A cyclic machine, shown in Fig. P5.56, receives 300 kJ from a 1000-K energy reservoir. It rejects 120 kJ to a 400-K energy reservoir, and the cycle produces 180 kJ of work as output. Is this cycle reversible, irreversible, or impossible?

A cyclic machine, shown in Fig. P5.56, receives 300 kJ from a 1000-K energy reservoir. It rejects 120 kJ to a 400-K energy reservoir, and the cycle produces 180 kJ of work as output. Is this cycle reversible, irreversible, or impossible?

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

See similar textbooks

Similar questions

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.
Compare wind, solar, and power generation systems with each other and write down their advantages and disadvantages among themselves in articles.
Discuss thermal energy reservoirs, reversible and irreversible processes, heat engines, refrigerators, and heat pumps.
A closed system loses energy by heat transfer at the rate of 10KJ/s. If the system operates at steady state, explain whether work was done on the system or by the system.
A central power plant, rated at 500,000 kW, generates steam at 500 K and discards heat to a river at 300 K. If the thermal efficiency of the plant is 80% of the maximum possible value, how much heat is discarded to the river at rated power?
A water pump operating at steady state has 76 mm diameter inlet and exit pipes, each at the same elevation. The water can be modeled as incompressible and its temperature remains constant at 20°C. For a power input of 1.5 kW, determine the pressure rise from inlet to exit, in kPa at the volumetric flow rate of A m/s (A=0.015 m/s, 0.017 m/s, 0.02 m/s). Plot the A- the pressure rise from inlet to exit in graph.
Please provide complete solution with units of measurement.
An oil pump operating at steady state delivers oil at a rate of 13 lb/s through a 1-in.-diameter exit pipe. The oil, which can be modeled as incompressible, has a density of 85 lb/ft3 and experiences a pressure rise from inlet to exit of 40 lb/in². There is no significant elevation difference between inlet and exit, and the inlet kinetic energy is negligible. Heat transfer between the pump and its surroundings is negligible, and there is no significant change in temperature as the oil passes through the pump. Determine the velocity of the oil at the exit of the pump, in ft/s, and the power required for the pump, in hp. Step 1 Your answer is correct. Determine the velocity of the oil at the exit of the pump, in ft/s. V₂ = 28.064 Hint Step 2 * Your answer is incorrect. ft/s Determine the power required for the pump, in hp. Win = 1.60155105 eTextbook and Media hp Attempts: 1 of 4 used
In a piston cylinder system, a fluid at 0.8 bar occupying 0.07 m³ is compressed reversibly to a pressure of 10.2 bar and specific volume of 0.6 m³/kg according to the law p = c. The fluid then expands reversibly according to the law pv² = c to 1.1 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the net work for the process in Joules. To 3 d.p. and insert the unit symbol joules.
Define reversible work, which is the maximum useful work that can be obtained as a system undergoes a process between two specified states.
A 2.2 kW pump operating at steady state draws in liquid water at 100 kPa, 20 C and delivers it at 500 kPa at an elevation 7 meters above the inlet. There is no significant change in velocity between the inlet and exit, and the local acceleration of gravity is 9.81 m/s². Would it be possible to pump 4000 L in 10 minutes or less? Explain using considerations of generalized reversible flow processes discussed in class.
An oil pump operating at steady state delivers oil at a rate of 10 lb/s through a 1-in.-diameter exit pipe. The oil, which can be modeled as incompressible, has a density of 70 lb/ft³ and experiences a pressure rise from inlet to exit of 40 lb/in². There is no significant elevation difference between inlet and exit, and the inlet kinetic energy is negligible. Heat transfer between the pump and its surroundings is negligible, and there is no significant change in temperature as the oil passes through the pump. Determine the velocity of the oil at the exit of the pump, in ft/s, and the power required for the pump, in hp. Step 1 Your answer is correct. Determine the velocity of the oil at the exit of the pump, in ft/s. V₂ = 26.192 Hint Step 2 ft/s * Your answer is incorrect. Determine the power required for the pump, in hp. i 1.49595 hp Attempts: 1 of 4 used