Step 1: Understanding the properties of spark plug insulators. - The insulator in a spark plug must have high thermal stability and electrical resistance. - Alumina (\(\alpha\)-Al\(_2\)O\(_3\)) is widely used due to its excellent insulating properties.
Step 2: Selecting the correct option. Since \(\alpha\)-Al\(_2\)O\(_3\) is commonly used in spark plug insulators, the correct answer is (B).
A generalized relation for crushing is \[ \frac{d(P)}{m} = -K \frac{dD}{D^n} \] The solution for this equation leads to Rittinger's law for 'n' equal to ______.
Match the technologies in Group 1 with the entries in Group 2:
| Group 1 | Group 2 |
|---|---|
| (P) Urea manufacture | (I) Microencapsulation |
| (Q) Coal gasification | (II) Ultra-low sulphur diesel |
| (R) Controlled release of chemicals | (III) Shale oil |
| (S) Deep hydro-desulphurization | (IV) Prilling tower |
| (V) Gas hydrates | |
| (VI) Gas – solid non-catalytic reaction |