Which of the following will not have open structure?
A 80 K 10 B 17
C 8 K 5 9 17
C 600 K 8 B 17
A 46 K 5 B 17
Correct Answer: D — A 46 K 5 B 17
Explanation:
Fourth place of ISO designation of the grinding wheel represents Structure and “5” comes under dense structure.
