(A) Hot worked materials are subjected to annealing to remove internal stresses

(B) Annealing of steel hardens it slightly

(C) Normalising of a material induces stresses

(D) Tempering of a material improves ductility & toughness but reduces hardness & brittleness

(A) Seam welding, projection welding & spot welding are the classification of electrical resistance welding

(B) Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)

(C) In spot welding, two pieces to be joined are overlapped and placed between two electrodes

(D) Mild steel sheet cannot be spot welded

(A) Lead can creep under its own weight at room temperature

(B) The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement

(C) Recrystallisation temperature decreases with decrease in strain in a cold worked metal

(D) With increase in temperature, the electrical conductivity of intrinsic semi-conductor will

(A) Materials exhibiting high elasticity obey Hooke’s law

(B) The elastic behaviour of rubber under compression is the same as its behaviour under tension

(C) The damping capacity of a material is due to its plastic deformation

(D) The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations

(A) Gas

(B) Arc

(C) Thermit

(D) Resistance

(A) Dryness

(B) Moisture content

(C) Coolness

(D) Latent heat

(A) Sulphur

(B) Silicon

(C) Lead

(D) Phosphorous

(A) Clamping methods

(B) Electrodes

(C) Current

(D) Filler material

(A) Chromium

(B) Vanadium

(C) Cobalt

(D) Molybdenum

(A) Power saving per unit weight of air delivered

(B) Moisture elimination in the inter-stage cooler

(C) Increased volumetric efficiency

(D) All A ,