A proposed cyclic heat engine will accept 300 J of heat from a hot reservoir at 800 K, output 250 J of work to the surroundings, and reject 50 J of heat toa cold reservoir at 300 K. According to the 2nd law of thermodynamics, which of the following statements is correct?The system is possible but irreversible.The system is impossible.The system is possible and reversible.

Answered: Image /qna-images/answer/c3ddfb9f-8999-4947-aed7-726eb2ba8051.jpg

Answered: A proposed cyclic heat engine will…

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 reversible heat engine operates between two reservoirs: one at Th = 395.0°C and another at Te = 150°C. It goes through a cycle consisting of an adiabatic compression during which it ab- sorbs 125.0 J of heat energy, followed by an isothermal expansion at Th, followed by an adiabatic expansion, followed by an isothermal compression at Te. The output of the engine is used to run a reversible refrigerator operating between the same two reservoirs, that has a cycle consisting of an adiabatic expansion, followed by an isothermal expansion at Te, followed by an adiabatic com- pression, followed by an isothermal compression at Th. The output of the engine is used to run the refrigerator. e) What is the total change in entropy of the universe in running this system?
A closed system undergoes a cycle consisting of three process 1-2, 2-3 and 3-1. Given that Q12 = 30kJ, Q23 = 10 kJ, 1w2 = 5 kJ, 3w2 = 5 kJ and DE31 = 15 kJ, Evaluate Q31, w23, DE12 and DE23.
A system executes a power cycle while receiving 1000 Btu by heat transfer at a temperature of 900oR and discharging 600 Btu by heat transfer at a temperature of 540oR. There are no other heat transfers.Determine the cycle thermal efficiency. Use the Clausius Inequality to determine σcycle, in Btu/oR. Determine if this cycle is internally reversible, irreversible, or impossible.
8Q Prove that, whenever a system undergoes a cycle, p<0 (b) T.
Water stored in a large, well-insulated storage tank at 21oC, and atmospheric pressure is being pumped at steady state from this tank by a pump at the rate of 40m3/h. The motor driving the pump supplies energy at the rate of 8.5 k.W. The water is used as a cooling medium and passes through a heat exchanger where 255 k.W of heat is added to the water. The heated water then flows to a second large, vented tank, which is 25 m above the first tank. Determine the final temperature of the water delivered to the second tank.
A heat engine operating between two reservoirs receives energy Q,=2100 KJ by heat transfer from a hot reservoir(source) at T,= 2000 K and rejects energy Q2=500 KJ by heat transfer to a cold reservoir (sink) at T2= 400 K. Determine the reversible and irreversible efficiencies of heat engine. Calculate ideal and practical efficiency To be: Q, = 2000KJ Q2 = 400KJ -Calculate the reflexive work Wrev -Calculate practical (real) work
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.)
A working fluid in a closed loop undergoes the following cycle: • 1-2 Isentropic compression • 2-3 Isobaric heat addition • 3-4 Isentropic expansion • 4-1 Isobaric heat rejection Identify the temperature-entropy (T-s) diagram that illustrates this cycle. T 2. 1 2 3 3 4 4 S 2 1 2 1 3 3 4 4 S
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
Shown below is P-V diagram for a reversible cycle enclosed by 4 reversible process curves. The curve 1-2 and the curve 3-4 are reversible isothermal processes, and the curve 2-3 and the curve 1-4 are reversible adiabatic processes. If the cycle direction is counter clockwise, answer the question below. Select curve(s) which represent process(es) having heat interactions?____ A. curve 1-2 B. curve 2-3 C. curve 1-4 D. curve 3-4

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