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

Extrusion
Hot piercing
Cold heading
Cold peening

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
For arc welding

Direct current is used
Alternating current with low frequency is used
Alternating current with high frequency is used
Any one of these

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
Riddle is used for

Cleaning the moulding sand
Moistening the sand around the edge before removing pattern
Smoothing and cleaning out depressions in the mould
Reinforcement of sand in the top part of moulding box

ANSWER DOWNLOAD EXAMIANS APP