22) The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

Answer is:

cold peening

Explanation:

The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as Cold peening.

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23) the process extensively used for making bolts and nuts is

Answer is:

cold heading

Explanation:

The process extensively used for making bolts and nuts is cold heading.

24) The process of increasing the cross-section of a bar at the expense of its length is called

Answer is:

upsetting

Explanation:

1)Drawing Down: Drawing down is a process of elongate the length and reduce the cross section area of work piece. Simply in this operation, the length of work piece increases and the cross section area decreases. In this process, a compressive force is applied at perpendicular direction of its length axis. If a tensile force is applied to change its length at parallel to its length axis, this process is known as wire drawing.

2) Upsetting: Upsetting is just opposite operation to drawing down. In this operation, the length of work piece decreases and its cross section area increases. In this process, a compressive force is applied at parallel direction to its length axis.

The process of increasing the cross-section of a bar at the expense of its length is called

25) The process of decreasing the cross-section of a bar and increasing its length, is called

Answer is:

drawing down

Explanation:

1)Drawing Down: Drawing down is a process of elongate the length and reduce the cross section area of work piece. Simply in this operation, the length of work piece increases and the cross section area decreases. In this process, a compressive force is applied at perpendicular direction of its length axis. If a tensile force is applied to change its length at parallel to its length axis, this process is known as wire drawing.

2) Upsetting: Upsetting is just opposite operation to drawing down. In this operation, the length of work piece decreases and its cross section area increases. In this process, a compressive force is applied at parallel direction to its length axis.