Various amplifier and load combinations are measured as listed below using rms values. For each, find the voltage, current, and power gains (Av, Ai, and Ap, respectively) both as ratios and in dB: a. Vi= 100mV; i=100μA ; vo =10V ; RL= 100Ω
b. Vi= 10μV; i=100nA ; vo =1V ; RL= 10kΩ
c. Vi= 1V; i=1mA ; vo =5V ; RL= 10Ω

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk