Tiêu đề Thermo Final _40293681_2025_02_19_22_57.pdf ✅

90 To download app click: https://rb.gy/fpdjan BASICS AND ZEROTH LAW OF THERMODYNAMICS 4. The above cycle is represented on T-s plane by A. B. C. D. [2007 : 2 Marks] 5. If the specific heats of the working fluid are constant and the value of specific heat ratio  is 1.4, the thermal efficiency (%) of the cycle is A. 21 B. 40.9 C. 42.6 D. 59.7 [2007 : 2 Marks] 6. A gas expands in a frictionless piston-cylinder arrangement. The expansion process is very slow and is resisted by an ambient pressure of 100 kPa. During the expansion process, the pressure of the system (gas) remains constant at 300 kPa. The change in volume of the gas is 0.01 m3. The maximum amount of work that could be utilized from the above process is A. 0 kJ B. 1 kJ C. 2 kJ D. 3 kJ [2008 : 2 Marks] 7. A frictionless piston-cylinder device contains a gas initially at 0.8 MPa and 0.015 m3. It expands quasi statically at constant temperature to a final volume of 0.030 m3. The work output (in kJ) during this process will be A. 8.32 B. 12.00 C. 554.67 D. 8320.00 [2009 : 1 Mark] 8. Heat and work are A. intensive properties B. extensive properties C. point functions D. path functions [2011 : 1 Mark] 9. A certain amount of an ideal gas is initially at a pressure p1 and temperature T1 First, it undergoes a constant pressure process 1-2 such that 1 2 3T T 4  . Then, it undergoes a constant volume process 2-3 such that 1 3 T T 2  . The ratio of the final volume to the initial volume of the ideal gas is A. 0.25 B. 0.75 C. 1.0 D. 1.5 [2014 : 2 Marks, Set-3] 10. Temperature of nitrogen in a vessel of volume 2 m3 is 288 K. A U-tube manometer connected by the vessel shows a reading of 70 cm of mercury (level higher in the end open to atmosphere). The universal gas constant is 8314 J/kmol-K, atmospheric pressure is 1.01325 bar, acceleration due to gravity is 9.81 m/s2 and density of mercury is 13600 kg/m3. The mass of nitrogen (in kg) in the vessel is _____ (Correct upto two decimal place). [2015 : 2 Marks, Set-1]