This set of Basic Chemical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Material Balances Problems Involving Multiple Units”.

1. What is the value of P in the following process?

a) 5 mole

b) 10 mole

c) 15 mole

d) 20 mole

View answer

Explanation: 10 + 20 = P + 10 + 5, => P = 15 mole.

2. What is the value of P in the following process?

a) 5 mole

b) 15 mole

c) 25 mole

d) 35 mole

View answer

Explanation: 10 + 20 = 5 + P, => P = 25 mole.

3. What is the value of P in the following process?

a) 5 mole

b) 10 mole

c) 15 mole

d) 20 mole

View answer

Explanation: 10 = P + 5, => P = 5 mole.

4. What is the value of F*P in the following process?

a) 25

b) 125

c) 150

d) 225

View answer

Explanation: F = 15 + 10 = 25 mole, P + 20 = F = 25, => P = 5 mole, => F*P = 125.

5. What is the value of H/P in the following process, if 2P + H = 16?

a) 1

b) 3

c) 6

d) 8

View answer

Explanation: P + 20 = H + 10, => H – P = 10, solving both equations, we get H = 12, P = 2, => H/P = 6.

Answer the following questions 6 – 10 for the diagram.

6. What is the value of B?

a) 100 Kg/hr

b) 200 Kg/hr

c) 300 Kg/hr

d) 400 Kg/hr

View answer

Explanation: Material balance for ethanol: 0.04*1000 = 0.2*B, => B = 200 Kg/hr.

7. What is the value of C?

a) 400 Kg/hr

b) 689.5 Kg/hr

c) 819.6 Kg/hr

d) 959.2 Kg/hr

View answer

Explanation: Material balance for air: 0.94*1000 = 0.98*C, => C = 959.2 Kg/hr.

8. What is the value of W?

a) 159.2 Kg/hr

b) 281.3 Kg/hr

c) 465.7 Kg/hr

d) 633.8 Kg/hr

View answer

Explanation: A + W = B + C, => 1000 + W = 200 + 959.2, => W = 159.2 Kg/hr.

9. What is the value of F?

a) 98.5 Kg/hr

b) 131.1 Kg/hr

c) 167.7 Kg/hr

d) 256.4 Kg/hr

View answer

Explanation: Material balance for ethanol: 200*0.2 = F*0.05 + D*0.98, => 5F + 98D = 4000, material balance for water: 200*0.8 = F*0.95 + D*0.02, => 95F + 2D = 16000, Solving both equations we get F = 167.7 Kg/hr.

10. What is the value of D?

a) 32.3 Kg/hr

b) 49.1 Kg/hr

c) 85.6 Kg/hr

d) 105.3 Kg/hr

View answer

Explanation: B = F + D, => 200 = 167.7 + D, => D = 32.3 Kg/hr.

11. How many independent equations are possible, if only one component exists in each stream?

a) 1

b) 2

c) 3

d) 4

View answer

Explanation: For whole process: 1 + 2 = 4 + 5, for first reactor: 1 + 2 = 3, for second reactor: 3 = 4 + 5, but if we equate second and third equation we get the first one, so there are 2 independent equations.

12. How many independent equations are possible, if two components are involved in each of streams?

a) 1

b) 2

c) 3

d) 4

View answer

Explanation: It will be just the double of the number of independent equations if there was only one component.

13. 1 has pure A and 2 has pure B and 3, 4 and 5 has mixture of A and B, how many independent equations are possible?

a) 1

b) 2

c) 3

d) 4

View answer

Explanation: It will be just twice the number when there is only one component.

14. How many independent equations are possible if each stream contains mixture of A, B and C?

a) 1

b) 3

c) 6

d) 8

View answer

Explanation: It will be just thrice the number when there was only one component.

15. How many independent equation are possible if 1 has pure A, 2 has mixture of B and C, 3 has mixture of A, B and C, 4 has pure C, 5 has mixture of A and B.

a) 1

b) 3

c) 6

d) 9

View answer

Explanation: It will be just thrice the number when there was only one component.

**Sanfoundry Global Education & Learning Series – Basic Chemical Engineering.**

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