A carrier wave is frequency-modulated using a sinusoidal signal of frequency and amplitude (a) Determine the values of the modulation index for which the carrier component of the FM wave is reduced to zero. For this calculation you may use the values of given in Appendix 3. (b) In a certain experiment conducted with and increasing (starting from zero volt), it is found that the carrier component of the FM wave is reduced to zero for the first time when What is the frequency sensitivity of the modulator

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.