The space between two parallel conducting plate each having an area S is filled with an inhomogeneous ohmic medium who e conductivity varies linearly from σ1 at one plate (y=o) to σ2 at the other plate (y=d). A d-c voltage V0 is applied across the plate Determinea) the total resistance between the plates, andb) the surface charge densities on the plate.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?