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
94. Which type of electrode is used for fusion welding of copper?
A. electrolyte copper
B. copper silicon electrode
C. phosphor bronze electrode
D. deoxidized copper electrode
95. The usual defect which occurs on a weld done by low heat input electrode due to improper cleaning is…
A. undercut
B. porosity
C. overlap
D. crack
96. Columbium based stainless steel electrode is used for welding stainless steel joints. The will prevent…
A. Crack in the joint
B. weld decay
C. distortion
D. spatter
97. Porosity in stainless steel weld is due to the use of…
A. short arc
B. less current
C. damp electrode
D. unstabilised electrode
98. Which one of the following is used in the oxy-arc cutting process?
A. flux coated solid electrode
B. bare wire tubular electrode
C. flux coated tubular electrode
D. bare tungsten arc cutting electrode
99. The electrode holder in a carbon arc cutting equipment is made up of…
A. plain carbon steel
B. galvanized iron
C. aluminium
D. copper
