A Simple Steam Power Plant under the conditions shown in the diagram. Neglect Kinetic Energy and Potential Energy across the power plant and neglect the heat transfer from the turbine. Choose the correct answers : The power done by the turbine = 8 MW. The heat supplied to Boiler = 25.7 MW The power done by the turbine = 12 MW The heat supplied to Boiler = 25.7 MW The power done by the turbine - 12 MW The heat supplied to Boiler = 45.7 MW The power done by the turbine = 10 MW The heat supplied to Boiler z 15.7 MW

A Simple Steam Power Plant under the conditions shown in the diagram. Neglect Kinetic Energy and Potential Energy across the power plant and neglect the heat transfer from the turbine. Choose the correct answers : The power done by the turbine = 8 MW. The heat supplied to Boiler = 25.7 MW The power done by the turbine = 12 MW The heat supplied to Boiler = 25.7 MW The power done by the turbine - 12 MW The heat supplied to Boiler = 45.7 MW The power done by the turbine = 10 MW The heat supplied to Boiler z 15.7 MW

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A Simple Steam Power Plant under the conditions shown in the diagram. Neglect Kinetic Energy and Potential Energy across the power plant and neglect the heat transfer from the turbine. Choose the correct answers The power done by the turbine = 12 MW. The heat supplied to Boiler = 25.7 MW The power done by the turbine = 10 MW. The heat supplied to Boiler = 15.7 MW The power done by the turbine 12 MW. The heat supplied to Boiler = 45.7 MW The power done by the turbine 8 MW. The heat supplied to Boiler = 25.7 MW
A certain coal-fired power plant has a rated power capacity of P = 950 MW. The output of this plant is W = 0.39QH, where QH is the energy input as heat from the hot reservoir. a. Calculate the maximum thermal efficiency of the power plant. b. Calculate the absolute value of the exhausted heat (QC) each second in MJ for the power plant. c. How many tons nC of this coal is exhausted as wasted heat to QC in a single day?
3. A simple steam power plant illustrated below uses 20 kg/s of steam. Find: a) the boiler heat transfer rate; b) the turbine power output; c) the condenser duty; d) the pump power required. What is the ratio of net power out to heat in (the thermal efficiency)? The turbine and the pump are adiabatic 2 Boiler Pump 2 3 |3|4 Stream T(°C) P(MPa) 40 40 Turbine 600 x = 1 Condenser 0.01 10 10 0.01 A
1. An engine from a quarry vehicle used in the Build a Beach program of DEMR has a power requirement of 560 kW. Per hour of its operation, it ejects 234 MJ into its surroundings at 50 °C. If it behaves like a Carnot engine, answer the questions below. A. How much work (MJ) is done by the engine per hour of operation? B. What is the efficiency (%) of the engine?C. What is the temperature (°C) of the hot reservoir? 2. Determine the entropy change (kJ/K) associated to the conversion of 10 kg of ice at -11 °C to steam at 121 °C. 3. Anna and Beth are using another rare metal, the nth metal (c = 0.600 J/g-℃), to build the 5-kg cuirass of their design. Initially, the metal is at 2250 K. It is then submerged to 10 kg of water at 15 °C. If the remaining liquid water after submerging the metal is 8.5 kg, solve for the net entropy change (kJ/K) of the system.
Air is used as a working substance in a given internal combustion engine, which is supplied with heat at a constant volume. Based on the data, calculate the The work of the cycle.
Solve and choose the correct A Simple Steam Power Plant under the conditions shown in the diagram. Neglect Kinetic Energy and Potential Energy across the power plant and (2) :neglect the heat transfer from the turbine. Choose the correct answers The power done by the turbine 12 MW. The heat supplied to Boiler 45.7 MW O The power done by the turbine 8 MW. The heat supplied to Boiler 25.7 MW O The power done by the turbine 10 MW. The heat supplied to Boiler 15.7 MW O) The power done by the turbine 12 MW. The heat supplied to Boiler 25.7 MW C P1 = P4, T1 = 500°C =8 kgs m steam Turbine turbine (Adiabatic) O P = 20 kPa X2=09 Boiler Condenser P4 10 MPa Rcond AT=10°C (max) T4 = T3 Feedwater +mwater Cooling water Pump P3 P T3 = 40°C
Steam is delivered by a steam generating unit at 1100 psia and 900 F. After expansion in the turbine to 300 psia, the steam is withdrawn and reheated to the initial temperature. Expansion now occurs to the condenser pressure of 1psia. Find:a. For an ideal engine operating through the same states, but ignoring the pressure drop in the reheater, find the work and engine efficiency. b. An actual turbine operates between these same state points except that steam enters the reheater at 300 psia, 600 F and leaves at 290 psia, 900 F. The combined steam rate is 6.3 lb/ HP-hr, the generator efficiency is 94%, and the heat loss through the turbine casing is 1% of the throttle enthalpy. Find the turbine efficiency and the approximate quality or degree SH of the exhaust steam.
A power cycle capable of delivering a power output of 410 kJ for an energy input by heat transfer of 1000 kJ. The system undergoing the cycle receives the heat transfer from hot gases at a temperature of 500 K and discharges energy by heat transfer to the atmosphere at 27 °C. Evaluate: 1 amount of aheat released from the system and thermal efficiency 2 the efficiency if the system operates in Carnot cycle. 3 draw the schematic diagram of the system.
1. A Carnot cycle has a maximum temperature of 550 °F and minimum temperature of 100 °F. If the horsepower output of the engine is 44.13, find the heat added for the cycle in BTU/s.
(4 blanks) An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 °C and rejects heat to a room at 24.0 °C. Suppose that 85.0 kg of water at 0.0 °C are converted to ice at 0.0 °C. How much energy (in Joules) must be supplied to the machine to achieve this task? Sol. Since the machine is a operating in a Carnot cycle, then, its efficiency is e = th |-| tc TH| By virtue of first law, the work done to convert water to ice is given by W = Q = ml Thus, the total energy needed to convert 85 kg of water is ET 687.5 J
2. The maximum thermal efficiency possible for a power cycle operating between 1200°F and 225°F is: The answer is 58.73%, show the solution and draw a diagram.
A refrigerator has a coefficient of performance equal to 7. If the refrigerator absorbs 137.5 J of thermal energy from a cold reservoir in each cycle, find a. the work done in each cycle in Joules, and b. the thermal energy expelled to the hot reservoir in Joules.