Which of the following is a heat engine?
1. Steam turbine
2. Gasoline engine
3. Wind Mill
4. Jet engine
5. Steam power plant
6. Gas turbine
7. 2 stroke engine
a. 1, 3, 5, 7
b. 2, 4, 5, 6, 7
c. 2, 4, 6, 7
d. 1, 2, 4, 5, 6, 7
e. 2, 5, 6, 7
Answer: B