Hardness of a material indicates its resistance to: (a) flow of electrons (b) flow of heat (e) penetration by magnetic field (d) elastic and plastic deformation (e) penetration by nuclear radiation

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

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.