MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Ic Engine knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
ABNORMAL_COMBUSTION_KNOCK_PRODUCED_BY_SURFACE_IGNITION_IN_SI_ENGINES_IS_NOT_HARMFUL_AS_NORMAL_COMBUSTION_KNOCK.?$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Swirl ratio is defined as the ratio of air rotational speed to crankshaft rotational speed? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
When ignition occurs the nucleus of the flame spreads with the whirling or rotating vortices in the form of ragged burning crust from the initial spark plug ignition site. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
The flame propagation velocities range from |
| A. | 10 to 15 m/s |
| B. | 15 to 70 m/s |
| C. | 20 to 80 m/s |
| D. | 30 to 90 m/s |
| Answer» B. 15 to 70 m/s | |
| 5. |
Turbulence decreases the heat flow to the cylinder wall and in the limit excessive turbulence may extinguish the flame. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
The degree of turbulence increases _____________ with the piston speed. |
| A. | indirectly |
| B. | directly |
| C. | linearly |
| D. | none of the mentioned |
| Answer» C. linearly | |
| 7. |
The amount of vortex activity,and the disintegration of others, _____________ the turbulent flow with rising engine speed. |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 8. |
____________ consists of randomly dispersed vortices of different sizes which become superimposed into the air and petrol mixture flow stream. |
| A. | Turbulence |
| B. | Swirl |
| C. | Quench area |
| D. | None of the mentioned |
| Answer» B. Swirl | |
| 9. |
The _____________ is defined by the parallel portion of the piston and cylinder head which almost touch each other as the piston approaches T.D.C. |
| A. | turbulence |
| B. | swirl |
| C. | quench area |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 10. |
Swirl is the rotational flow of charge within the cylinder about the axis. |
| A. | True |
| B. | False |
| Answer» B. False | |