Ashell-and-tube heat exchanger is used for heating 14 kg/s of oil (cp = 2.0 kj/kg·k) from 20°c to 46°c. the heat exchanger has one shell pass and six tube passes. water enters the shell side at 80°c and leaves at 60°c. the overall heat transfer coefficient is estimated to be 1000 w/m2 ·k. calculate the rate of heat transfer and the heat transfer area.

Fluids at rest possess no flow energy. a)- true b)- false

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

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)