Polytropic Process-2 MCQ

Test your knowledge with important Polytropic Process-2 MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Polytropic Process-2 MCQs at Bissoy

• A piston/cylinder contains carbon dioxide at 300 kPa, 100°C with a volume of 0.2 m^3. Weights are added at such a rate that the gas compresses according to the relation PV^1.2 = constant to a final temperature of 200°C. Determine the work done during the process.
  ক

  70.4 kJ

  খ

  -70.4 kJ

  গ

  80.4 kJ

  ঘ

  -80.4 kJ
• A piston-cylinder contains water at 3 MPa, 500°C. It is cooled in a polytropic process to 1 MPa, 200°C. Find the specific work in the process.
  ক

  155.2 kJ

  খ

  165.2 kJ

  গ

  175.2 kJ

  ঘ

  185.2 kJ
• R-12 in a piston-cylinder arrangement is initially at 50°C, x = 1. It is then expanded in a process so that P = Cv^(−1) to a pressure of 100 kPa. Find the work.
  ক

  23.2 kJ/kg

  খ

  33.2 kJ/kg

  গ

  43.2 kJ/kg

  ঘ

  53.2 kJ/kg
• Consider a piston-cylinder with 0.5 kg of R-134a as saturated vapour at -10°C. It is compressed to a pressure of 500 kPa in a polytropic process with n = 1.5. Determine the work done during the process.
  ক

  -6.07 kJ

  খ

  -7.07 kJ

  গ

  -8.07 kJ

  ঘ

  -9.07 kJ
• A balloon behaves such that pressure inside it is proportional to the diameter squared. It contains 2kg of ammonia at 0°C, 60% quality. They are now heated so that the final pressure is 600 kPa. Find the work done in the process.
  ক

  117.5 kJ

  খ

  127.5 kJ

  গ

  137.5 kJ

  ঘ

  147.5 kJ
• A balloon behaves according to the equation P = (C2)V^(1/3), C2 = 100 kPa/m. The balloon is blown up with air from a volume of 1 m^3 to a volume of 3 m^3. Find the work done by the air assuming it is at 25°C.
  ক

  219.5 kJ

  খ

  229.5 kJ

  গ

  239.5 kJ

  ঘ

  249.5 kJ
• A piston-cylinder contains 0.1 kg air at 400 K, 100 kPa which goes through a polytropic compression process (n = 1.3) to a pressure of 300 kPa. How much work has been done by air in the process?
  ক

  -277 kJ

  খ

  -377 kJ

  গ

  -477 kJ

  ঘ

  -577 kJ
• Air goes through a polytropic process from 325 K, 125 kPa to 500 K, 300 kPa. Find the specific work in the process.
  ক

  -51.8 kJ/kg

  খ

  -61.8 kJ/kg

  গ

  -71.8 kJ/kg

  ঘ

  -81.8 kJ/kg
• Helium gas expands from 350 K, 125 kPa and 0.25 m^3 to 100 kPa in a polytropic process with n = 1.667. How much work does it give out?
  ক

  3.09 kJ

  খ

  4.09 kJ

  গ

  5.09 kJ

  ঘ

  6.09 kJ
• A gas initially at 500°C, 1 MPa is contained in a piston-cylinder arrangement with an initial volume of 0.1 m^3. It is then slowly expanded according to the relation PV = constant until a final pressure of 100 kPa is attained. Determine the work for this process.
  ক

  200.3 kJ

  খ

  210.3 kJ

  গ

  220.3 kJ

  ঘ

  230.3 kJ
• A piston-cylinder contains carbon dioxide at 2MPa with V=50 L. The device has a mass of 4 kg. Everything is initially at 200°C. By heat transfer the whole system cools to 25°C, at which point the gas pressure is 1.5 MPa. Find the work done.
  ক

  -10.0 kJ

  খ

  -12.0 kJ

  গ

  -14.0 kJ

  ঘ

  -16.0 kJ
• A cylinder/piston contains air at 100 kPa and 20°C with a V=0.3 m^3. The air is compressed to 800 kPa in a reversible polytropic process with n = 1.2, after which it is expanded back to 100 kPa in a reversible adiabatic process. Find the net work.
  ক

  -174.6 kJ/kg

  খ

  -154.6 kJ/kg

  গ

  -124.6 kJ/kg

  ঘ

  -194.6 kJ/kg