**EIT/FE Exam Thermodynamics Questions**

1. An ideal gas experiences a constant pressure process at 206.8 kPa with an increase in volume of 566 Liters. What work is required to cause this volume change ?

- 91200 kJ
- 117 kJ
- 0.084 kJ
- 60 kJ
- 0.84 kJ

2. A 57 Liter volume of AIR is compressed from 1 atmosphere to 1.60 atm. in an isentropic process. What is the final volume of the air if it is further compressed to 208 kPa in an isentropic process ?

- 34 L
- 17 L
- 10.5 L
- 21 L
- 42 L

3. How much energy is required to heat 2.5 kg of water from 70 C to 95 C at 100 kPa pressure ?

- 105 kJ
- 31 kJ
- 211 kJ
- 262 kJ
- 78 kJ

4. A vapor and a liquid can coexist

- only at the triple point
- only above the critical pressure
- only below the triple point temperature
- only above the critical temperature
- below the critical temperature

5. What is the enthalpy of water at 165 C with quality of 97% ?

- 4766 kJ/kg
- 3761 kJ/kg
- 2701 kJ/kg
- 2066 kJ/kg
- 2004 kJ/kg

6. Air at 205 C and 345 kPa is compressed isothermally to one-tenth of its original volume. What is the final pressure ?

- 690 kPa
- 6900 kPa
- 2585 kPa
- 34.5 kPa
- 3450 kPa

7. Four kilograms of nitrogen gas is compressed in a reversible, adiabatic process from 101.325 kPa and 20 C to 506.625 kPa. The compression process follows a polytropic relationship with n=1.4. What work is done on the gas during the compression ?

- -885 kJ
- 508 kJ
- 776 kJ
- 885 kJ
- -508 kJ

8. What is the efficiency of an ideal Carnot heat engine cycle operating between 38 C and 482 C ?

- 90 %
- 89 %
- 59 %
- 16 %
- 11 %

9. A Carnot refrigeration cycle operates between -10 C and 23 C. What is its coefficient of performance ?

- 1.3
- 3.7
- 4.5
- 7.9
- 8.9

10. A steam turbine receives 550 kPa steam with an enthalpy of 2955 kJ/kg. The turbine exhausts to 175 kPa and the exhaust steam has an enthalpy of 2765 kJ/kg. What is the energy used by the turbine ?

- 13132 kJ/kg
- 190 kJ/kg
- 263 kJ/kg
- 12890 kJ/kg
- none of the above

11. Which of the following is an extensive property ?

- temperature
- weight
- composition
- pressure
- none of the above

12. A 0.71 m^{3} tank contains 4.5
kg of an ideal gas. The molecular weight of this gas is 44 kg/kmole and
the gas temperature is 21^{o}C. What is the gas pressure ?

- 352 kPa
- 25 kPa
- 190 kPa
- 15497 kPa
- 25 MPa

13. When the pressure of an ideal gas is doubled and the absolute temperature is halved, its volume is:

- constant
- doubled
- increased by 4 times
- cut in half
- one fourth of its original

14. 0.9 kg of hydrogen gas is cooled from
400^{o}C to 350^{o}C in an isometric process. How much
heat transfer occurs in this system ?

- 510 kJ
- -459 kJ
- -510 kJ
- 459 kJ
- none of the above

15. An ideal gas in a frictionless,
vertical piston-cylinder device is heated and expands from a volume of 0.04 m^{3}
to 0.10 m^{3} while the pressure remains constant at 200 kPa. What
work is done by the system ?

- 8 kJ
- 10 kJ
- 12 kJ
- 14 kJ
- none of the above

Answers: 1) B, 2) A, 3) D, 4) E, 5) C, 6) E, 7) E, 8) C, 9) D, 10) B, 11) B 12) A, 13) E, 14) B, 15) C