Thermodynamics problems
- 1. A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.
Options- A. two constant pressure
- B. two constant volume
- C. two isentropic
- D. one constant pressure, one constant volume Discuss
Correct Answer: two constant volume
- 2. The hard coke is obtained when carbonisation of coal is carried out at
Options- A. 300° to 500°C
- B. 500° to700°C
- C. 700° to 900°C
- D. 900° to 1100°C Discuss
Correct Answer: 900° to 1100°C
- 3. Which of the following statement is wrong?
Options- A. The closed cycle gas turbine plants are external combustion plants.
- B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
- C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
- D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required. Discuss
Correct Answer: In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
- 4. According to First law of thermodynamics,
Options- A. total internal energy of a system during a process remains constant
- B. total energy of a system remains constant
- C. workdone by a system is equal to the heat transferred by the system
- D. internal energy, enthalpy and entropy during a process remains constant Discuss
Correct Answer: total energy of a system remains constant
- 5. In an isolated system, neither the heat and work nor the, mass of the working substance crosses the boundary of the system.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
Options- A. greater than
- B. less than
- C. equal to Discuss
Correct Answer: less than
- 7. The condition for the reversibility of a cycle is
Options- A. the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
- B. all the processes, taking place in the cycle of operation, must be extremely slow
- C. the working parts of the engine must be friction free
- D. all of the above Discuss
Correct Answer: all of the above
- 8. The numerical value of the thermal capacity and the water equivalent of the substance are the same.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 9. The compression ratio is the ratio of
Options- A. swept volume to total volume
- B. total volume to swept volume
- C. swept volume to clearance volume
- D. total volume to clearance volume Discuss
Correct Answer: total volume to clearance volume
- 10. The natural solid fuel is
Options- A. wood
- B. coke
- C. anthracite coal
- D. pulverised coal Discuss
Correct Answer: wood
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