An NMOS transistor fabricated in a technology for which k = 400µA/V and V = 0.4V is required to operate with a small as a variable resistor ranging in value from 200Ω to 1kΩ . It is required to use the smallest possible device, as limited by the minimum channel length of this technology ( = 0.18µm ) and the maximum allowed voltage of 1.8 V. a. Specify the range required for the control voltage and the required transistor width W

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.