A unibody strut tower is being installed using a GMAW (MIG) welder. Technician A says that a mixture of 75% argon and 25% carbon dioxide
could be used.
Technician B says that a mixture of 75% argon and 25% helium could
be used
Who is right?
* (A) A only (C) Both A and B
(B) B only (D) Neither A nor B

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

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

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.