5. A vertical cylinder, which is an infinite heat source with length of 170 cm and 30 cm in diameter that has a temperature of 34 °C, transfers heat to its surroundings which is at 20 °C. Assume a heat transfer coefficient of 15 W/m2-°C. Calculate calculate the heat losses to the environment. (Assume no heat losses from the base or top of the cilynder)

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

Inadequate stores control is not an obstacle to effective work order system. (clo4) a)-true b)-false

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]