43. What can be used as a tracing powder when checking for small oil leaks? A. Aerosol foot powder
B. Brake cleaner
C. Spray lubricant (WD-40)
D. None of the above

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

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