Which of the following statements about atomic vacancy sites in metals is incznrect a)- a vacancy represents the empty space in an otherwise cosed packed crystal b)- all crystalline solids contain vacancies c)-vacancy is considered as a point defect d)- vacancies play an important role in diffusion mechanisms

Acertain flow of air (at stp) has a velocity distribution given by v i (in ft/s). if this flow is going through a 4 ft square area in the yz-plane (centered at the origin), what is the mass flow rate (in lbm/s)?

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?

What is the main objective of using reheat rankine cycle?