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

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.