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 vibration isolation system, if ω/ωn is less than √2 , then for all values of the damping factor, the transmissibility will be |
| A. | less than unity |
| B. | equal to unity |
| C. | greater than unity |
| D. | zerowhere ω = Circular frequency of the system in rad/s, andωn = Natural circular frequency of vibration of the system in rad/s. |
| Answer» D. zerowhere ω = Circular frequency of the system in rad/s, andωn = Natural circular frequency of vibration of the system in rad/s. | |
| 2. |
The equation of motion for a vibrating system with viscous damping is d2x/dt2 + c/m X dx/dt + s/m X x = 0If the roots of this equation are real, then the system will be |
| A. | over damped |
| B. | under damped |
| C. | critically damped |
| D. | none of the mentioned |
| Answer» B. under damped | |
| 3. |
IN_VIBRATION_ISOLATION_SYSTEM,_IF_‚ÂÀ√¨‚ÀÖ¬¢/‚ÂÀ√¨‚ÀÖ¬¢N_>_1,_THEN_THE_PHASE_DIFFERENCE_BETWEEN_THE_TRANSMITTED_FORCE_AND_THE_DISTURBING_FORCE_IS?$# |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | 270° |
| Answer» D. 270¬¨¬®‚Äö√†√ª | |
| 4. |
IN_VIBRATION_ISOLATION_SYSTEM,_IF_‚ÂÀ√¨‚ÀÖ¬¢/‚ÂÀ√¨‚ÀÖ¬¢N_IS_LESS_THAN_‚ÄÖ√Ñ√∂‚ÀւĆ‚ÀÖ‚ÀÇ2_,_THEN_FOR_ALL_VALUES_OF_THE_DAMPING_FACTOR,_THE_TRANSMISSIBILITY_WILL_BE?$# |
| A. | less than unity |
| B. | equal to unity |
| C. | greater than unity |
| D. | zero |
| Answer» D. zero | |
| 5. |
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known a? |
| A. | damping factor |
| B. | damping coefficient |
| C. | logarithmic decrement |
| D. | magnification factor |
| Answer» E. | |
| 6. |
In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to |
| A. | x<sub>1</sub>/x<sub>2</sub> |
| B. | log (x<sub>1</sub>/x<sub>2</sub>) |
| C. | loge (x<sub>1</sub>/x<sub>2</sub>) |
| D. | log (x<sub>1</sub>.x<sub>2</sub>) |
| Answer» C. loge (x<sub>1</sub>/x<sub>2</sub>) | |
| 7. |
The equation of motion for a vibrating system with viscous damping is |
| A. | |
| B. | |
| Answer» B. | |
| 8. |
The factor which affects the critical speed of a shaft is |
| A. | diameter of the disc |
| B. | span of the shaft |
| C. | eccentricity |
| D. | all of the mentioned |
| Answer» E. | |
| 9. |
The natural frequency (in Hz) of free longitudinal vibrations is equal to |
| A. | 1/2π√s/m |
| B. | 1/2π√g/δ |
| C. | 0.4985/δ |
| D. | all of the mentioned |
| Answer» E. | |
| 10. |
Longitudinal vibrations are said to occur when the particles of a body moves |
| A. | perpendicular to its axis |
| B. | parallel to its axis |
| C. | in a circle about its axis |
| D. | none of the mentioned |
| Answer» C. in a circle about its axis | |
| 11. |
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have |
| A. | free vibration |
| B. | forced vibration |
| C. | damped vibration |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |