MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
ɣ ____ with temperature. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» C. remains constant | |
| 2. |
The premature ignition of fuel is called ____ |
| A. | engine knock |
| B. | auto-ignition |
| C. | detonation |
| D. | all of the mentioned |
| Answer» C. detonation | |
| 3. |
Detonation in SI engine is |
| A. | noisy and destructive combustion phenomenon |
| B. | limits the compression ratio |
| C. | it depends on engine design and fuel |
| D. | all of the mentioned |
| Answer» E. | |
| 4. |
The constant volume pressure ratio is given by the ratio of pressures of constant volume heat addition. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 5. |
In Dual cycle, |
| A. | all the heat is added at constant volume |
| B. | all the heat is added at constant pressure |
| C. | some heat is added at constant volume and remaining at constant pressure |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 6. |
THE_CONSTANT_VOLUME_PRESSURE_RATIO_IS_GIVEN_BY_THE_RATIO_OF_PRESSURES_OF_CONSTANT_VOLUME_HEAT_ADDITION.?$ |
| A. | true |
| B. | false |
| Answer» B. false | |
| 7. |
The premature ignition of fuel is called ____$ |
| A. | engine knock |
| B. | auto-ignition |
| C. | detonation |
| D. | all of the mentioned |
| Answer» C. detonation | |
| 8. |
Detonation_in_SI_engine_is$ |
| A. | noisy and destructive combustion phenomenon |
| B. | limits the compression ratio |
| C. | it depends on engine design and fuel |
| D. | all of the mentioned |
| Answer» E. | |
| 9. |
…£ ____ with temperature.$ |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» C. remains constant | |
| 10. |
For a given compression raise, the highest efficiency can be obtained by using |
| A. | triatomic gases |
| B. | diatomic gases |
| C. | monoatomic gases |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 11. |
Many a times, tetraethyl ether is added to gasoline. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 12. |
The auto-ignition |
| A. | reduces performance of engine |
| B. | can cause damage to engine |
| C. | sets upper limit to compression ratios used in SI engines |
| D. | all of the mentioned |
| Answer» E. | |
| 13. |
In Dual cycle? |
| A. | all the heat is added at constant volume |
| B. | all the heat is added at constant pressure |
| C. | some heat is added at constant volume and remaining at constant pressure |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 14. |
The efficiency of Diesel cycle is ____ the efficiency of Otto cycle. |
| A. | less than |
| B. | greater than |
| C. | equal to |
| D. | none of the mentioned |
| Answer» B. greater than | |
| 15. |
Which of the following is the relation between compression ratio, expansion ratio and cut-off ratio? |
| A. | rc=(rk)*(re) |
| B. | re=(rk)*(rc) |
| C. | rk=(re)*(rc) |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 16. |
The Diesel cycle consists of |
| A. | two reversible isotherms and two reversible isobars |
| B. | one reversible isochore and two reversible adiabatics and one reversible isobar |
| C. | one reversible isotherm and two reversible isochores and one reversible isobar |
| D. | two reversible isobars and two reversible adiabatics |
| Answer» C. one reversible isotherm and two reversible isochores and one reversible isobar | |
| 17. |
The processes in CI engine cycle is completed in ____ strokes of piston and ____ revolutions of crankshaft. |
| A. | four, four |
| B. | two, two |
| C. | two, four |
| D. | four, two |
| Answer» E. | |
| 18. |
The correct sequence of processes in CI engine is |
| A. | intake->fuel injection and combustion->compression->expansion->exhaust |
| B. | intake->compression->fuel injection and combustion->expansion->exhaust |
| C. | intake->compression->expansion->fuel injection and combustion->exhaust |
| D. | intake->compression->exhaust->fuel injection and combustion->expansion |
| Answer» C. intake->compression->expansion->fuel injection and combustion->exhaust | |
| 19. |
In CI engines, |
| A. | during compression stroke, only air is compressed |
| B. | compression ratios can be much higher |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 20. |
In SI engines, |
| A. | air-fuel mixture is compressed |
| B. | compression ratio is limited |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |