In the circuit below, the small-signal source vs(t) = 10 cos(100t) mV is applied to the input of the amplifier circuit consisting of MOSFETs Q1 and Q2 that have been biased to operate in saturation. Assume the transistors have Vt = 2 V and kn = 2 mA/V2. 5) Determine the amplifier configurations of Q1 and Q2 and theirtransconductances gm1 and gm2. 6) Sketch the small-signal circuit using the pi model for Q1 and T model for Q2.7) Estimate the small-signal current i(t) and voltage v(t) at the drain of Q1.8) Estimate the voltage vO(t) at the drain of Q2.5kΩ1mA

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?