Grinding MCQ - Machinist(Set-1) with Answers

16) Which one of the following features, refers to vitrified bond wheel ?

Answer is:

Suitable for wet and dry grinding

Explanation:

vitrified bond wheel is suitable for wet and dry grinding.

Which one of the following features, refers to vitrified bond wheel ?

17) You have to select a grinding wheel with suitable abrasive to grind glass. What is the type of abrasive you will select ?

Answer is:

Diamond

Explanation:

Grinding wheel with diamond abrasive is suitable for grinding glass.

You have to select a grinding wheel with suitable abrasive to grind glass. What is the type of abrasive you will select ?

18) Dressing and truing of a grinding wheel are

Answer is:

Done with the same equipment

Explanation:

DressingThe purpose of dressing is to restore the correct cutting action of the wheel. Dressing removes the clogs on the surface of the wheel and the blunt grains of the abrasive, exposing the new sharp abrasive grains of the wheel which can be cut and brought to shape efficiently.
TruingTruing refers to the shaping of the wheel to make it run concentric with the axis. When a new grinding wheel is mounted, it must be trued before use. The cutting surface of a new wheel may run out slightly due to the clearance between the bore and the machine spindle. Grinding wheels, which are in use, also can run out of true, due to uneven loading while grinding.
Dressing and truing are done at the same time using same tool.

Dressing and truing of a grinding wheel are

19) A hardened die block (work) has to be ground. It is required to retain the same hardness even after grinding. If the work is overheated in the grinding process, it may result in work being rejected or scrapped. Probable reason for rejection is that the wor

Answer is:

Softened

20) Which one of the following cutting fluids is used during grinding mild steel ?

Answer is:

Soluble oil

Explanation:

Soluble Oils are metalworking fluid concentrates containing a high percentage of oil (usually greater than 50%). When mixed with water, they form an emulsion that has a milky appearance. The high oil content provides excellent physical lubricity for the cutting operation as well as protection for the machine tool.