Estimate the electric power available from the plant
At a hydroelectric power plant, the water pressure head is at a height of 300 m and the water flow available is 100 m3 s-1. If the turbine generator efficiency is 60%, estimate the electric power available from the plant (g= 9.8 m s-2).
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In any ac circuit, is the applied instantaneous voltage equal to the algebraic sum of the instantaneous voltages across the series elements of the circuit? Is the same true for rms voltage?
Refrigerant 134a undergoes a constant pressure process from saturated vapor at -18.8°C to a final temperature of 20°C. Determine the work for the process, in kJ per kg of refrigerant.
Determine the mass of the water and the magnitude and direction of the work and heat transfer for the process. Sketch the process on a p-v diagram.
A power transmission line feeds input power at 2300 V to a stepdown transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?
Determine the final temperature of the water. Use the incompressible substance model for the water and the copper with specific heats of c of the copper = 0.385 kJ/(kg x K).
Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmis
Resolve a vector A which has a magnitude of 50 units and a direction of 210 degrees into two vetors B and C. C is to be 37.5 units and is to be directed at 75 degrees.
There is no friction, and the tension in the cord is just sufficient to make the contact force between C1 and C2 zero. Find: a) the tension in the cord, b) the force exerted by the ground on C1, c) the normal force between C1 and C3.
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