Adesigner has available voltage amplifiers with an input resistance of 10 k omh, an output resistance of 1 k ohm, and an open circuit voltage gain of 10. the signal source has a 10 k ohm resistance and provides a 5 mv rms signal, and it is required to provide a signal of at least 3v rms to a 200 ohm load. (a) how many amplifier stages are required? (b) what is the output voltage actually obtained? levels become?

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)