• # question_answer Which of the following materials are used in Grinding wheel? 1. Aluminum oxide         2. Cubic boron nitride 3. Silicon carbide. Select the correct answer using the codes given below: Codes: A) 1, 2 and 3                     B) 1 and 2C) 2 and 3            D) 1 and 3.

$A{{l}_{2}}{{O}_{3}},$ BN and SiC are used in grinding wheels.