Thermodynamics problems
- 1. An open cycle gas turbine works on
Options- A. Carnot cycle
- B. Otto cycle
- C. Joule's cycle
- D. Stirling cycle Discuss
Correct Answer: Joule's cycle
- 2. Stirling cycle consists of
Options- A. two constant volume and two isentropic processes
- B. two constant volume and two isothermal processes
- C. two constant pressure and two isothermal processes
- D. one constant volume, one constant pressure and two isentropic processes Discuss
Correct Answer: two constant volume and two isothermal processes
- 3. According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
Options- A. remains constant
- B. increases
- C. decreases Discuss
Correct Answer: increases
- 4. When a fluid is allowed to expand suddenly into a vaccum chamber through an orifice of large dimensions, the process is known as free expansion process.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. The efficiency of Carnot cycle depends upon
Options- A. temperature limits
- B. pressure ratio
- C. volume compression ratio
- D. cut-off ratio and compression ratio Discuss
Correct Answer: temperature limits
- 6. The amount of heat required to raise the temperature of unit mass of a gas through one degree at constant pressure is called specific heat at constant pressure.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. The entropy is a point function and thus it is a property of the same.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 8. The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)
Options- A. ?Q = T.ds
- B. ?Q = T/ds
- C. dQ = ds/T
- D. none of these Discuss
Correct Answer: ?Q = T.ds
- 9. In open cycle gas turbine plants
Options- A. the indirect heat exchanger and cooler is avoided
- B. direct combustion system is used
- C. a condenser is used
- D. all of the above Discuss
Correct Answer: all of the above
- 10. The value of universal gas constant is same for all gases.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
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