MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For proper utilization of exergy, it is desirable to make first law efficiency ____ and the source and use temperatures should ____ |
| A. | as close to unity, be different |
| B. | as close to unity, match |
| C. | as close to zero, match |
| D. | as close to zero, be different |
| Answer» C. as close to zero, match | |
| 2. |
Both first law efficiency and second law efficiency indicate how effectively the input has been converted into the product. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 3. |
In case of a heat pump, second law efficiency is given asa) (first law efficiency)*(1-Ta/To)b) (first law efficiency)*(1+To/Ta)c) (first law efficiency)*(1-To/T |
| A. | (first law efficiency)*(1-Ta/To) |
| B. | (first law efficiency)*(1+To/Ta) |
| C. | (first law efficiency)*(1-To/Ta) |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 4. |
If solar energy Qr is available at a reservoir storage temperature of Tr and if quantity of heat Qa is transferred by the solar collector at temperature Ta, then which of the following is true?a) first law efficiency = Qa/Qrb) second law efficiency = exergy output / exergy inputc) second law efficiency = (first law efficiency)*(1-To/T |
| A. | first law efficiency = Qa/Qr |
| B. | second law efficiency = exergy output / exergy input |
| C. | second law efficiency = (first law efficiency)*(1-To/Ta)/(1-To/Tr) |
| D. | all of the mentioned |
| Answer» E. | |
| 5. |
If work is involved, Amin= ____ and if heat is involved, Amin= ____ |
| A. | w, Q(1+To/T) |
| B. | W, Q(1-To/T) |
| C. | Q(1+To/T), W |
| D. | Q(1-To/T), W |
| Answer» C. Q(1+To/T), W | |
| 6. |
Second law efficiency can also be given as |
| A. | 1 / ( first law efficiency * Carnot efficiency) |
| B. | Carnot efficiency * first law efficiency |
| C. | Carnot efficiency / first law efficiency |
| D. | first law efficiency / Carnot efficiency |
| Answer» E. | |
| 7. |
For a power plant, second law efficiency can be given by desired output(W) / available energy(Wmax). |
| A. | true |
| B. | false |
| Answer» B. false | |
| 8. |
Second law efficiency is defined as |
| A. | actual exergy intake / minimum exergy intake |
| B. | minimum exergy intake / actual exergy intake |
| C. | actual exergy intake / maximum exergy intake |
| D. | maximum exergy intake / minimum exergy intake |
| Answer» C. actual exergy intake / maximum exergy intake | |
| 9. |
With the concept of exergy available, which of the following is possible? |
| A. | to analyse means of minimizing the consumption of available energy to perform a given process |
| B. | to ensure most efficient possible conversion of energy |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 10. |
Which of the following statement is true about the first law? |
| A. | it is concerned only with the quantities of energy |
| B. | it disregards the form in which the energy exists |
| C. | it does not discriminate between the energies available at different temperatures |
| D. | all of the mentioned |
| Answer» E. | |
| 11. |
The first law efficiency is defined as the ratio of the output energy to the input energy. |
| A. | true |
| B. | false |
| Answer» B. false | |