4.1 1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressureto a temperature of 300°C. Calculate the heat supplied, and the change of entropy, andshow the process on a T-s diagram, indicating the area which represents the heat flow.(415 kJ/kg; 0.8173 kJ/kg K)4.2 Steam at 0.05 bar, 100°C is to be condensed completely by a reversible constant pressureprocess. Calculate the heat rejected per kilogram of steam, and the change of specificentropy. Sketch the process on a T-s diagram and shade in the area which representsthe heat flow.(2550 kJ/kg; 8.292 kJ/kg K)4.3 0.05 kg of steam at 10 bar, dryness fraction 0.84, is heated reversibly in a rigid vesseluntil the pressure is 20 bar. Calculate the change of entropy and the heat supplied. Showthe area which represents the heat supplied on a T-s diagram.(0.0704 kJ/kg K; 36.85 kJ)4.4 A rigid cylinder containing 0.006 m' of nitrogen (molar mass 28 kg/kmol) at 1.04 bar,15°C, is heated reversibly until the temperature is 90°C. Calculate the change of entropyand the heat supplied. Sketch the process on a T-s diagram. Take the isentropic index,7, for nitrogen as 1.4, and assume that nitrogen is a perfect gas.(0.001 25 kJ/K; 0.407 kJ)4.5 1m'of air is heated reversibly at constant pressure from 15 to 300 °C, and is then cooledreversibly at constant volume back to the initial temperature. The initial pressure is1.03 bar. Calculate the net heat flow and the overall change of entropy, and sketch theprocesses on a T-s diagram.(101.5 kJ; 0.246 kJ/K)

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4.1 1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressure to a temperature of 300°C. Calculate the heat supplied, and the change of entropy, and show the process on a T-s diagram, indicating the area which represents the heat flow. (415 kJ/kg; 0.8173 kJ/kg K)

4.1 1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressure to a temperature of 300°C. Calculate the heat supplied, and the change of entropy, and show the process on a T-s diagram, indicating the area which represents the heat flow. (415 kJ/kg; 0.8173 kJ/kg K)

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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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

4.1 1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressure
to a temperature of 300°C. Calculate the heat supplied, and the change of entropy, and
show the process on a T-s diagram, indicating the area which represents the heat flow.
(415 kJ/kg; 0.8173 kJ/kg K)
4.2 Steam at 0.05 bar, 100°C is to be condensed completely by a reversible constant pressure
process. Calculate the heat rejected per kilogram of steam, and the change of specific
entropy. Sketch the process on a T-s diagram and shade in the area which represents
the heat flow.
(2550 kJ/kg; 8.292 kJ/kg K)
4.3 0.05 kg of steam at 10 bar, dryness fraction 0.84, is heated reversibly in a rigid vessel
until the pressure is 20 bar. Calculate the change of entropy and the heat supplied. Show
the area which represents the heat supplied on a T-s diagram.
(0.0704 kJ/kg K; 36.85 kJ)
4.4 A rigid cylinder containing 0.006 m' of nitrogen (molar mass 28 kg/kmol) at 1.04 bar,
15°C, is heated reversibly until the temperature is 90°C. Calculate the change of entropy
and the heat supplied. Sketch the process on a T-s diagram. Take the isentropic index,
7, for nitrogen as 1.4, and assume that nitrogen is a perfect gas.
(0.001 25 kJ/K; 0.407 kJ)
4.5 1m'of air is heated reversibly at constant pressure from 15 to 300 °C, and is then cooled
reversibly at constant volume back to the initial temperature. The initial pressure is
1.03 bar. Calculate the net heat flow and the overall change of entropy, and sketch the
processes on a T-s diagram.
(101.5 kJ; 0.246 kJ/K)

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