27) It is required to finish grind a Dia 50 mm mild steel shaft on a cylindrical grinding machine. What will be the surface speed if r.p.m. of the wheel is 191 ?

Answer is:

30 metres/min.

Grinding MCQ with Answers

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28) Which among the following is the natural abrasive ?

Answer is:

All of the above

Explanation:

Natural abrasives are
* Corrundum
* Diamond
* Emery

29) By which unit the roughness value is expressed for grinding ?

Answer is:

Micro meter

30) Which among the following is an artificial abrasive ?

Answer is:

Aluminium oxide

Explanation:

A grinding wheel consists of the abrasive that does the cutting, and the bond that holds the abrasive particles together. There are two types of abrasives.
1. Natural abrasive The natural abrasives are emery and corrundum,These are impure forms of aluminium oxide.
2. Artificial abrasive Artificial abrasives are silicon carbide and aluminium oxide.