Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following two processes:a. A hea...
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Consider the following two processes:
a. A heat source at 1200 K loses 2500 kJ of heat to sink at 800 K
b. A heat source at 800 K loses 2000 kJ of heat to sink at 500 K
Which of the following statements is TRUE?
- a)Process I is more irreversible than Process II
- b)Process II is more irreversible than Process I
- c)Irreversibility associated in both the processes is equal
- d)Both the processes are reversible
Correct answer is option 'B'. Can you explain this answer?
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Consider the following two processes:a. A heat source at 1200 K loses ...
**Answer:**
The irreversibility of a heat transfer process can be determined by comparing the temperatures of the heat source and the heat sink. The larger the temperature difference, the more irreversible the process.
Let's analyze the two processes:
**Process I:**
Heat source temperature (Th1) = 1200 K
Heat sink temperature (Tc1) = 800 K
**Process II:**
Heat source temperature (Th2) = 800 K
Heat sink temperature (Tc2) = 500 K
To determine which process is more irreversible, we need to compare the temperature differences for each process.
**Temperature Difference for Process I:**
ΔT1 = Th1 - Tc1 = 1200 K - 800 K = 400 K
**Temperature Difference for Process II:**
ΔT2 = Th2 - Tc2 = 800 K - 500 K = 300 K
Comparing the temperature differences, we can see that ΔT1 > ΔT2. This means that the temperature difference in Process I is larger than in Process II.
From the above analysis, we can conclude that:
**Process II is more irreversible than Process I (Option B is correct)**
The larger temperature difference in Process I indicates that it is a more efficient process, as more work can be extracted from the heat transfer. In contrast, the smaller temperature difference in Process II suggests that it is less efficient and more energy is wasted.
It is important to note that both processes involve heat transfer from a higher temperature to a lower temperature, which is an irreversible process according to the second law of thermodynamics. However, Process I is comparatively more efficient than Process II due to the larger temperature difference.
The irreversibility of a heat transfer process can be determined by comparing the temperatures of the heat source and the heat sink. The larger the temperature difference, the more irreversible the process.
Let's analyze the two processes:
**Process I:**
Heat source temperature (Th1) = 1200 K
Heat sink temperature (Tc1) = 800 K
**Process II:**
Heat source temperature (Th2) = 800 K
Heat sink temperature (Tc2) = 500 K
To determine which process is more irreversible, we need to compare the temperature differences for each process.
**Temperature Difference for Process I:**
ΔT1 = Th1 - Tc1 = 1200 K - 800 K = 400 K
**Temperature Difference for Process II:**
ΔT2 = Th2 - Tc2 = 800 K - 500 K = 300 K
Comparing the temperature differences, we can see that ΔT1 > ΔT2. This means that the temperature difference in Process I is larger than in Process II.
From the above analysis, we can conclude that:
**Process II is more irreversible than Process I (Option B is correct)**
The larger temperature difference in Process I indicates that it is a more efficient process, as more work can be extracted from the heat transfer. In contrast, the smaller temperature difference in Process II suggests that it is less efficient and more energy is wasted.
It is important to note that both processes involve heat transfer from a higher temperature to a lower temperature, which is an irreversible process according to the second law of thermodynamics. However, Process I is comparatively more efficient than Process II due to the larger temperature difference.
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Consider the following two processes:a. A heat source at 1200 K loses 2500 kJ of heat to sink at 800 Kb. A heat source at 800 K loses 2000 kJ of heat to sink at 500 KWhich of the following statements is TRUE?a)Process I is more irreversible than Process IIb)Process II is more irreversible than Process Ic)Irreversibility associated in both the processes is equald)Both the processes are reversibleCorrect answer is option 'B'. Can you explain this answer?
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Consider the following two processes:a. A heat source at 1200 K loses 2500 kJ of heat to sink at 800 Kb. A heat source at 800 K loses 2000 kJ of heat to sink at 500 KWhich of the following statements is TRUE?a)Process I is more irreversible than Process IIb)Process II is more irreversible than Process Ic)Irreversibility associated in both the processes is equald)Both the processes are reversibleCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Consider the following two processes:a. A heat source at 1200 K loses 2500 kJ of heat to sink at 800 Kb. A heat source at 800 K loses 2000 kJ of heat to sink at 500 KWhich of the following statements is TRUE?a)Process I is more irreversible than Process IIb)Process II is more irreversible than Process Ic)Irreversibility associated in both the processes is equald)Both the processes are reversibleCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following two processes:a. A heat source at 1200 K loses 2500 kJ of heat to sink at 800 Kb. A heat source at 800 K loses 2000 kJ of heat to sink at 500 KWhich of the following statements is TRUE?a)Process I is more irreversible than Process IIb)Process II is more irreversible than Process Ic)Irreversibility associated in both the processes is equald)Both the processes are reversibleCorrect answer is option 'B'. Can you explain this answer?.
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