Question:
A system at 500 K receives 7200 kJ/min of heat from a source at 1000 K The ambient temperature is 300 K The system and source temperature remain constant during heat transfer The decrease in available energy due to heat transfer through finite temperature difference is
A system at 500 K receives 7200 kJ/min of heat from a source at 1000 K The ambient temperature is 300 K The system and source temperature remain constant during heat transfer The decrease in available energy due to heat transfer through finite temperature difference is
Show Hint
The formula ∆Q = Q x (1 − T2 / T1) helps in determining the decrease in available energy due to heat transfer
Updated On: Jan 17, 2026
- 5040 kJ/min
- 2880 kJ/min
- 2060 kJ/min
- 2160 kJ/min
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
The decrease in available energy is calculated using the formula:
\( \Delta Q = \dot{Q} \left( 1 - \frac{T_2}{T_1} \right) \)
Where: \( \dot{Q} = 7200 \, \text{kJ/min}, \, T_1 = 1000 \, K, \, \text{and} \, T_2 = 300 \, K \). After plugging in the values:
\( \Delta Q = 7200 \times \left( 1 - \frac{300}{1000} \right) = 7200 \times 0.7 = 5040 \, \text{kJ/min} \)
Was this answer helpful?
0
0
Top CUET PG Mechanical Engineering Questions
- The vacuum in a closed container is 50 mm of Hg The absolute pressure in the container is
- Consider the following statements: The assumptions made in deriving Euler’s equation are:
- Fluid is non-viscous fluid.
- The flow is along a streak line.
- Match List I (Non-dimensional number) with List II (It is the ratio of):Choose the correct answer from the options given below:
LIST I LIST II A. Reynold’s Number III. Inertia force to viscous force B. Mach Number I. Inertia force to elastic force C. Froude’s Number II. Inertia force to gravity force D. Weber’s Number IV. Inertia force to surface tension force - Given below are two statements:
Statement (A): The flow in a pipe is turbulent when the Reynolds’ Number is more than 4000.
Statement (R): The flow in a pipe is turbulent at entry and slowly changes to laminar along the length of the pipe.
In light of the above statements, choose the correct answer from the options given below: - Consider the following statements about the flow in a convergent-divergent nozzle operating under design conditions:
- In the divergent section, pressure is higher than the pressure in the convergent section.
- The pressure at the throat is equal to critical pressure.
- The pressure in the convergent section reduces.
- The flow is subsonic in the convergent section and supersonic in the divergent section.
View More Questions
Top CUET PG Thermodynamics Questions
- A thermo flask is
- 2 kg of air is contained in a closed system at a pressure of 2 bar and 0.5 m3. It undergoes an isobaric expansion till the final volume becomes 0.6 m3. The work transfer (in kJ) during the process is:
- Match List I with List II:
LIST I LIST II A. Subcooled water I. 1 bar and 134°C B. Superheated steam II. Dryness fraction = 1 and 100°C C. Steam at critical state III. 20°C and 1.01325 bar D. Saturated steam IV. 374.15°C and 220.8 bar Choose the correct answer from the options given below:
- Given below are two statements, one is labelled as Assertion (A) and the other one labelled as Reason (R):
Assertion (A): The Clausius statement of second law of thermodynamics states that it is impossible to transfer heat from a body at low temperature to a body at high temperature without the aid of external work.
Reason (R): Heat always flows from low temperature to high temperature.
In light of the above statements, choose the correct answer from the options given below: - With increase in pressure ratio in Brayton cycle the net work output
View More Questions
Top CUET PG Questions
- Given below are two statements:
Statement I: For Plato the meaning of the word 'Justice' is basically a conception in the mind only.
Statement II: For Plato the meaning of the word 'Justice' is fixed, mind-independently
In the light of the above statements, choose the correct answer from the options given below: - What is the electron count of OS6CO182-?
- XeF4 hydrolysis gives A + B, HF, and Oxygen. Find A and B
- What is more basic in pyrol and pyridine?
- Hydrolysis of Al2C3, Be2?
View More Questions