Work in a Reversible Process-3 MCQ

Test your knowledge with important Work in a Reversible Process-3 MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Work in a Reversible Process-3 MCQs at Bissoy

• A Korean refrigerator is bought to maintain the cool space at 8°C and a Japanese refrigerator is bought to main the cool space at -20°C in a laboratory room having constant temperature of 25°C. If the both refrigerators run on a reversed Carnot cycle, state the refrigerator that delivers maximum COP.
  ক

  Korean refrigerator

  খ

  Japanese refrigerator

  গ

  both have same COP

  ঘ

  none of the mentioned
• During the winter season, a room is heated by central heating furnace which delivers the 750 W of heat energy by burning wood pellets. How much power can be saved if heat pump with a COP of 3 is used instead of furnace?
  ক

  100 W

  খ

  500 W

  গ

  1000 W

  ঘ

  1500 W
• A Carnot heat engine receives heat at 750 K and rejects the waste heat to the environment at 300 K. The net work output of the heat engine is used to drive a Carnot refrigerator, whose COP is 6.14. If the heat removal rate from the refrigerated space is 6.6 kW, determine the rate of heat supply to the heat engine?
  ক

  2.79 kW

  খ

  1.79 kW

  গ

  4.79 kW

  ঘ

  7.79 kW
• A piston cylinder contains 1 kg of liquid water at 20°C and 300 kPa. There is a linear spring mounted on the piston such that when the water is heated the pressure reaches 3 MPa with a volume of 0.1m^3. Find the work in the process.
  ক

  163.35 kJ

  খ

  263.35 kJ

  গ

  363.35 kJ

  ঘ

  463.35 kJ
• A piston cylinder contains 1 kg of liquid water at 20°C and 300 kPa. There is a linear spring mounted on the piston such that when the water is heated the pressure reaches 3 MPa with a volume of 0.1m^3. Find the final temperature.
  ক

  400°C

  খ

  404°C

  গ

  408°C

  ঘ

  none of the mentioned
• The refrigerant R-22 is contained in a piston/cylinder where the volume is 11 L when the piston hits the stops. The initial state is −30°C, 150 kPa with a volume of 10 L. This system is brought indoors and warms up to 15°C. Find the work done by the R-22 during this process.
  ক

  -0.15 kJ

  খ

  0.15 kJ

  গ

  -0.35 kJ

  ঘ

  0.35 kJ
• A steam turbine receives steam at 6 MPa, 800°C. It has a heat loss of 49.7 kJ/kg and an isentropic efficiency of 90%. For an exit pressure of 15 kPa and surroundings at 20°C, find the actual work.
  ক

  2233.79 kJ/kg

  খ

  2423.95 kJ/kg

  গ

  2483.95 kJ/kg

  ঘ

  1648.79 kJ/kg
• Find the specific reversible work for a R-134a compressor with inlet state of –20°C, 100 kPa and an exit state of 600 kPa, 50°C. Use a 25°C ambient temperature.
  ক

  -18.878 kJ/kg

  খ

  -28.878 kJ/kg

  গ

  -38.878 kJ/kg

  ঘ

  -48.878 kJ/kg
• A steam turbine inlet is at 1200 kPa, 500°C. The actual exit is at 300 kPa, 300°C with an actual work of 407 kJ/kg. What is its reversible work output if ambient temperature is at 25°C?
  ক

  414.9 kJ/kg

  খ

  314.9 kJ/kg

  গ

  214.9 kJ/kg

  ঘ

  614.9 kJ/kg
• A piston cylinder contains 3 kg of air at 20°C and 300 kPa. It is now heated up in a constant pressure process to 600 K. Find the heat transfer.
  ক

  641 kJ

  খ

  741 kJ

  গ

  841 kJ

  ঘ

  941 kJ
• A 250 L rigid tank contains methane at 500 K, 1500 kPa. It is now cooled down to 300 K. Find the heat transfer using ideal gas.
  ক

  –402.4 kJ

  খ

  –502.4 kJ

  গ

  –602.4 kJ

  ঘ

  –702.4 kJ
• Air (an ideal gas) at 227°C and 500 kPa is allowed to expand to a pressure of 100 kPa in an ideal throttling process. What will be the final temperature of the expanded air?
  ক

  230°C

  খ

  227°C

  গ

  300°C

  ঘ

  327°C
• 19 mm thick fibre panels with thermal conductivity of 0.12 W/m.K are used for false ceiling of an AC room. If the floor area of the room is 17.65 m^2 and the temperature difference across the fibre panel is 15°C, calculate the heat transfer rate.
  ক

  4.672 kW

  খ

  3.672 kW

  গ

  2.672 kW

  ঘ

  1.672 kW
• The force needed to compress a non-linear spring is given by F = 200x + 30x^2, where F is force in Newton and x is displacement of the spring in meter. Determine the work needed to compress the spring a distance of 0.6 m.
  ক

  32.46 J

  খ

  23.43 J

  গ

  38.16 J

  ঘ

  48.87 J