MCQOPTIONS
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MCQOPTIONS
This section includes 16 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 heat engine receives 6 kW from a source at 250°C and rejects heat at 30°C with W. = 0 kW. Does this satisfy the inequality of Clausius? |
| A. | yes |
| B. | no |
| C. | cannot be said |
| D. | none of the mentioned |
| Answer» C. cannot be said | |
| 2. |
If dQ is the heat supplied at T and dQ2 is the heat rejected at T2, then efficiency is given by |
| A. | 1-(dQ2/dQ) |
| B. | 1-(dQ/dQ2) |
| C. | (dQ/dQ2)-1 |
| D. | (dQ2/dQ)-1 |
| Answer» B. 1-(dQ/dQ2) | |
| 3. |
If the cyclic integral of dQ/T is greater than zero then the cycle is |
| A. | irreversible but not possible |
| B. | irreversible but possible |
| C. | impossible |
| D. | reversible |
| Answer» D. reversible | |
| 4. |
If the cyclic integral of dQ/T is less than zero then the cycle is |
| A. | irreversible but not possible |
| B. | irreversible and possible |
| C. | impossible |
| D. | reversible |
| Answer» C. impossible | |
| 5. |
According to the Clausius’ theorem, the cyclic integral of ____ for a reversible cycle is zero. |
| A. | dW/dT |
| B. | dH/dT |
| C. | dQ/dT |
| D. | dE/dT |
| Answer» D. dE/dT | |
| 6. |
IF_DQ_IS_THE_HEAT_SUPPLIED_AT_T_AND_DQ2_IS_THE_HEAT_REJECTED_AT_T2,_THEN_EFFICIENCY_IS_GIVEN_BY?$ |
| A. | 1-(dQ2/dQ) |
| B. | 1-(dQ/dQ2) |
| C. | (dQ/dQ2)-1 |
| D. | (dQ2/dQ)-1 |
| Answer» B. 1-(dQ/dQ2) | |
| 7. |
IF_THE_CYCLIC_INTEGRAL_OF_DQ/T_IS_GREATER_THAN_ZERO_THEN_THE_CYCLE_IS?$ |
| A. | irreversible but not possible |
| B. | irreversible but possible |
| C. | impossible |
| D. | reversible |
| Answer» D. reversible | |
| 8. |
A heat engine receives 6 kW from a source at 250°C and rejects heat at 30°C with W. = 0 kW. Does this satisfy the inequality of Clausius?$# |
| A. | yes |
| B. | no |
| C. | cannot be said |
| D. | none of the mentioned |
| Answer» B. no | |
| 9. |
If the cyclic integral of dQ/T is less than zero then the cycle i? |
| A. | irreversible but not possible |
| B. | irreversible and possible |
| C. | impossible |
| D. | reversible |
| Answer» C. impossible | |
| 10. |
If the cyclic integral of dQ/T is zero then the cycle is |
| A. | irreversible but not possible |
| B. | irreversible but possible |
| C. | impossible |
| D. | reversible |
| Answer» E. | |
| 11. |
Which of the following is known as the inequality of Clausius? |
| A. | cyclic integral of dQ/T<=0 |
| B. | cyclic integral of dQ/T>=0 |
| C. | cyclic integral of dW/T<=0 |
| D. | cyclic integral of dW/T>=0 |
| Answer» B. cyclic integral of dQ/T>=0 | |
| 12. |
The cyclic integral of entropy is____ |
| A. | one |
| B. | zero |
| C. | infinity |
| D. | cannot be determined |
| Answer» C. infinity | |
| 13. |
The efficiency of a general cycle will be _____ the efficiency of a reversible cycle. |
| A. | equal to |
| B. | less than |
| C. | equal to or greater than |
| D. | equal to or less than |
| Answer» E. | |
| 14. |
Two reversible adiabatic paths can intersect each other. |
| A. | true |
| B. | false |
| Answer» C. | |
| 15. |
According to the Clausius’ theorem, the cyclic integral of ____ for a reversible cycle is zero.$ |
| A. | dW/dT |
| B. | dH/dT |
| C. | dQ/dT |
| D. | dE/dT |
| Answer» D. dE/dT | |
| 16. |
Any reversible path can be substituted by a reversible zigzag path between the same states. |
| A. | true |
| B. | false |
| Answer» B. false | |