Acoal fired boiler plant consumes 400kg of coal per hour. the boiler evaporates 3200 kg of water at 44°c into superheated steam at a pressure of 10 bar and 220°c. if the calorific value of coal is 32760 kj/kg, determine: i)-equivalent evaporation from an at 100°c ii)-thermal efficiency of the boiler.

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

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.

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)