McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
The secondary winding of ignition coil consists of |
| A. | few turns of fine wire |
| B. | few turns of thick wire |
| C. | many turns of fine wire |
| D. | many turns of thick wire |
| Answer» C. many turns of fine wire | |
| 2. |
Dwell is the time |
| A. | for which the points remain closed |
| B. | for which the points remain open |
| C. | time during which inlet and exhaust valves are open |
| D. | none of the above |
| Answer» A. for which the points remain closed | |
| 3. |
Dwell period |
| A. | is directly proportional to engine speed |
| B. | is inversely proportional to engine speed |
| C. | does not depend on engine speed |
| D. | none of the above |
| Answer» B. is inversely proportional to engine speed | |
| 4. |
If the contact breaker gap is small, it results in |
| A. | advanced timing |
| B. | increased dwell |
| C. | rapid burning of the pointer gaps |
| D. | none of the above |
| Answer» C. rapid burning of the pointer gaps | |
| 5. |
For a four cylinder engine operating at N rpm, the contact breaker must make and break the circuit |
| A. | N times |
| B. | 2N times |
| C. | N/2 times |
| D. | none of the above |
| Answer» B. 2N times | |
| 6. |
Contact breaker should be set |
| A. | just before starting the engine |
| B. | before adjustment of dwell angle |
| C. | after adjustment of dwell angle |
| D. | before setting spark plug gap |
| Answer» C. after adjustment of dwell angle | |
| 7. |
Dwell meter is used for |
| A. | setting spark plug gap |
| B. | contact breaker gap |
| C. | setting the ignition advance |
| D. | setting |
| Answer» B. contact breaker gap | |
| 8. |
For a four cylinder vertical engine, the commonly used firing order is |
| A. | 1-2-3-4 |
| B. | 3-4-1-2 |
| C. | 1-3-4-2 |
| D. | 4-3-2-1 |
| Answer» C. 1-3-4-2 | |
| 9. |
For engine operating with rich mixtures the optimum spark timing |
| A. | must be advanced |
| B. | must be retarded |
| C. | must be at TDC |
| D. | none of the above |
| Answer» A. must be advanced | |
| 10. |
For peak lead operation, the spark advance |
| A. | must be decreased |
| B. | must be increased |
| C. | need not be altered |
| D. | none of the above |
| Answer» A. must be decreased | |
| 11. |
Ignition timing is adjusted by |
| A. | tachometer |
| B. | stroboscopic light |
| C. | stop watch |
| D. | accurate clock |
| Answer» B. stroboscopic light | |
| 12. |
Vacuum advance mechanism shifts the ignition point under |
| A. | no load operation |
| B. | full load operation |
| C. | part load operation |
| D. | under sudden acceleration |
| Answer» C. part load operation | |
| 13. |
Which of the following statement is wrong? |
| A. | retarded timing causes exhaust gas temperature to be higher |
| B. | retarded timing improves fuel economy |
| C. | retarded timing requires slightly longer throttle opening |
| D. | retarded timing causes burning of the hydrocarbons in the exhaust |
| Answer» D. retarded timing causes burning of the hydrocarbons in the exhaust | |
| 14. |
Choose the correct statement from the following |
| A. | maintenance problem in magneto-ignition system is more |
| B. | magneto ignition system occupies more space |
| C. | magneto ignition system is used in larger four wheelers |
| D. | magneto ignition system has poor quality of spark during starting |
| Answer» D. magneto ignition system has poor quality of spark during starting | |
| 15. |
Battery ignition system |
| A. | occupies more space |
| B. | has more maintenance problem |
| C. | is commonly employed in four wheelers |
| D. | all of the above |
| Answer» D. all of the above | |
| 16. |
Method of governing used in petrol engine is |
| A. | hit and miss governing. |
| B. | quality governing |
| C. | quantity governing |
| D. | none of above |
| Answer» C. quantity governing | |
| 17. |
Pick up the false statement |
| A. | Thermal efficiency of diesel engine i about 34% |
| B. | Theoretically correct mixture of air am petrol is approximately 15 : 1 |
| C. | High speed compression engines operate on dual combustion cycle |
| D. | S.I. engines are quality-governed engines. |
| Answer» D. S.I. engines are quality-governed engines. | |
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