Find the convection coefficient (h) associated with airflow over the surface of a thick, stainless steel casting. thermocouples are inserted into the casting at distances of 10 mm and 20mm from the surface along a hypothetical line normal to the surface. the steel has a thermal conductivity of 15 w/m-k. the therm

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?