Thermodynamics problems
- 1. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as
Options- A. reversible cycle
- B. irreversible cycle
- C. thermodynamic cycle
- D. none of these Discuss
Correct Answer: thermodynamic cycle
- 2. Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Incorrect
- 3. The value of gas constant (R) in S. I. units is
Options- A. 0.287 J/kgK
- B. 2.87 J/kgK
- C. 28.7 J/kgK
- D. 287 J/kgK Discuss
Correct Answer: 287 J/kgK
- 4. Which of the following gas is mostly used in town for street and domestic lighting and heating?
Options- A. Producer gas
- B. Coal gas
- C. Mond gas
- D. Coke oven gas Discuss
Correct Answer: Coal gas
- 5. The absolute zero temperature is taken as
Options- A. -273°C
- B. 273°C
- C. 237°F
- D. -237°F Discuss
Correct Answer: -273°C
- 6. The specific heat of water is
Options- A. 1.817
- B. 2512
- C. 4.187
- D. none of these Discuss
Correct Answer: 4.187
- 7. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
Options- A. cracking
- B. carbonisation
- C. fractional distillation
- D. full distillation Discuss
Correct Answer: fractional distillation
- 8. Which of the following statement is incorrect?
Options- A. The liquid fuels consist of hydrocarbons.
- B. The liquid fuels have higher calorific value than solid fuels.
- C. The solid fuels have higher calorific value than liquid fuels.
- D. A good fuel should have low ignition point. Discuss
Correct Answer: The solid fuels have higher calorific value than liquid fuels.
- 9. Which of the following is correct?
Options- A. Absolute pressure = Gauge pressure + Atmospheric pressure
- B. Gauge pressure = Absolute pressure + Atmospheric pressure
- C. Atmospheric pressure = Absolute pressure + Gauge pressure
- D. Absolute pressure = Gauge pressure - Atmospheric pressure Discuss
Correct Answer: Absolute pressure = Gauge pressure + Atmospheric pressure
- 10. Workdone in a free expansion process is
Options- A. zero
- B. minimum
- C. maximum
- D. positive Discuss
Correct Answer: zero
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