Q1. What is the value of exergy in general?a. only negative
b. only positive
c. sometimes positive sometimes negative
d. cannot say
View Answer / Hide Answer Q2. Exergy is not conserved but destroyed in the process. What is the reason behind this?a. reversibility
b. irreversibility
c. both reversibility and irreversibility
d. none of the above
View Answer / Hide Answer ANSWER: b. irreversibility
Q3. What does the exergy principle state?a. The exergy of an isolated system can never decreases, but always increases
b. The exergy of an isolated system can never increases, but always decreases
c. The exergy of an isolated system can either increases or decreases
d. cannot say
View Answer / Hide Answer ANSWER: b. The exergy of an isolated system can never increases, but always decreases
Q4. People use electric energy to heat and light homes. What does it indicate?a. People are destroying energy
b. People are creating energy
c. People are converting energy from more exergy value to less exergy value
d. People are converting energy from less exergy value to more exergy value
View Answer / Hide Answer ANSWER: c. People are converting energy from more exergy value to less exergy value
Q5. The ratio of minimum exergy which must be consumed to perform the task to the actual amount of energy consumed in performing the same task is called asa. first law efficiency
b. second law efficiency
c. exergy efficiency
d. none of the above
View Answer / Hide Answer ANSWER: b. second law efficiency
