A continuous flow of fluid through the system with a transfer of mechanical energy from the surroundings to the system takes place in 1-Cooler
2-Pump
3-Isolated System
4-Mechanical heat exchanger

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

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false