Recently, Jeff has been experiencing high voltage in his domestic power supply. He fears that this may be harmful for his family members, as the chances of electric shocks increases. He wants to decrease the power voltage in his house. Which device should Jeff use to decrease voltage for domestic power supply?
A.
power transformers
B.
distribution transformers
C.
transfer switches
D.
alternators

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.