Which of the following can be the cause/causes of an air-cooled compressor getting overheated during operation?
1. Insufficient lubricating oil.
2. Broken valve strip.
3. Clogged intake filter.
Select the correct answer using the code given below:
a. Only 3 b. Only 1 and 2
c. Only 2 and 3 d. 1, 2 and 3