Cutting Tools MCQ - Machinist(Set-1) with Answers

111) 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.

112) 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

113) Which one of the following machine reamers is used to correct the misalignment between the reamer axis and the work axis ?

Answer is:

Floating blade reamer

Explanation:

Floating blade reamer is used to correct the misalignment between the reamer axis and the work axis.

Which one of the following machine reamers is used to correct the misalignment between the reamer axis and the work axis ?

114) 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 ?

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

Answer is:

Soluble oil

Explanation:

Soluble oil are made from mineral oils with emulsifying material added to make for mixing with water. Soluble oil is diluted with water to form an emulsion. The water cools whilst the oil lubricates. The extent of dilution depends upon the type of operation.