McqMate
Chapters
| 1. |
Which type of vibrations are also known as transient vibrations? |
| A. | Undamped vibrations |
| B. | Damped vibrations |
| C. | Torsional vibrations |
| D. | Transverse vibrations |
| Answer» B. Damped vibrations | |
| 2. |
During transverse vibrations, shaft is subjected to which type of stresses? |
| A. | Tensile stresses |
| B. | Torsional shear stress |
| C. | Bending stresses |
| D. | All of the above |
| Answer» C. Bending stresses | |
| 3. |
What are deterministic vibrations? |
| A. | Vibrations caused due to known exciting force |
| B. | Vibrations caused due to unknown exciting force |
| C. | Vibrations which are aperiodic in nature |
| D. | None of the above |
| Answer» A. Vibrations caused due to known exciting force | |
| 4. |
Which of the following vibrations are classified according to magnitude of actuating force? |
| A. | Torsional vibrations |
| B. | Deterministic vibrations |
| C. | Transverse vibrations |
| D. | All of the above |
| Answer» B. Deterministic vibrations | |
| 5. |
In which type of vibrations, amplitude of vibration goes on decreasing every cycle? |
| A. | Damped vibrations |
| B. | Undamped vibrations |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» A. Damped vibrations | |
| 6. |
The resonant frequency of a mass-spring system depends upon ________ |
| A. | stiffness |
| B. | surface density |
| C. | depth of air space |
| D. | all of the above |
| Answer» D. all of the above | |
| 7. |
Calculate equivalent stiffness of the spring for the system shown below, which has spring stiffness of 3000 N/m |
| A. | 1000 N/m |
| B. | 2250 N/m |
| C. | 2000 N/m |
| D. | None of the above |
| Answer» B. 2250 N/m | |
| 8. |
Which of the following is incorrect regarding inertia force? |
| A. | Imaginary force |
| B. | Acts upon a rigid body |
| C. | Brings the body to equilibrium |
| D. | Same direction as of accelerating force |
| Answer» D. Same direction as of accelerating force | |
| 9. |
D-Alembert’s principle is used for which of the following? |
| A. | Change static problem into a dynamic problem |
| B. | Change dynamic problem to static problem |
| C. | To calculate moment of inertia of rigid bodies |
| D. | To calculate angular momentum of a system of masses |
| Answer» B. Change dynamic problem to static problem | |
| 10. |
Determine logarithmic decrement, if the amplitude of a vibrating body reduces to 1/6th in two cycles. |
| A. | 0.223 |
| B. | 0.8958 |
| C. | 0.389 |
| D. | None of the above |
| Answer» B. 0.8958 | |
| 11. |
Calculate logarithmic decrement if damping factor is 0.33. |
| A. | 1.36 |
| B. | 3.23 |
| C. | 5.16 |
| D. | 2.19 |
| Answer» D. 2.19 | |
| 12. |
In damped free vibrations, which parameters indicate vibrations? |
| A. | Natural frequency |
| B. | Rate of decay of amplitude |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Rate of decay of amplitude | |
| 13. |
What is meant by critical damping coefficient? |
| A. | Frequency of damped free vibrations is less than zero |
| B. | The motion is aperiodic in nature |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. The motion is aperiodic in nature | |
| 14. |
Which of the following relations is true for viscous damping? |
| A. | Force α relative displacement |
| B. | Force α relative velocity |
| C. | Force α (1 / relative velocity) |
| D. | None of the above |
| Answer» B. Force α relative velocity | |
| 15. |
Which among the following is the value of static deflection (δ) for a fixed beam with central point load? |
| A. | (Wl3) /(192 EI) |
| B. | (Wl2) /(192 EI) |
| C. | (Wl3) /(384 EI) |
| D. | None of the above |
| Answer» A. (Wl3) /(192 EI) | |
| 16. |
According to which method, maximum kinetic energy at mean position is equal to maximum potential energy at extreme position? |
| A. | Energy method |
| B. | Rayleigh's method |
| C. | Equilibrium method |
| D. | All of the above |
| Answer» B. Rayleigh's method | |
| 17. |
The motion of a system executing harmonic motion with one natural frequency is known as _______ |
| A. | principal mode of vibration |
| B. | natural mode of vibration |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 18. |
Fluid resistance causes damping which is known as ______ |
| A. | Resistance damping |
| B. | Fluid damping |
| C. | Viscous damping |
| D. | Liquid damping |
| Answer» C. Viscous damping | |
| 19. |
In which direction does the accelerating force acts? |
| A. | Opposite to the motion |
| B. | Along the motion |
| C. | Perpendicular to motion |
| D. | Variable |
| Answer» B. Along the motion | |
| 20. |
The time interval after which the motion is repeated itself is known as ___________ . |
| A. | Time period |
| B. | Cycle |
| C. | Frequency |
| D. | Isolation |
| Answer» A. Time period | |
| 21. |
Frequency of vibrations is usually expressed in |
| A. | Number of cycles per hour |
| B. | Number of cycles per minute |
| C. | Number of cycles per second |
| D. | None of these |
| Answer» C. Number of cycles per second | |
| 22. |
The motion completed during one time period is known as _______. |
| A. | Period of vibration |
| B. | Cycle |
| C. | Frequency |
| D. | All of the above |
| Answer» B. Cycle | |
| 23. |
Which of the following is a type of free vibration? |
| A. | Longitudinal vibrations |
| B. | Transverse vibrations |
| C. | Torsional vibrations |
| D. | A, B and C |
| Answer» D. A, B and C | |
| 24. |
In a spring-mass system, which of the following force is not considered? |
| A. | Spring force |
| B. | Damping force |
| C. | Accelerating force |
| D. | A and B |
| Answer» B. Damping force | |
| 25. |
The periodic time is given by _______. |
| A. | ω / 2 π |
| B. | 2 π / ω |
| C. | 2 π × ω |
| D. | π/ω |
| Answer» B. 2 π / ω | |
| 26. |
The velocity of a particle moving with simple harmonic motion is _______ at the mean position. |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of the mentioned |
| Answer» C. Maximum | |
| 27. |
The maximum acceleration of a particle moving with simple harmonic motion is ____. |
| A. | ω |
| B. | ω.r |
| C. | ω / 2 π |
| D. | 2 π / ω |
| Answer» B. ω.r | |
| 28. |
At the mean position, the potential energy of the system is _______. |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of the mentioned |
| Answer» A. Zero | |
| 29. |
In a spring-mass-damper system, which of the following force is considered? |
| A. | Spring force |
| B. | Damping force |
| C. | Accelerating force |
| D. | All of the above |
| Answer» D. All of the above | |
| 30. |
Frequency is equal to ______. |
| A. | Time period |
| B. | 1/time period |
| C. | ω * time period |
| D. | ω /time period |
| Answer» B. 1/time period | |
| 31. |
When the body vibrates under the influence of external force, then the body is said to be under ___________ . |
| A. | Free vibrations |
| B. | Natural vibrations |
| C. | Forced vibrations |
| D. | Damped vibrations |
| Answer» C. Forced vibrations | |
| 32. |
A vertical spring-mass system has a mass of 0.5 kg and an initial deflection of 0.2 cm. Find the spring stiffness. |
| A. | 345 N/m |
| B. | 245 N/m |
| C. | 3452 N/m |
| D. | 2452 N/m |
| Answer» D. 2452 N/m | |
| 33. |
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» C. 11.14 Hz | |
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