What is a low-ductility structure that cannot easily withstand external stresses imposed on welded carbon steel structures.
A) Ferrite
B) Martensite
C) Austenite
D) Hydrogen
E) None of the above
Question 2
Select the functions that the primary control performs. You may select more than one.
A) controls ignition transformer
B) starts and stops oil burner motor
C) provides flame safety shutdown
D) provides over temperature limit protection
E) provides 24 volts to control external equipment