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- Question
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
- Correct Answer
- 900° to 1100°C
- 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
- 2. The value of cp/cv for air is
Options- A. 1
- B. 1.4
- C. 1.8
- D. 23 Discuss
- 3. Which of the following has the highest calorific value?
Options- A. Peat
- B. Lignite
- C. Bituminous coal
- D. Anthracite coal Discuss
- 4. The efficiency of Ericsson cycle is __________ Carnot cycle.
Options- A. greater than
- B. less than
- C. equal to Discuss
- 5. When a gas is heated at constant volume
Options- A. its temperature will increase
- B. its pressure will increase
- C. both temperature and pressure will increase
- D. neither temperature nor pressure will increase Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
Options- A. greater than
- B. less than
- C. equal to Discuss
- 10. 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
Thermodynamics problems
Search Results
Correct Answer: two constant volume
Correct Answer: 1.4
Correct Answer: Anthracite coal
Correct Answer: equal to
Correct Answer: both temperature and pressure will increase
Correct Answer: In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
Correct Answer: total energy of a system remains constant
Correct Answer: True
Correct Answer: less than
Correct Answer: all of the above
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