04-BS-10
Worked solutions to 14 past sittings (2013–2019), 126 questions. Pick a sitting, or start from a topic below.
- December 2019
- December 2018
- May 2018
- December 2017
- May 2017
- December 2016
- May 2016
- December 2015
- May 2015
- December 2014
- May 2014
- December 2013
- May 2013
- Undated paper
Topics across the sittings
Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.
- Variable Specific Heats (9 sittings): May 2018 Q6 · December 2017 Q5 · December 2016 Q3 · May 2016 Q4 · May 2015 Q8 · December 2014 Q2 · May 2014 Q4 · December 2013 Q4 · May 2013 Q2
- Closed + Open Feedwater Heaters (4 sittings): December 2018 Q1 · December 2016 Q1 · May 2014 Q1 · December 2013 Q2
- Constant-Pressure Heating (4 sittings): May 2018 Q9 · December 2017 Q7 · December 2014 Q5 · May 2014 Q5
- Regenerative Brayton Cycle (4 sittings): May 2015 Q3 · December 2013 Q3 · May 2013 Q2 · Undated paper Q2
- Regenerative Rankine Cycle (4 sittings): December 2019 Q1 · December 2018 Q1 · May 2018 Q2 · December 2016 Q1
- Air Turbine (3 sittings): December 2018 Q8 · May 2018 Q4 · May 2015 Q5
- Air-Standard Diesel Cycle (3 sittings): May 2018 Q6 · December 2016 Q6 · December 2013 Q4
- Regenerative Gas Turbine (3 sittings): December 2017 Q2 · May 2016 Q2 · December 2015 Q2
- Reversibility Check (3 sittings): May 2018 Q4 · December 2016 Q4 · May 2015 Q5
- Two-Stage Intercooled Compressor (3 sittings): December 2017 Q2 · May 2016 Q2 · December 2015 Q2
- Adiabatic Mixing Chamber (2 sittings): December 2017 Q8 · December 2014 Q7
- Brayton Cycle with Reheat (2 sittings): December 2019 Q2 · December 2016 Q3
- Carnot Power Cycle (2 sittings): December 2018 Q9 · December 2016 Q9
- Constant Specific Heats (2 sittings): May 2018 Q7 · December 2013 Q3
- Exergy Destruction by Process (2 sittings): May 2015 Q3 · Undated paper Q1
Questions by sitting
December 2019
- Question 1: Regenerative Rankine Cycle, One Closed Feedwater Heater
- Question 2: Brayton Cycle with Reheat
- Question 3: Two-Evaporator R-134a Refrigeration System
- Question 4: Ideal-Gas Refrigeration Cycle
- Question 5: Isentropic Compression of an N₂/CO₂ Gas Mixture
- Question 6: Air Dehumidifier
- Question 7: Non-Ideal Air-Standard Diesel Cycle
- Question 8: Non-Adiabatic Steam–Air Heat Exchanger
- Question 9: Heat Pump — Minimum Cost of Operation
December 2018
- Question 1: Regenerative Rankine Cycle, Closed + Open Feedwater Heaters
- Question 2: Cold-Air-Standard Regenerative Brayton Cycle
- Question 3: Two-Evaporator R-134a Refrigeration System
- Question 4: N₂/O₂ Mixture — Adiabatic Compression
- Question 5: Adiabatic Compression of Moist Air
- Question 6: Rigid Insulated Tank with Paddle Wheel
- Question 7: Two-Phase Water Expansion, Pv = Constant
- Question 8: Air Turbine — Power and Exit Area
- Question 9: Carnot Power Cycle — Air Standard
May 2018
- Question 1: Reheat Rankine Cycle with Second-Law Efficiency
- Question 2: Regenerative Rankine Cycle, One Open Feedwater Heater
- Question 3: Two-Stage Compression Refrigeration with Flash Chamber
- Question 4: Air Turbine — Reversibility Check
- Question 5: Rigid Tank Charged from a Steam Supply Line
- Question 6: Air-Standard Diesel Cycle, Variable Specific Heats
- Question 7: Simple Brayton Cycle, Constant Specific Heats
- Question 8: Sensible Heating of Humid Air
- Question 9: H₂/N₂ Mixture, Constant-Pressure Heating
December 2017
- Question 1: Reheat Rankine Cycle with Second-Law Efficiency
- Question 2: Regenerative Gas Turbine, Two-Stage Intercooled Compressor
- Question 3: Two-Stage Compression Refrigeration with Flash Chamber (R-134a)
- Question 4: N₂/CO₂ Ideal-Gas Mixture, Isentropic Compression
- Question 5: Adiabatic Nozzle, Variable Specific Heats
- Question 6: Rigid Insulated Tank with Paddle-Wheel Work Input
- Question 7: Piston-Cylinder H₂/N₂ Mixture, Constant-Pressure Heating
- Question 8: Adiabatic Mixing Chamber
- Question 9: Rigid Tank Vaporization by Electric-Resistance Heating
May 2017
- Question 1: Ideal Reheat Rankine Cycle with Full Exergy Breakdown
- Question 2: Two-Stage Intercooled/Reheated Regenerative Brayton Cycle
- Question 3: Two-Stage Compression Refrigeration with Flash Chamber (R-134a)
- Question 4: Exhaust-Gas Heat Recovery Steam Generator (HRSG)
- Question 5: Air-Standard Diesel Cycle from Given End-State Pressure/Temperature
- Question 6: Ideal Reverse-Brayton (Gas) Refrigeration Cycle
- Question 7: Rigid Insulated Tank with Paddle-Wheel Work Input
- Question 8: Adiabatic Compression of a Mass-Basis N₂/CO₂/O₂ Mixture
- Question 9: Adiabatic Dehumidification of Moist Air
December 2016
- Question 1: Regenerative Rankine Cycle, Closed + Open Feedwater Heaters
- Question 2: R-134a Heat Pump Driven by a Power Cycle
- Question 3: Brayton Cycle with Reheat, Variable Specific Heats
- Question 4: Steady-Flow Air Turbine, Reversibility Check
- Question 5: Rigid Tank Charged from a Steam Supply Line
- Question 6: Air-Standard Diesel Cycle, Variable Specific Heats
- Question 7: Isentropic Compression of an N₂/CO₂ Mixture
- Question 8: Air Turbine with Significant Exit Kinetic Energy
- Question 9: Carnot Power Cycle, Air
May 2016
- Question 1: Reheat Rankine Cycle
- Question 2: Regenerative Gas Turbine, Two-Stage Intercooled Compressor
- Question 3: Two-Stage Compression Refrigeration with a Flash Chamber
- Question 4: Ideal Otto Cycle, Variable Specific Heats
- Question 5: Isentropic Compression of an N₂/CO₂ Ideal-Gas Mixture
- Question 6: Moist Air Heated at Constant Volume in a Sealed Rigid Vessel
- Question 7: Adiabatic Steam Turbine, Efficiency from a Measured Work Output
- Question 8: Two-Phase Expansion with Pv = Constant
- Question 9: Uncontrolled Expansion into an Evacuated Compartment
December 2015
- Question 1: Rankine Cycle with Non-Isentropic Turbine and Pump
- Question 2: Regenerative Gas Turbine, Two-Stage Intercooled Compressor
- Question 3: Gas Refrigeration Cycle (Reverse Brayton)
- Question 4: Isentropic Compression of an N₂/CO₂ Mixture
- Question 5: Psychrometrics from Dry-Bulb and Wet-Bulb Temperatures
- Question 6: Rigid Vessel of Saturated Water Vapor, Cooled at Constant Volume
- Question 7: Adiabatic Nozzle with Isentropic Efficiency
- Question 8: Carnot Power Cycle with Air
- Question 9: Rigid Tank Filled from a Supply Line, Isothermal
May 2015
- Question 1: Regenerative Rankine Cycle with One Closed Feedwater Heater
- Question 2: R-134a Heat Pump Driven by a Power Cycle
- Question 3: Regenerative Brayton Cycle — Exergy Destruction by Process
- Question 4: Isothermal Compression of Wet Steam in a Piston-Cylinder
- Question 5: Air Turbine — Power, Reversibility Check, Isentropic Efficiency
- Question 6: Water/Hot-Air Heat Exchanger
- Question 7: Isentropic Compression of an N 2 /CO 2 Ideal-Gas Mixture
- Question 8: Air-Standard Otto Cycle — Variable Specific Heats
- Question 9: Rigid Tank Charged from a Steam Supply Line
December 2014
- Question 1: Reheat Rankine Cycle — Non-Ideal Turbines and Pump, with Second-Law Efficiency
- Question 2: Air-Standard Brayton Cycle — Two-Stage Turbine with Reheat, Variable Specific Heats
- Question 3: R-134a Heat Pump Driven by a Power Cycle
- Question 4: Air Conditioner — Cooling and Dehumidification of Moist Air
- Question 5: O₂/N₂ Ideal-Gas Mixture — Constant-Pressure Heating
- Question 6: R-134a — Entropy Change and Feasibility of an Adiabatic Process
- Question 7: Adiabatic Mixing Chamber — Hot and Cold Water Streams
- Question 8: Ideal Otto Cycle — Variable Specific Heats
- Question 9: R-134a Refrigerator — Non-Ideal Compressor with a Suction-Line Pressure Drop
May 2014
- Question 1: Ideal Regenerative Rankine Cycle — Closed + Open Feedwater Heaters, with Second-Law Efficiency
- Question 2: Ideal Regenerative Gas-Turbine Cycle — Two-Stage Intercooled Compression, Two-Stage Reheated Expansion
- Question 3: Two-Stage Compression Refrigeration with Flash Chamber (R-134a) — Evaporator Flow from Given Condenser Flow
- Question 4: Air-Standard Dual Cycle, Variable Specific Heats
- Question 5: Fixed-Composition O₂/N₂ Ideal-Gas Mixture, Constant-Pressure Heating
- Question 6: Moist Air in a Closed Rigid Vessel — Heating at Constant Humidity Ratio & Volume
- Question 7: Insulated Steam Turbine — Isentropic Efficiency from Given Actual Work
- Question 8: Two-Phase H₂O, Polytropic ($Pv=\text{const}$) Expansion
- Question 9: Insulated Vessel with Evacuated Compartment — Free Expansion of Steam
December 2013
- Question 1: Two-Stage Compression Refrigeration with Flash Chamber & Direct-Contact Heat Exchanger (R-134a)
- Question 2: Ideal Regenerative Rankine Cycle — Closed + Open Feedwater Heaters
- Question 3: Regenerative Brayton Cycle — Constant Specific Heats
- Question 4: Air-Standard Diesel Cycle — Variable Specific Heats
- Question 5: Isentropic Compression of an N₂/CO₂ Ideal-Gas Mixture
- Question 6: Rigid Insulated Tank — Paddle-Wheel Work and Irreversibility
- Question 7: Adiabatic Mixing of Two Moist-Air Streams
- Question 8: Rigid Tank Venting Saturated Vapor at Constant Temperature
- Question 9: Carnot Heat Pump — House Heating
May 2013
- Question 1: Two-Stage Compression Refrigeration with Flash Chamber (R-134a)
- Question 2: Regenerative Brayton Cycle — Variable Specific Heats and Exergy
- Question 3: Ideal Reheat Rankine Cycle — Turbine Work and Exergy Destruction
- Question 4: Air-Standard Dual Cycle with Non-Ideal Compression/Expansion
- Question 5: R-134a Heat Pump — Power Input and Comparison with Resistance Heating
- Question 6: Isentropic Compression of an N₂/CO₂ Ideal-Gas Mixture
- Question 7: Charging a Rigid Tank from a Supply Line (R-134a)
- Question 8: Entropy Change of an Ideal Gas Stirred at Constant Temperature
- Question 9: Isentropic Efficiency of an Air Turbine
Undated paper
- Question 1: Ideal Reheat Rankine Cycle, Exergy Destruction by Process
- Question 2: Regenerative Brayton Cycle, Exergy Destruction by Process
- Question 3: Two-Stage R-134a Compression Refrigeration with Flash Chamber
- Question 4: Ideal Air-Standard Dual Cycle
- Question 5: Ideal Brayton Refrigeration (Gas Refrigeration) Cycle
- Question 6: R-134a Refrigerator, Subcooled Condenser Exit
- Question 7: Rigid Insulated Tank, Paddle-Wheel Stirring
- Question 8: Rigid Tank, N₂/O₂ Ideal-Gas Mixture
- Question 9: Window Air Conditioner — Psychrometric Dehumidification