Asingle pass cross-flow heat exchanger is used to cool jacket water (cp = 1.0 btu/lbm · °f) with inlet temperature of 100°f. both air flow and water flow are unmixed. if the water and air mass flow rates are 95,000 lbm/h and 450,000 lbm/hr, respectively, determine the log mean temperature difference for this heat exchanger.

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)

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa. s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)