MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A reversible engine is operating with temperature limits of 800 K and 300 K. If it takes 560 kJ of heat, then unavailable work should be: |
| A. | 210 kJ |
| B. | 200 kJ |
| C. | 175 kJ |
| D. | 150 kJ |
| Answer» B. 200 kJ | |
| 2. |
During a thermodynamic process, 100 kJ of heat is transfered from a reservoir at 800 K. to a sink at 400 K. The ambient temperature reservoir is 300 K. The loss of available energy is |
| A. | 27.5 kJ |
| B. | 32.5 kJ |
| C. | 37.5 kJ |
| D. | 62.5 kJ |
| Answer» D. 62.5 kJ | |
| 3. |
Consider the following processes:1. Extension of a spring2. Plastic deformation of a material3. Magnetization of a material exhibiting hysteresisWhich of the above processes are irreversible? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 4. |
A body of mass 2 kg and Cp = 1.00 kJ/kgK is available at 600 K if the atmosphere is 300 K and ln 2 = 0.693, the maximum work obtainable from the body till it comes to equilibrium with the atmosphere is |
| A. | 150 kJ |
| B. | 142 kJ |
| C. | 184 kJ |
| D. | 190.5 kJ |
| Answer» D. 190.5 kJ | |
| 5. |
A heat reservoir is maintained at 927°C. If the ambient temperature is 27°C, the availability of heat from the reservoir is limited to |
| A. | 57% |
| B. | 66% |
| C. | 70% |
| D. | 75% |
| E. | 88% |
| Answer» E. 88% | |
| 6. |
Gibbs phase rule defines the relationship between degrees of freedom (F) of a system, number of phases (P) and the number of components (c). What is the equation? |
| A. | F + P = C |
| B. | F + P = C + 1 |
| C. | F – P = C |
| D. | F + P = C + 2 |
| Answer» E. | |
| 7. |
1000 kJ/s of heat is transferred from a constant temperature heat reservoir maintained at 1000 K to a system at a constant temperature of 500 K. The temperature of the surroundings is 300 K. The net loss of available energy as a result of this heat transfer is: |
| A. | 450 kJ/s |
| B. | 400 kJ/s |
| C. | 350 kJ/s |
| D. | 300 kJ/s |
| Answer» E. | |
| 8. |
A vapour while condensing at 420°C transfers heat to water evaporating at 250°C. If ambient is at 35°C, what fraction of available energy is lost in the process? |
| A. | 0.18 |
| B. | 0.22 |
| C. | 0.26 |
| D. | 0.3 |
| Answer» D. 0.3 | |