# Chemical Engineering Questions and Answers – Efficiency

This set of Basic Chemical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Efficiency”.

1. Energy out and Energy in of a system are 10 J and 25 J respectively, what is the efficiency of the system?
a) 10%
b) 40%
c) 50%
d) 80%

Explanation: Efficiency = 10/25*100 = 40%.

2. Energy out and Energy in of a system are 5 J and 25 J respectively, what is the efficiency of the system?
a) 20%
b) 40%
c) 60%
d) 80%

Explanation: Efficiency = 5/25*100 = 20%.

3. Energy out and Energy in of a system are 10 J and 20 J respectively, what is the efficiency of the system?
a) 20%
b) 30%
c) 40%
d) 50%

Explanation: Efficiency = 10/20*100 = 50%.

4. Energy out and Energy in of a system are 40 J and 25 J respectively, what is the efficiency of the system?
a) 40%
b) 80%
c) 160%
d) 200%

Explanation: Efficiency = 40/25*100 = 160%.

5. Energy out and Energy in of a system are 15 J and 25 J respectively, what is the efficiency of the system?
a) 40%
b) 60%
c) 80%
d) 110%

Explanation: Efficiency = 15/25*100 = 60%.

6. What is the efficiency of the system, if the actual work output from the process is 10 J and work output for a reversible process is 40 J?
a) 10%
b) 25%
c) 40%
d) 65%

Explanation: Efficiency = 10/40*100 = 25%.

7. What is the efficiency of the system, if the actual work output from the process is 20 J and work output for a reversible process is 25 J?
a) 10%
b) 20%
c) 40%
d) 80%

Explanation: Efficiency = 20/25*100 = 80%.

8. What is the efficiency of the system, if the actual work output from the process is 15 J and work output for a reversible process is 20 J?
a) 25%
b) 50%
c) 75%
d) 100%

Explanation: Efficiency = 15/20*100 = 75%.

9. What is the efficiency of the system, if the actual work input from the process is 10 J and work input for a reversible process is 20 J?
a) 20%
b) 50%
c) 100%
d) 200%

Explanation: Efficiency = 20/10*100 = 200%.

10. What is the efficiency of the system, if the actual work input from the process is 20 J and work input for a reversible process is 25 J?
a) 20%
b) 80%
c) 125%
d) 150%

Explanation: Efficiency = 25/20*100 = 125%.

11. What is the efficiency of a heat engine with heat input 10 J and work output 7 J?
a) 30%
b) 70%
c) 100%
d) 140%

Explanation: Efficiency = 7/10*100 = 70%.

12. What is the efficiency of a heat engine with heat input 20 J and work output 5 J?
a) 25%
b) 50%
c) 75%
d) 100%

Explanation: Efficiency = 5/20*100 = 25%.

13. What is the efficiency of a heat engine with heat input 5 J and work output 8 J?
a) 40%
b) 80%
c) 160%
d) 200%

Explanation: Efficiency = 5/8*100 = 160%.

14. What is the coefficient of performance of a system, if its work input is 50 J and heat removed is 35 J?
a) 35%
b) 50%
c) 70%
d) 95%

Explanation: Coefficient of performance = 35/50*100 = 70%.

15. What is the coefficient of performance of a system, if its work input is 75 J and heat removed is 45 J?
a) 20%
b) 40%
c) 60%
d) 80%

Explanation: Coefficient of performance = 45/75*100 = 60%.

Sanfoundry Global Education & Learning Series – Basic Chemical Engineering.

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