Sketch the low- and high-frequency cv characteristics (and explain what causes the difference) of an ideal mos capacitor with a high-k dielectric (kox = 25) for a n-type semiconductor (kox = 10). mark the accumulation, depletion, and inversion regions, and the approximate locations of flat band and threshold voltages.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]