Which of the following tasks is likely to be performed by someone other than an
EST?*

1.installing cable support structures in pathways

2.repairing high-voltage power lines

3.installing outlets and connection panels

4.programming digital components

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0