The pump-turbine system in the figure draws water from the upper reservoir in the daytime to produce power for a city. At night, it pumps water from lower to upper reservoirs to restore the situation. For a design flow rate of 15,000 gal/min in either direction, the friction head loss is 17 ft. Estimate the power in kW (a) extracted by the turbine and (b) delivered by the pump. Water at 20°C Pump- turtine Z # 150 f 44 = 25 R

A compound shaft consists of a titanium alloy [G= 6,200 ksi] tube (1) and a solid stainless steel [G= 11,500 ksi] shaft (2). Tube (1) has a length of L₁ = 38 in., an outside diameter of D₁ = 2.25 in., and a wall thickness of t₁ = 0.130 in. Shaft (2) has a length of L₂ = 66 in. and a diameter of d₂ = 1.35 in. If an external torque of Tg = 660 lb-ft acts at pulley B in the direction shown, calculate the torque Terequired at pulley C so that the rotation angle of pulley C relative to A is zero. B TB X Tc (2) (1) 112 L₁ N

If the specific gravity of the oil SG-0.8 what should be the value of h so that the net horizontal hydrostatic force on the cylinder with diameter of D be equal to zero? D/2 water D a) h=0.75D b) h=1.25D 9h-1.5D d)h = 1.667D h-? oil

A piston/cylinder receives R1343 at 300 Pa and compresses it in a reversible adiabatic process to 1000 kPa. 60-C. Find the tempature and sketch the p-v and T-s diagrams