Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the negative terminal and the electrode holder is earthed
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder to the positive terminal

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
Riddle is used for

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

ANSWER DOWNLOAD EXAMIANS APP