MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Thermal Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When system undergoes a process such that dQ/T = 0 and S>0, the process is ______ |
| A. | Irreversible adiabatic |
| B. | Reversible adiabatic |
| C. | Isothermal |
| D. | Isobaric |
| Answer» B. Reversible adiabatic | |
| 2. |
Which of the following statements applicable to a perfect gas will also be true for an irreversible process? |
| A. | dQ = dU + pdV |
| B. | dQ = du pdV |
| C. | Tds = dU + pdV |
| D. | Tds = du pdV |
| Answer» D. Tds = du pdV | |
| 3. |
Availability is also known as __________ |
| A. | Exergy |
| B. | Ronthalpy |
| C. | Enthalpy |
| D. | Entropy |
| Answer» B. Ronthalpy | |
| 4. |
The difference between idealized reversible work and actual work done by the system is called _____ |
| A. | Reversibility |
| B. | Irreversibility |
| C. | Gain in available energy |
| D. | Decrease in unavailable energy |
| Answer» C. Gain in available energy | |
| 5. |
The _________ has to be rejected by any cyclic heat engine is called _________ |
| A. | Maximum energy, unavailable energy |
| B. | Maximum energy, available energy |
| C. | Minimum energy, available energy |
| D. | Minimum energy, unavailable energy |
| Answer» E. | |
| 6. |
What is the part of heat energy which cannot be converted into mechanical work which reduce system in state of equilibrium? |
| A. | Available energy |
| B. | Electrical energy |
| C. | Unavailable energy |
| D. | Hydraulic energy |
| Answer» D. Hydraulic energy | |
| 7. |
The _________ obtainable from a certain heat input in a cyclic heat engine is called _________ |
| A. | Maximum work, unavailable energy |
| B. | Maximum work, available energy |
| C. | Minimum work, available energy |
| D. | Minimum work, unavailable energy |
| Answer» C. Minimum work, available energy | |
| 8. |
What is the part of heat energy which is converted into mechanical work which reduce system in state of equilibrium? |
| A. | Available energy |
| B. | Electrical energy |
| C. | Unavailable energy |
| D. | Hydraulic energy |
| Answer» B. Electrical energy | |
| 9. |
Gibbs function is given by _____ |
| A. | G = H TS |
| B. | G = pV TS |
| C. | G = U pV |
| D. | G = U + pV |
| Answer» B. G = pV TS | |
| 10. |
What is the lowest temperature at which heat rejection can takes place? |
| A. | 100 C |
| B. | 0K |
| C. | 273K |
| D. | Temperature equal to surrounding |
| Answer» E. | |
| 11. |
Availability function ( ) is given by ______ |
| A. | U-p<sub>0</sub>V-T<sub>0</sub>S |
| B. | U+p<sub>0</sub>V-T<sub>0</sub>S |
| C. | U+p<sub>0</sub>V-T<sub>0</sub>S |
| D. | p<sub>0</sub>V-T<sub>0</sub>S |
| Answer» C. U+p<sub>0</sub>V-T<sub>0</sub>S | |