101. Normalising does not ______________________ of a metal ?

A. Improve machinability & tensile strength
B. Remove internal stresses
C. Refine the structure
D. Remove strains caused by cold working

102. Material of construction of the electrode used in the electric resistance welding is___________________?

A. Stainless steel
B. Graphite
C. Copper
D. Steel

103. Which of the following is an ore dressing operation ?

A. Classification
B. Smelting
C. Roasting
D. None of these

104. Shampoos are commercially not available in the form of ___________________?

A. Powder
B. Gaseous mixture
C. Solution
D. Emulsion

105. In multipass welds, shot peening is done after each pass to__________________?

A. Close the surface porosity
B. Break the continuity of columnar grains
C. Flatten the weldment
D. Introduce texture in the weld

106. Pick out the correct combination about the role of various additives used in polymers ?

A. Plasticiser: increases the polymer strength
B. Heat stabiliser: increases the maximum service temperature
C. Fillers: Does not affect the property of polymer but increases its weight
D. Lubricants: increases the flexibility of polymers

107. Which of the following is not used as a bearing material ?

A. Copper-lead alloys
B. Babbitts
C. Bronzes
D. Cermets

108. The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?

A. Lead
B. Copper
C. Aluminium
D. Wrought iron

109. Oxide layer formed on the non-ferrous metal surface after its annealing is__________________?

A. Removed by acid pickling
B. Hammered into the surface
C. Removed with coarse emery cloth
D. Left as such to protect the surface

110. Case hardening is not done by________________?

A. Nitriding
B. Hot dipping
C. Electroplating
D. Both ‘B’ & ‘C’

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