MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Dynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When the primary direct crank of a reciprocating engine makes an angle θ with the line of stroke, then the secondary direct crank will make an angle of . . . . . with the line of stroke. |
| A. | θ /2 |
| B. | θ |
| C. | 2 θ |
| D. | 4 θ |
| Answer» D. 4 θ | |
| 2. |
Multi-cylinder engines are desirable becausea) only balancing problems are reducedb) only flywheel size is reducedc) both ( |
| A. | only balancing problems are reducedb) only flywheel size is reducedc) both (a) and ( |
| B. | only flywheel size is reduced |
| C. | both (a) and (b) |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 3. |
Which of the following statements are associated with complete dynamic balancing of rotating systems?1. Resultant couple due to all inertia forces is zero.2. Support reactions due to forces are zero but not due to couples.3. The system is automatically statically balanced.4. Centre of masses of the system lies on the axis of rotation. |
| A. | 1, 2, 3 and 4 |
| B. | 1, 2, and 3 only |
| C. | 2, 3 and 4 only |
| D. | 1, 3 and 4 only |
| Answer» E. | |
| 4. |
SECONDARY_FORCES_IN_RECIPROCATING_MASS_ON_ENGINE_FRAME_ARE?$ |
| A. | of same frequency as of primary forces |
| B. | twice the frequency as of primary forces |
| C. | four times the frequency as of primary forces |
| D. | none of the mentioned |
| Answer» C. four times the frequency as of primary forces | |
| 5. |
The secondary unbalanced force produced by the reciprocating parts of a certain cylinder of a given engine with crank radius r and connecting rod length l can be considered as equal to primary unbalanced force produced by the same weight having$ |
| A. | an equivalent crank radius r<sup>2</sup>/4l and rotating at twice the speed of the engine |
| B. | r<sup>2</sup>/4l as equivalent crank radius and rotating at engine speed |
| C. | equivalent crank length of r<sup>2</sup>/4l and rotating at engine speed |
| D. | none of the mentioned |
| Answer» B. r<sup>2</sup>/4l as equivalent crank radius and rotating at engine speed | |
| 6. |
When the primary direct crank of a reciprocating engine makes an angle θ with the line of stroke, then the secondary direct crank will make an angle of . . . . . with the line of stroke?# |
| A. | θ /2 |
| B. | θ |
| C. | 2 θ |
| D. | 4 θ |
| Answer» D. 4 ‚âà√≠‚Äö√†√® | |
| 7. |
Multi-cylinder engines are desirable because |
| A. | only balancing problems are reduced |
| B. | only flywheel size is reduced |
| C. | both (a) and (b) |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 8. |
In case of partial balancing of locomotives, the maximum magnitude of the unbalanced force perpendicular to the line of stroke is called hammer blow and this has to be limited by proper choice of the balancing mass and its radial position. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
In balancing of single-cylinder engine, the rotating unbalance is |
| A. | completely made zero and so also the reciprocating unbalance |
| B. | completely made zero and the reciprocating unbalance is partially reduced |
| C. | partially reduced and the reciprocating unbalance is completely made zero |
| D. | partially reduced and so also the reciprocating unbalance |
| Answer» C. partially reduced and the reciprocating unbalance is completely made zero | |
| 10. |
The magnitude of swaying couple due to partial balance of the primary unbalancing force in locomotive is |
| A. | inversely proportional to the reciprocating mass |
| B. | directly proportional to the square of the distance between the centre lines of the two cylinders |
| C. | inversely proportional to the distance between the centerlines of the two cylinders |
| D. | directly proportional to the distance between the centerlines of the two cylinders |
| Answer» E. | |
| 11. |
Which of the following statements is correct about the balancing of a mechanical system? |
| A. | If it is under static balance, then there will be dynamic balance also |
| B. | If it is under dynamic balance, then there will be static balance also |
| C. | Both static as well as dynamic balance have to be achieved separately |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |