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A Francis turbine has the following dimensions: r1 = 4.5 m, r2 = 2.5 m, b1 = b= 0.85 m, b1 = 75°, b2 = 100°. The angular speed is 120 rpm, and the discharge is 150 m3 /s. For no separation at the entrance to the runner, determine the guide vane angle, theoretical torque, head, and power.
A large fraction of the thermal energy generated in the engine of a car is rejected to the air by the radiator through the circulating water. Should the radiator be analyzed as a closed system or as an open system? Explain.
The diameter ofthe coil of reeled hose is 300 mm, and the weight ofthe loaded reel and its frame may be neglected. Notethat force P is perpendicular to OD. State anyassumptions.
A living plant leaf is an open system that exchanges energy (sunlight and thermal flows) + matter (O2, CO2, water vapor, etc.) with the surroundings (the exterior). Even with irreversible processes (energy dissipation) we find that the net entropy ch..
A radiator wall measuring 2 m by 3 m (WxH) is held a temperature of 125 °C. Straight aluminum fins (k = 175 W/mK) are to be mounted on the wall. The fins are 5 cm in length and 0.8 mm thick. The system is allowed to convectively transfer heat to ambi..
There is no significant heat transfer between the engine and its surroundings, and kinetic and potential energy effects are negligible. For operation at steady state, determine the rate at which power is developed in the absence of internal irreve..
boom ab is held in the position shown by three cables. knowing that the tensions in cables ac and ad are 4 kn and 5.2
The stakes at points A, E, and F may be modeled as pins, and the weights of all members except the concrete may be neglected. If the concrete is modeled as a fluid with 90 lb/ft3 specific weight, determine the force supported by members BC and DF.
Estimate (a) the wing span, (b) the aspect ratio, and (c) the induced drag. Take density of air to be 0.7 Kg/m3. Assume that the factors for induced drag and the lift slope, d and t, respectively, are equal to 0.01; i.e., d = t = 0.01.
On a single graph, plot "Hardness" as the ordinate versus "Aging Time" as the abscissa for each aging temperature - Discuss the effect of aging time and temperature on the effect of material hardness.
If the machine is being operated at a speed of 1710 rpm and the frequency of the fundamental component of the applied voltages is 60 Hz, plot the torque versus duty cycle as the duty-cycle d is varied from 0 to 5.
A piston-cylinder device contains helium gas initially at 150 kPa, 20 degrees C, and 0.4 m^3. The helium is now compressed in a polytropic process (PV^n = constant) to 400 kPa and 140 degrees C. Determine the heat loss or gain during this process.
saturated vapor at 400 kia flowing in a line is taken out through a valve to 100 kpa. what is the temperature in c as
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