Question 1
A closed thermodynamic system undergoes a process during which 50 kJ of heat is added to the system, and the system performs 30 kJ of work on its surroundings. According to the First Law of Thermodynamics, what is the change in the internal energy of the system?
Correct Answer:
20 kJ
Question 2
Air enters an insulated compressor operating at steady state at 100 kPa and 20°C (293 K) with negligible velocity, and exits at 1 MPa and 340°C (613 K) with a velocity of 80 m/s. The mass flow rate of air is 2 kg/s. Assuming air behaves as an ideal gas with Cp = 1.005 kJ/kg·K, calculate the power input required by the compressor.
Correct Answer:
649.6 kW
Question 3
A piston-cylinder device contains 0.1 kg of air initially at a pressure of 2 MPa and temperature of 350°C (623 K). The air undergoes a polytropic expansion to a final pressure of 0.2 MPa. If the polytropic index is n = 1.3, calculate the boundary work done by the gas during this process. (Take the gas constant R = 0.287 kJ/kg·K).
Correct Answer:
24.6 kJ
Question 4
A power plant heat engine operates between a high-temperature thermal reservoir at 600°C and a low-temperature sink reservoir at 25°C. What is the maximum theoretical thermal efficiency of this engine?
Correct Answer:
65.9%
Question 5
A Carnot refrigeration system operates in a room where the temperature is maintained at 27°C (300 K). If the refrigerator is required to maintain its cold space temperature at -13°C (260 K), calculate its Coefficient of Performance (COP).
Correct Answer:
6.5
Question 1
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Prepare with the IESL Part II Mechanical Practice Questions - IESL Qualifying Examination Part II - Mechanical Engineering Exam practice quiz. This question bank includes 100 questions covering calculate, water, pressure, beam, and length. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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IESL Part II Mechanical Practice Questions - IESL Qualifying Examination Part II - Mechanical Engineering Exam

This practice set contains 100 questions from the matching question bank and focuses on calculate, water, pressure, beam, and length. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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