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. |
In a three rotor system, for the middle rotor, if the stiffness of both the length either side of the rotor is increased to two times what will be the effect on total stiffness of the middle rotor? |
| A. | Remains constant |
| B. | Decreases by two times |
| C. | Increases by two times |
| D. | Increases by 4 times |
| Answer» D. Increases by 4 times | |
| 2. |
For a three rotor system in the figure given below, the length of one shaft(P) is twice the other(Q), then what is the relation between the Mass moment of inertia of the shafts. |
| A. | 2I(P) = I(Q) |
| B. | I(P) = 2I(Q) |
| C. | I(P) = I(Q) |
| D. | 2I(P) = 3I(Q) |
| Answer» B. I(P) = 2I(Q) | |
| 3. |
What is the total number of nodes formed in a three rotor system if the rotors at one of the ends and the one in the middle rotate in the same direction? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 4. |
Free torsional vibrations will occur in a three rotor system only if all rotors have same frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Keeping the mass moment of inertia of left end and the right end shafts in a three rotor system same, if the length of one shaft is doubled what should be the effect on the length of other shaft? |
| A. | Doubled |
| B. | Halved |
| C. | Constant |
| D. | Increased to 4 times |
| Answer» B. Halved | |
| 6. |
In the given figure if N1 is the node then N1Q acts as which of the following system? |
| A. | Single rotor system |
| B. | Two rotor system |
| C. | Three rotor system |
| D. | Four rotor system |
| Answer» C. Three rotor system | |
| 7. |
the given figure, considering left end has one rotor, If the mass moment of inertia of the shaft till node N1 is increased to four times, then what will be the effect on free torsional vibrations of a rotor at left end of N1? |
| A. | Increases 4 times |
| B. | Increases 2 times |
| C. | Decreases 4 times |
| D. | Decreases 2 times |
| Answer» E. | |
| 8. |
For occurrence of free torsional vibration in a three rotor system which of the condition is necessary? |
| A. | Rotors moving in same direction |
| B. | Rotors having same frequency |
| C. | Rotors having different frequency |
| D. | Rotors rotate in the same sense |
| Answer» C. Rotors having different frequency | |
| 9. |
In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction. |
| A. | B in clockwise C in anticlockwise |
| B. | C in clockwise B in anticlockwise |
| C. | B and C in clockwise |
| D. | B and C in anticlockwise |
| Answer» D. B and C in anticlockwise | |
| 10. |
In a three rotor system, free torsional vibration cannot occur if there is only one node. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
In the figure given below, the points N1 and N2 are known as_______ |
| A. | Nodes |
| B. | Elastic points |
| C. | Inelastic points |
| D. | Breaking points |
| Answer» B. Elastic points | |