The feed enters at its bubble-point temperature; vapour from the top tray enters a total condenser; the resulting liquid (distillate and reflux) leaves at its bubble point of 32 C. The reboiler operates at a temperature of 126 C and the top tray temperature is 63 C. The column operates at a pressure of 320 kPa and pressure drops may be neglected. a) Identify the key components.
b) Calculate the minimum reflux ratio.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?