MCQOPTIONS
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MCQOPTIONS
This section includes 61 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
For occurrence of free torsional vibration 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 | |
| 52. |
For a vibration system having different shaft parameters, calculate which of the following cannot be the diameter of the equivalent shaft if the diameters of shafts in m are: 0.05, 0.06, 0.07. |
| A. | 0.05 |
| B. | 0.06 |
| C. | 0.07 |
| D. | 0.08 |
| Answer» E. | |
| 53. |
In a system with different shaft parameters ------------- is taken which depends on the length and diameters of each shaft. |
| A. | Equivalent shaft length |
| B. | length of first shaft |
| C. | lrngth of intermediate shaft |
| D. | None of these |
| Answer» B. length of first shaft | |
| 54. |
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 |
| A. | Remains constant |
| B. | Decreases by two times |
| C. | Increases by two times |
| D. | Increases by 4 times |
| Answer» D. Increases by 4 times | |
| 55. |
In the diagram shown below, if rotor X and rotor Z rotate in same direction and rotor Y rotates in opposite direction, then specify the type of node vibration. |
| A. | Three node vibration |
| B. | Two node vibration |
| C. | Single node vibration |
| D. | None of the above |
| Answer» C. Single node vibration | |
| 56. |
In a system with different shaft parameters, the longest shaft is taken for calculations. |
| A. | TRUE |
| B. | FALSE |
| Answer» C. | |
| 57. |
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 |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 58. |
Which one of the following is correct for a shaft carrying two rotors at its ends? |
| A. | It has no node |
| B. | It has one node |
| C. | It has two nodes |
| D. | It has three nodes |
| Answer» C. It has two nodes | |
| 59. |
The instruments which are used to measure the ___________ of a vibrating body are called vibration measuring instrument. |
| A. | displacement |
| B. | velocity |
| C. | acceleration |
| D. | all of the above |
| Answer» E. | |
| 60. |
A system has a mass of 0.5 kg and spring stiffness of 2452 N/m. Find the natural frequency of the system. |
| A. | 5.14 Hz |
| B. | 9.14 Hz |
| C. | 11.14 Hz |
| D. | 28.14 Hz |
| Answer» D. 28.14 Hz | |
| 61. |
In the given figure, m1=10 Kg, m2=30Kg and m=50 Kg, if r=0.3m, l=1m, find l2 = 0.5m, find r1 in m. |
| A. | 1.5 |
| B. | 0.75 |
| C. | 3 |
| D. | 6 |
| Answer» C. 3 | |