26. In atomic hydrogen, welding hydrogen acts as-
A. a lubricant to increase the flow characteristics of weld material
B. a heating agent
C. one of the gases to generate the flame
D. an effective shielding gas protecting the weld
27. A small amount of carbonaceous material sprinkled on the inner surface of mould cavity is called-
Read More- Theory of Machines: Simple Mechanisms-2
A. Green sand
B. Dry sand
C. Facing sand
D. Backing sand
28. What is the number of jaws in self-centered chuck?
29. USM has a good machining performance for-
C. Refractory material
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