127. Carburising flame is used to weld metals like
A.Steel
B.Copper and brass
C.Aluminium, stainless steel, zinc die castings, nickel, monel etc
D.Carburised steel

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128. Neutral flame has
A.1 zone
B.2 zones
C.3 zones
D.4 zones

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129. Carburising flame has
A.1 zone
B.2 zones
C.3 zones
D.4 zones

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130. In forehand gas welding operation, the angle between the rod and work is kept around
A.30°
B.45°
C.60°
D.75°

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131. For welding metals less than 5 mm thick, following method of gas welding would give best results
A.Forehand
B.Backhand
C.Straight hand
D.Inclined hand

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132. In the following welding technique, the flame of the torch is directed against the completed weld
A.Overhead welding
B.Horizontal welding
C.Forehand welding
D.Backhand welding

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133. The acetylene cylinder is filled with a material saturated with
A.Calcium carbide
B.Calcium oxide
C.Black carbon
D.Acetone

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