Thermodynamics problems
- 1. The mass of excess air supplied is equal to
Options- A.
x Mass of excess carbon - B. x Mass of excess oxygen
- C.
x Mass of excess carbon - D. x Mass of excess oxygen
Discuss
Correct Answer:
x Mass of excess oxygen - 2. A cycle consisting of two isothermal and two isentropic processes, is known as
Options- A. Carnot cycle
- B. Stirling cycle
- C. Ericsson cycle
- D. Joule cycle Discuss
Correct Answer: Carnot cycle
- 3. In an ideal gas turbine plant, it is assumed that the compression and expansion processes are
Options- A. isothermal
- B. isentropic
- C. polytropic
- D. none of these Discuss
Correct Answer: isentropic
- 4. When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is
Options- A. coke
- B. wood charcoal
- C. bituminous coal
- D. briquetted coal Discuss
Correct Answer: wood charcoal
- 5. The change of entropy, when heat is removed from the gas, is positive.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 6. Steam coal is a
Options- A. pulverised coal
- B. brown coal
- C. coking bituminous coal
- D. non-coking bituminous coal Discuss
Correct Answer: non-coking bituminous coal
- 7. Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as
Options- A. Zeroth law of thermodynamics
- B. First law of thermodynamics
- C. Second law of thermodynamics
- D. Kinetic theory of gases Discuss
Correct Answer: First law of thermodynamics
- 8. The atomic mass of an element is the number of times the atom of that element is heavier than the hydrogen atom.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)
Options- A. Ru x T
- B. 1.5 Ru x T
- C. 2 Ru x T
- D. 3 Ru x T Discuss
Correct Answer: 1.5 Ru x T
- 10. The efficiency of Diesel cycle increases with increase in cut-off.
Options- A. Yes
- B. No Discuss
Correct Answer: No
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