18. Which of the following is an example of rutile electrode?
a. E6013 b. E6011 c. E6010 d. E7011

19. What is the prescribed safe lens shade if the electrode size is 1/1 5/32 and amperage is 75-200 amperes?
a. # 8
b. # 10
c. # 12
d.# 14​