Determine the effluent concentrations of S, Xa, Xi, Xv, and X (the total suspended solids) for a 10 m³ reactor operated as a chemostat that is fed 3 m³/d of wastewater containing BOD_L of 2,000 mg/l, 20 mg/l of nonbiodegradable suspended organic solids, and 15 mg/l of inorganic suspended solids.
Assume aerobic conditions exist and that Y= 0.65 mg cells/mg BOD_L, q^ = 16 mg BOD_L/d per mg cells, K = 25 mg/l, b = 0.2/d, and f_d = 0.8.

Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented