Consider the following functions:
1) Minimizing friction
2) Sealing the gas between suction and discharge ports
3) As a coolant to transfer heat from the crankcase to the compressor shell
4) To dampen the noise generated by moving parts
Which of the above function do lubricants in refrigeration systems perform?
1. 1, 2, 3, and 4
2. 1 and 2 only
3. 2 and 3 only
4. 3 and 4 only