Tests on an adiabatic gas turbine (expander) yield values for inlet conditions (T1, P1) and outlet conditions (T2, P2). Assuming ideal gases with constant heat capacities, determine the turbine efficiency for: T1 = 500 K, P1 = 6 bar, T2 = 371 K, P2 = 1.2 bar, CP/R = 7/2.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.

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.