Question

1. a pfd is different from a bfd because it: a) is less detailed b) shows equipment and data c) uses only blocks and arrows d) calculates yield directly 22. mass balance ensures that: a) inputs = outputs plus accumulation b) yield is always 100% c) energy is conserved d) all equipment runs safely 23. if a separator malfunctions, the product will likely: a) be off - spec b) improve yield c) stay unchanged d) increase profits 24. in the example with 500 kg feed, 300 kg product, and 180 kg waste, the missing mass is: a) 20 kg b) 80 kg c) 200 kg d) none 25. what could explain the missing mass? a) extra product b) leaks or measurement errors c) more yield d) extra equipment 26. why is identifying missing mass important? a) it helps prevent safety risks b) it ensures off - spec products c) it lowers yield d) it replaces diagrams 27. if a pfd is ignored, technicians may: a) miss equipment details b) increase safety

Explanation:

Step1: Analyze question 21

PFD (Process Flow Diagram) shows detailed equipment and data compared to BFD (Block Flow Diagram). So answer is b.

Step2: Analyze question 22

Mass balance ensures inputs = outputs + accumulation. So answer is b.

Step3: Analyze question 23

If separator malfunctions, product will likely be off - spec. So answer is a.

Step4: Analyze question 24

Initial feed is 500 kg, product is 300 kg and waste is 180 kg. Missing mass = 500-(300 + 180)=20 kg. So answer is a.

Step5: Analyze question 25

Leaks or measurement errors can explain missing mass. So answer is b.

Step6: Analyze question 26

Identifying missing mass helps prevent safety risks. So answer is a.

Step7: Analyze question 27

If PFD is ignored, technicians may miss equipment details. So answer is a.

Answer:

1. b. Shows detailed equipment and data
2. b. Yield is equal outputs plus accumulation
3. a. Be off - spec
4. a. 20 kg
5. b. Leaks or measurement errors
6. a. It helps prevent safety risks
7. a. Miss equipment details