are used for the quick exchange of heat?

Shell and tube heat exchangers Plate heat exchangers Scraped surface heat exchangers Jacketed Vessels

Statement 1: Plate heat exchangers are used in heat sensitive foods like milk. Statement 2: Principle behind plate heat exchangers is that there is very less space between the plates and hence quick heating can take place.

True, False True, True False, False False, True

Which of the following is true about Plate heat exchangers?

They’re used for Ultra high temperature treatment Used for high temperature and short time They’re used for Ultra high temperature treatment and also Used for high temperature and short time None of the mentioned

Contamination takes place to high extend in Plate heat exchangers.

True, the space between plates is too less False, they cannot be used for viscous liquids Cannot be determined True, they can be used for thin liquids only

Statement 1: In coiled heat exchanger, the coils can be present inside and outside the vessel. Statement 2: The coils can have either hot/cold fluid present inside them or even electrical coils can be present.

True, False True, True False, False False, True
Quiz/Test Summary
Title: Heat Transfer Equipment, Microwave Heating, Evaporation, Diffusion and Mass Transfer and Dehydration
Questions: 15
Contributed by:
NEO