105) The metal conduits can be protected against corrosion by :

106) The non metallic conduit pipe used in wiring, should have a minimum size in diameter is :

107) The wall thickness of heavy gauge 20 mm size of conduit is :

108) The size of P.V.C. conduit pipe in diameter to be preferred for domestic wiring is :

109) While bending the conduit pipe, the minimum bending radius of conduit shall be :