## Mark 12 summary

- An air-standard dual cycle has a compression ratio of 14 and a cutoff ratio of $1.2 .$ The pressure ratio during the constant-volume heat addition process is $1.5 .$ Determine the thermal efficiency, amount of heat added, the maximum gas pressure and temperature when this cycle is operated at $80 \mathrm{kPa}$ and $20^{\circ} \mathrm{C}$ at the ...
- Heat loss at a constant rate of 25 kw takes place from the nozzle to the surroundings. Assume air to behave as idealgas with the constant pressure specific heat values of 1.005 kJ/kg and neglect potential energy change, the exit velocity of air is _____ m/s.Correct answer is '504'.
- An air-standard cycle with constant specific heats is executed in a closed piston-cylinder system and is composed of the following three processes: 1.2 Isentropic compression with a compression ratior =6,T1, = 27°C, andP1, = 100 kPa 2-3 Constant pressure heat addition 3-1 Constant volume heat rejection Assume air has constant properties withcv = 0.718 kJ/kg•K,cp= 1.005 kJ/kg•K,R= 0.287 kJ ...
- For dry air, the specific heat at constant pressure may be taken as 1.005 kJ/kg-K and the specific heat at constant volume as 0.718 kJ/kg-K; In general the value of γ for dry air is of the order 1.4.
- 1 005 kJ; 2 pages. Quiz 3 Review Question.pdf ... c = specific heat (constant pressure) = thermal efficiency mep = mean effective pressure Air-Standard Assumptions 1 ...
- efficiency is 0.78. Assume specific heat of air at constant pressure as 1.005 kJ/kgK, specific heat ratio for air as 1.4, specific heat of gas at constant pressure is 1.147 kJ/kgK and specific heat ratio for gas is 1.33. Find the following: The turbine work output(kJ/kg) for cycle is a) 367 b) 332 c) 353 d) 323 No, the answer is incorrect. Score: 0
- The gas constant of air is 0.287 kPa-m3/kg-K. The constant pressure specific heat of air is cP= 1.005 kJ/kg·°C. The; Question: Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 30°C in a condenser by air. The air enters at 100 kPa and 27°C with a volume flow rate of 540 m3/min and leaves at 95 kPa and 60°C.
- Jan 23, 2021 · The constant pressure specific heat of air at room temperature is cp = 1.005 kJ/kg.K (Table A-2). The properties of R-134a at the inlet and the exit states are (Tables A-11 through A-13) Analysis Air at specified conditions can be treated as an ideal gas with specific heats at room temperature.
- 3. Define [1] Specific heat at constant volume [2] Specific heat constant pressure 4. Derive Cp – Cv = R with usual notations. 5. Ideal gas specific heats of CO 2 0at constant pressure & at constant volume are 0.846 kJ/kg K & 0.657 kJ/kg0K. Find its gas characteristic constant R & ratio of specific heats. CONTINUOUS ASSESSMENT SCHME Meets Sr ...