8. In a two stage gas turbine plant, reheating after first stage_ a) decreases the thermal efficiency b) increases the thermal efficiency c) does not affect the thermal efficiency 9. In a two stage gas-turbine power plant, reheating after first stage_ a) increases back work ratio b) decreases back work ratio c) does not affect back work ratio 10. In a two stage gas turbine power plant, with intercooling and reheating_ a) both back work ratio and thermal efficiency improve b) back work ratio improves but thermal efficiency decreases c) thermal efficiency improves but back work ratio decreases d) none of the above 11. The cheapest plant in operation and maintenance is

8. In a two stage gas turbine plant, reheating after first stage_ a) decreases the thermal efficiency b) increases the thermal efficiency c) does not affect the thermal efficiency 9. In a two stage gas-turbine power plant, reheating after first stage_ a) increases back work ratio b) decreases back work ratio c) does not affect back work ratio 10. In a two stage gas turbine power plant, with intercooling and reheating_ a) both back work ratio and thermal efficiency improve b) back work ratio improves but thermal efficiency decreases c) thermal efficiency improves but back work ratio decreases d) none of the above 11. The cheapest plant in operation and maintenance is

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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The thermal efficiency of a heat engine operating according to the Carnot cycle is 28% and water vapor is used as the working fluid. The heat transfer to the working fluid is at a temperature of 350 ° C, and at this time, the fluid transforms from a saturated liquid to a saturated vapor. a) Calculate the degrees of dryness when the release of heat from the working fluid to the cold heat source begins and ends. b) Since 5 kg of fluid is circulating in the cycle per hour, find the power of this heat engine by using the evaporation entropy.
An adiabatic feed pump in a steam cycle delivers water to the steam generator at a temperature of 200 °C and a pressure of 10 MPaa. The water enters the pump as saturated liquid at 180 °C. If the mass flow rate of water is 20 kg/s, determine a) the discharge volume flow rate of the pump; and b) the pump power input. c) What is the percentage error if the exit conditions are assumed to be a saturated liquid at 200°C.
A regenerating brayton cycle that uses air as the fluid has a pressure ratio of 8. The minimum and maximum temperatures in the cycle are 30 ° C and 890 ° C. assuming an efficiency of 72% for the compressor, 82% for the turbine and an effectiveness of 62% for the regenerator. determine: a) the turbine air outlet temperature b) net labor output c) the thermal efficiency of the cycle
Please choose the right answer for each question as below: a): Which of the following is a path function 1-Energy 2-Entropy 3-Exergy 4-None of the above b): Moisture content of steam at the turbine exit in the power plant can be reduced by 1-Superheating of steam 2-Reheating in turbine 3-Increasing the condenser pressure 4-Through all of above methods c) The irreversibility occurs during a thermodynamic process can also be named as 1- Work produced 2- Energy change 3- Exergy destroyed 4- Exergy loss d): If the ideal vapour compression refrigeration cycle operates in a reversible mode then the process of throttling will be 1-an isentropic process 2-an isothermal process 3-an isenthalpic process 4-adiabatic process
8. In open feedwater heater a) the extracted steam is allowed to mix with feedwater b) feedwater flows trough tubes and steam is condensed outside c) steam flows outside tubes and feedwater inside d) steam flows inside tubes and outside inside 9. A Carnot cycle is to be designed to attain an efficiency of 0.75. if temperature of high temperature reservoir is 727°C, then low temperature reservoir will have to be maintained at a) 23 °C b) 181°C c) -23 °C d) -181 °C 10. Why Carnot cycle is not possible practically? 11. What is the relation between efficiencies of Rankine cycle and Carnot cycle for the same pressure ratio (for the same high and low pressures)? a. (Nrankine) = (ncarnot) b. (nRankine) > (ncarmot ) c. (Nrankine) < (nCarnot ) d. none of the above 12. What is the effect of superheated steam on efficiency of Rankine cycle? a. efficiency of Rankine cycle decreases with increase in superheat of the steam b. efficiency of Rankine cycle increases with increase in superheat of the…
7) An ideal Rankine cycle heat engine absorbs 20 kW of heat in the boiler at a constant temperature of 700 K, and the condenser rejects 5 kW of heat at a constant temperature of 400 K. The system efficiency is n = 0.5. Which of the following statements are true? a) This cycle is possible b) This cycle is not possible because it breaks the First Law of Thermodynamics c) This cycle is not possible because it breaks the Second Law of Thermodynamics d) This cycle is not possible because it breaks the First and Second Laws of Thermodynamics
2] An adiabatic feed pump in a steam cycle delivers water to the steam generator at a temperature of 200 oc and a pressure of 10 MPaa. The water enters the pump as saturated liquid at 180 °C. 1f the mass flow rate of water is 20 kg/s, determine a) the discharge volume flo rate of the pump; and b) the pump power input. c) What is the percentage error if the exit conditions are assumed to be a saturated liquid ant 200 C.
A steam power plant operates between the pressure limit of 3.0 Mpa for the boiler and 40 kPa for the condenser. If the plant operates in an ideal Rankine cycle with superheated vapor enters the turbine at 3 Mpa and 500 oC, determine:a) the moisture content at the inlet of the condenser,b) the net work per unit mass of steam flowing, in kJ/kg,c) the heat transfer to the steam in the boiler in kJ per kg of steam,d) the thermal efficiency,e) the heat transfer to cooling water passing through the condenser, in kJ per kg of steam flowing. h1 (kJ/kg) Format : 227.25 v1 (m3/kg) Format : 0.002092 h2 (kJ/kg) Format : 320.445 h3 (kJ/kg) Format : 8765.2 s3 (m3/kg) Format : 4.7267 x4 Format : 0.959 h4 (kJ/kg) Format : 7845.82 W (kJ/kg) Format : 555.79 Qin (kJ/kg) Format : 6362.75 Efficiency (%) Format : 50.83
In an ideal Reheat cycle , the steam throttled condition is 7 Mpa and 460 C. The steam is then reheated to 1.5 MpA and 460 C . If turbine exhaust is 50 C ,determine the following: A.) Quality after turbine expansion B.) Turbine work C.) Heat added in the boiler D.) Heat rejected from the condenser E.) Pump work F.) Net work G.) Cycle efficiency
An ideal Ericsson cycle operates between 1000 ° C and 80 ° C temperature limits. The highest and lowest pressures of the cycle are 252 kPa and 70 kPa, respectively. Accepting that specific heats do not change with temperature; a)Find the amount of heat (kJ / kg) entering the cycle. b)Find the thermal efficiency of the cycle c)Find the heat output (kJ / kg) out of the loop. Cp = 1.005 kJ/kg.K, c, = 0.718 kJ/kg.K, R= 0.287 kJ/kg.K, k =1.4
The highest and lowest pressures of the cycle are respectively 252 kPa and 70 kPa. Accepting that specific heats do not change with temperature; a) Find the amount of heat (kJ / kg) entering the cycle. b) Find the thermal efficiency of the cycle. c) Find the heat output (kJ / kg) out of the loop. (cp = 1.005 kJ/kg.K, c, = 0.718 kJ/kg.K, R = 0.287 kJ/kg.K, k =1.4)
A Brayton cycle with an air-powered regenerator has a pressure ratio of 8. The lowest and highest temperatures of the cycle are 310 K and 1150 K. The adiabatic efficiencies of the compressor and turbine are 75% and 82%, respectively. The efficiency of the regenerator is 65%. Draw the T-s diagram of the cycle. a) The temperature of the air at the turbine exit, b) the net work of the cycle, c) Calculate the thermal efficiency of the cycle. Consider the variation of specific heats with temperature.