A3-phase, 2300 v, 60 hz, 12-pole, y-connected synchronous motor has 4.5  per phase synchronous reactance and negligible stator winding resistance. the motor is connected to an infinite bus and draws 250 a at 0.8 power factor lagging. neglect rotational losses. a) determine the output power. b) determine the power to which the motor can be loaded slowly without losing synchronism. determine the torque, stator current, and supply power factor for this condition

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.