Which of the following operations is also known as internal turning?

Explanation:

Boring is also known as Internal Turning.

Boring: 

• Boring is the process of enlarging and locating previously drilled holes with a single-point cutting tool.
• It is used to achieve greater accuracy of the diameter of a hole and can be used to cut a tapered hole as shown in the figure,

Additional Information

Milling: 

• Milling is the most common form of machining, a material removal process, which can create a variety of features on a part by cutting away the unwanted material.
• Milling is typically used to produce parts that are not axially symmetric and have many features, such as holes, slots, pockets, and even three-dimensional surface contours

Facing: 

• Facing is the operation of generating a flat surface on the LATHE machine.
• In this process, there is a removal of metal from the end of a workpiece to produce a flat surface as shown in the below figure.

Tapping: 

• The process of cutting inside thread is known as Tapping Operation.
• It is used to insert the screw or bolt can be threaded inside the hole.
• Also, it is used to make threads inside the nuts.
• Most of the Industry uses Hand tapping.