An engine with an electronic ignition system will not start. There is no spark at any of the ignition coils. Technician A says the crankshaft position sensor serves as a triggering device for this ignition system. A faulty crankshaft position sensor will result in this no start condition. Technician B says the engine's crankshaft position sensor requires a triggering wheel or tone ring to function properly. Who is correct

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.