Select the statement(s) that is (are) belong to the Carnot Principle_________ A.The efficiency of an irreversible heat engine is always greater than the efficient of a reversible one operating between the same two reservoirs. B.The efficiency of an irreversible heat engine is always less than the efficient of a reversible one operating between the same two reservoirs. C.The efficiencies of all reversible heat engines operating between the same two reservoirs are not the same. D.The efficiencies of all reversible heat engines operating between the same two reservoirs are the same. Select the statement(s) that is (are) belong to the Carnot Principle_A. The efficiency of an irreversible heat engine is always greater than the efficient of a reversible one operating between the same two reservoirs.OB. The efficiency of an irreversible heat engine is always less than the efficient of a reversible one operating between the same two reservoirs.OC. The efficiencies of all reversible heat engines operating between the same two reservoirs are not the same.D. The efficiencies of all reversible heat engines operating between the same two reservoirs are the same.

As per carnot theoremthe efficiency of carnot reversible cycle ηcarrnot=1-TLTH

Answered: Select the statement(s) that is (are)…

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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Chapter 5 no. 4
Thermodynamics 1
A steady-state system for producing power consist of a pump, heat exchanger and a turbine. Water at 1.0 bar and 20°C (state 1) enters the adiabatic pump and leaves at 10 bar (state 2). The pump draws 110 kW of power, and the mass flow rate of water is 45 kg/s. The water leaving the pump enters a heat exchanger and heated at constant pressure to 400°C (state 3) using exhaust gases (Cp of gases = 1.1 kJ/kgK) that enters at 500°C and exits at 182°C. The steam is adiabatically expanded in a turbine having an isentropic efficiency of 0.71. The turbine exhausts (state 4) to the surroundings at 1.0 bar. What is thermal efficiency of this power production process? If the pump and turbine are reversible, would the efficiency of this system equal the maximum possible efficiency? (Answer Yes or NO and provide a short explanation.)
Steam enters a counterflow heat exchanger operating at steady state at 0.07 MPa with a quality of 0.9 and exits at the same pressure as saturated liquid. The steam mass flow rate is 1.7 kg/min. A separate stream of air with a mass flow rate of 100 kg/min enters at 30°C and exits at 60°C. The ideal gas model with c, = 1.005 kJ/kg-K can be assumed for air. Kinetic and potential energy effects are negligible. Determine the temperature of the entering steam, in °C. For the overall heat exchanger as the control volume, what is the rate of heat transfer, in kW.
2. . Two reversible engines A and B operate in series. Engine A receives heat at 500 °C and rejects heat to a reservoir at temperature T. Engine B receives the heat rejected by the first engine and, in turn, rejects heat to a thermal reservoir at 20 °C. Determine the temperature T (°C) for the following situations: (i). The work outputs of the two engines are equal (ii). The thermal efficiencies of the two engines are equal
.......A gas turbine power plant is operated between 1.5 bar and 15 bar with minimum and maximum cycle temperatures of 25 C and 1420 C, respectively. Neglect the mass of the fuel. Determine the following: Work of the compressor in kJ/kg (2 decimal places) = Work of the gas turbine in kJ/kg (2 decimal places) = Heat added in the combustion chamber in kJ/kg (2 decimal places) = Net Work in kJ/kg (2 decimal places) = Thermal Efficiency in % (1 decimal place only) =
A heat engine An engine that converts power from heat operating at a steady-state receives energy by heat transfer at a rate of Qu at TH = 1200 K and rejects energy by heat transfer to a cold reservoir at a rate Qc at Tc= 360 K. (i) Calculate the Carnot cycle efficiency (ii) For each of the following cases, analyze and determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 720 kW, Qc = 144 kW (b) QH = 720 kVW, Wcycle = 360 kW, Qc = 288 kW (c) Wcycle = 714 kW, Qc = 306 kW (d) QH = 920 kW, Qc = 368 kW
7.66 Referring to the discussion of Sec. Z.6.2 as required, evaluate the exergetic efficiency for each of the following cases, assuming steady-state operation with negligible effects of heat transfer with the surroundings: a. Turbine: Wer 1200 hp, e 250 Btu//lb, eg = 15 Btu/lb, m 240 lb/min. b. Compressor: Wev/m=-105 kJ /kg, e = 5 kJ/kg, eg = 90 kJ/kg, m 2 kg /s. c. Counterflow heat exchanger: mh = 3 kg/s, me 10 kg /s, ef = 2100 kJ/kg, e = 300 kJ/kg, É = 3.4 MW 10 lb /s, m3 15 b /s, en = 1000 Btu/Ib, eg = 50 Btu/Ib, eg = 400 Btu/lb d. Direct contact heat exchanger: m1
1. Consider the following heat engines operating between 1200K and 300 K. For each case determine whether the heat engine operates reversibly, operates irreversibly, or is impossible. a. QH = 850 kJ, Qc = 300 kJ, Wnet = 550 kJ, %3| b. QH = 900 kJ, Qc = 400 kJ, Wnet = 550 kJ, %3D c. QH = 700 kJ, Qc = 140 kJ, Wnet = 560 kJ, d. QH = 800 kJ, Qc = 200 kJ, Wnet = 600 kJ.

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	A.	The efficiency of an irreversible heat engine is always greater than the efficient of a reversible one operating between the same two reservoirs.
	B.	The efficiency of an irreversible heat engine is always less than the efficient of a reversible one operating between the same two reservoirs.
	C.	The efficiencies of all reversible heat engines operating between the same two reservoirs are not the same.
	D.	The efficiencies of all reversible heat engines operating between the same two reservoirs are the same.