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

a) Direct, Indirect, no difficulty, they're used

b) Direct, Indirect, coil is difficult to clean and is prone to bacterial growth

c) Indirect, Direct, no difficulty, they're used

d) Indirect, Direct, coil is difficult to clean and is prone to bacterial growth

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

a) True

b) False

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

a) No stirrer required

b) Taking them to a heat exchanger where the area used for heat transfer can be easily changed

c) No stirrer required & taking them to a heat exchanger where the area used for heat transfer can be easily changed

d) None of the mentioned

5. 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?

a) Some shear-sensitive cells might get damaged due to abrasion

b) It is difficult for pumps to withstand high temperature without leakages of the fluid

c) All of the mentioned

d) None of the mentioned

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

a) Easiness to clean

b) High heat transfer

c) Cost

d) All of the mentioned

7. 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.

a) True, False

b) True, True

c) False, False

d) False, True

8. 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.

a) True, False

b) True, True

c) False, False

d) False, True

9. 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.

a) True, False

b) True, True

c) False, False

d) False, True

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

a) They're unsuitable for viscous fluids

b) They're suitable for fouling fluids

c) They're used for continuous operation and have a double pipe

d) None of the mentioned