1.1. Vapor feed to an adiabatic tubular reactor is heated to about 700F in a furnace as shown in the Figure below. The fuel gas provides the necessary heat in the furnace. The reaction is endothermic. The exit temperature of gas leaving the reactor is to be controlled at 600F. It is assumed that the vapor feed flow may fluctuate and can be measured but the operator has no control over it. By means of a diagram, show how you would achieve the control objective using: a) Feedback control b) Feedforward control In each case, state the control objective, the controlled variable, the manipulated variable and the disturbance [16 marks]