Hot spots found on the cylinder bore near the exhaust valve indicate that the engine has experienced some localized overheating. technician a says that the hot spots are signs of cylinder bore damage and should be repaired through a resizing process. technician b says the hot spots are nothing more than carbon stains left by the vaporization of oil on the cylinder bore. who is correct?

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.