89. Downhill method of welding of pipe is done while welding
A. a thin walled pipe by rolling
B. a thin walled pipe in fixed position
C. a thick walled pipe by rolling
D. a thick walled pipe in fixed position
90. In which pipe welding position all positional welding is required to be done?
A. 1G ( Rolling )
B. 2G
C. 5G
D. 1G (segmental )
91. Which property of cast iron makes it difficult to weld cast iron?
A. high compressive strength
B. hardness and brittleness
C. low melting point
D. low fluidity
92. The type of electrode selected for welding cast iron with mild steel plate is…
A. M.S. electrode
B. bronze electrode
C. low hydrogen electrode
D. stainless steel electrode
93. Name the solution used for cleaning the copper sheets during pickling
A. diluted nitric acid
B. diluted sulphuric acid
C. diluted hydrochloric acid
D. diluted carbon tetra chloride