Which of the following statement is true
(a) Cast aluminium alloys are specified by a four digit system while wrought alloys by a five digit system
(b) Cast aluminium alloys are specified by a five digit system while wrought alloys by a four digit system
(c) Cast aluminium alloys are specified by a six digit system while wrought alloys by a five digit system
(d) Cast aluminium alloys are specified by a five digit system while wrought alloys by a six digit system
I encountered this question during a telephonic interview.
This advanced question is from the Cast Steel & Aluminium Alloys in Engineering Materials of Machine Design