Thermodynamics problems
- 1. When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called
Options- A. wood charcoal
- B. bituminous coal
- C. briquetted coal
- D. none of these Discuss
Correct Answer: none of these
- 2. A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called
Options- A. isothermal process
- B. hyperbolic process
- C. adiabatic process
- D. polytropic process Discuss
Correct Answer: hyperbolic process
- 3. The amount of heat generated per kg of fuel is known as
Options- A. calorific value
- B. heat energy
- C. lower calorific value
- D. higher calorific value Discuss
Correct Answer: calorific value
- 4. Wood charcoal is produced by heating the wood at 100°C.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 5. Which of the following is the correct statement?
Options- A. All the reversible engines have the same efficiency.
- B. All the reversible and irreversible engines have the same efficiency.
- C. Irreversible engines have maximum efficiency.
- D. All engines are designed as reversible in order to obtain maximum efficiency. Discuss
Correct Answer: Irreversible engines have maximum efficiency.
- 6. All perfect gases change in volume by 1 / 273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called
Options- A. Boyle's law
- B. Charles' law
- C. Gay-Lussac law
- D. Joule's law Discuss
Correct Answer: Charles' law
- 7. Coal gas consists mainly of hydrogen, carbon monoxide and various hydrocarbons.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 8. The process is adiabatic, if the value of n in the equation pvn = C, is
Options- A. 0
- B. 1
- C. ?
- D. ? Discuss
Correct Answer: ?
- 9. The throttling process is an irreversible steady flow expansion process.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 10. The calorific value of gaseous fuel is expressed in
Options- A. kJ
- B. kJ/kg
- C. kJ/m2
- D. kJ/m3 Discuss
Correct Answer: kJ/m3
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