Thermodynamics problems
- 1. One molecule of oxygen is __________ times heavier than the hydrogen atom.
Options- A. 12
- B. 14
- C. 16
- D. 32 Discuss
Correct Answer: 32
- 2. To ensure complete and rapid combustion of a fuel, some quantity of air, in excess of the theoretical or minimum air is supplied.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 3. According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
Options- A. first kind
- B. second kind Discuss
Correct Answer: second kind
- 4. Kerosene is distilled at
Options- A. 65° to 220°C
- B. 220° to 345°C
- C. 345° to 470°C
- D. 470° to 550°C Discuss
Correct Answer: 220° to 345°C
- 5. High air-fuel ratio in gas turbines
Options- A. increases power output
- B. improves thermal efficiency
- C. reduces exhaust temperature
- D. do not damage turbine blades Discuss
Correct Answer: reduces exhaust temperature
- 6. If in the equation pvn = C, the value of n = ? , then the process is called
Options- A. constant volume process
- B. adiabatic process
- C. constant pressure process
- D. isothermal process Discuss
Correct Answer: constant volume process
- 7. The efficiency of the dual combustion cycle for the same compression ratio, is __________ Diesel cycle.
Options- A. greater than
- B. less than
- C. equal to Discuss
Correct Answer: greater than
- 8. The mass of flue gas per kg of fuel is the ratio of the
Options- A. mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
- B. mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
- C. mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
- D. mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas Discuss
Correct Answer: mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
- 9. A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
Options- A. same
- B. lower
- C. higher Discuss
Correct Answer: higher
- 10. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
Options- A. 0.086
- B. 1.086
- C. 3.086
- D. 4.086 Discuss
Correct Answer: 1.086
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