Electrical Power Plant

A deep well pumps water into an open reservoir at the rate of 100 gpm. The water table is 200 ft below the output pipe. The system has an overall efficiency of 70%. What shall be the minimum hp of the pump?

A pump requires 100 hp to move water with a specific gravity of 1.0 at a certain flow rate to a given elevation. What horsepower does the pump require if the flow rate and elevation conditions are the same but the fluid pumped has a specific gravity of 0.8?

An electric motor is used to pump water from a well 40 ft deep. The amount of water pumped per hour to the ground level is 237,000 gallons. What is the Hp of the motor assuming there is no power loss?

A pump, driven by 440 V, 3-phase induction motor lifts 1,100 cubic feet of water per minute against a total head of 100 ft of water. The efficiency of the pump and that of its motor are 0.75 and 0.92 respectively. The power factor of the motor is 0.9. Calculate the cost of operating the pump for 24 hours a day duty when power costs P 0.30 per kW-hr.

Calculate the current taken by a motor at 440 V having an efficiency of 90%. Moreover the motor is used to drive a pump, which lifts 240,000 kg of water per hour to a height of 30 meters. The pump is given to be 80% efficient.

A three-phase motor driven pump at 1,800 rpm is discharging 500 gpm of water at a head of 25 meters. The pump efficiency is 75%. Determine the hp of the motor.

A hydroelectric station has a turbine efficiency of 80% and a generator efficiency of 85%. Determine the volume of water required when delivering a load of 40 MW for 6 hours if its effective head is 120m. Water weighs \(1200\text{ kg/m}^3\).

A 100 MW hydroelectric station is supplying full load for 10 hrs. in a day. Calculate the volume of water, which has been used. Assume effective head of the water as 200 m and the overall efficiency of the station as 80%. Assume \(1\text{ m}^3\) of \(\text{water} = 1000\text{ kg}\).

A farmer has a small stream on his property, which he thinks might supply enough power to light his farm load. The stream was found to be flowing at \(0.05\text{ m}^3\text{/sec}\). The available fall is 5 m. A small hydraulic turbine and generator will have a combined efficiency of 75%. Assuming a transmission line efficiency of 82%, how many 50-W lamps can be served by the generator simultaneously?

Maria Cristina falls located at south has a height of 100 meters, it discharges at constant rate \(2.5\text{ m}^3\text{/sec}\). National Power corporation has construct a hydroelectric plant below the water falls. If the turbine efficiency is 70% and generator efficiency is 90%, calculate the annual energy in kW-hr, if the discharge rate is constant throughout the year. Assume specific gravity constant.

A natural waterfall, 50 meters high, consistently discharges \(1.3\text{ m}^3\) per second. A mini hydroelectric plant is to be constructed at the bottom of the waterfalls. Calculate the annual energy in kW-hr that can be generated by the power plant. Assume the turbine and generator efficiencies equal to 70% and 90%, respectively.

A water turbine operating at 85% efficiency is under a head of 100 m. If the constant discharge is 1000 gal/sec, evaluate the operating speed of the turbine.

A mini-hydroelectric power plant is under a head of 275 feet. The turbine efficiency is 0.85 and the generator efficiency is 0.80. If the turbine speed is limited to 450 rpm, calculate the generator kW output.

A power plant has a fuel consumption of 1 pound per kW-hr generated. Determine the heating value of the fuel used in BTU per pound. The overall efficiency of the plant is 36%.

A 100 MW thermal plant has an overall efficiency of 34%. If the coal used has a heating value of 10,800 BTU per pound, calculate the coal consumption of the plant per kW-hr output.

A power plant has an overall efficiency of 30%. If this plant can consumed 4200 kilograms of coal per hour, estimate the total electric energy produced in one day? Assume the calorific value of the coal being used is 8000 kcal per kilogram.

A plant has a total operating capacity of 800 kW. The coal consumption is 1900 lbs per hour. Heating value of coal is 9,500 BTU per lb. What approximate percent of the heat in the coal is converted into useful energy?

A diesel generator set burns diesel with a heating value of 18,000 BTU per pound. The diesel engine has an efficiency of 30% and the alternator has an efficiency of 95%. Determine the fuel cost component of producing one kW-hr if diesel costs P 2.80 per pound.

A diesel electric generating unit supplies a load at 70 kW. The heating value of the oil used is 12,000 kcal per kg. If the overall efficiency of the unit is 40%, determine the mass of oil required per hour.

A 500 kW electric lighting cost P 1000 per kW installed. Fixed charges are 14%, operating cost is P 1.50 per kW-hr. The plant averages 150 kW for 5000 hrs of the year, 420 kW for 1000 hrs and 20 kW for the remainder. What is the unit cost production of electric energy?