Give the characteristic values of the input noise generators of an amplifier with amplification of 100 if, at grounded input, the output noise is characterized in the catalog as 5 microVolt/Hz0.5 ; and, with 100 kOhm generator resistance, the output noise is 500 microVolt/Hz0.5 , at the following extra condition:

1. Suppose that the input impedance is infinite.
2. Suppose that the input impedance is 100 kOhm.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.