McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
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 | |
| 34. |
What is meant by node point? |
| A. | The point at which amplitude of vibration is maximum |
| B. | The point at which amplitude of vibration is minimum |
| C. | The point at which amplitude of vibration is zero |
| D. | None of the above |
| Answer» C. The point at which amplitude of vibration is zero | |
| 35. |
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. | |
| 36. |
Which of the following statements is/are true? |
| A. | Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction |
| B. | Shaft vibrates with maximum frequency when rotors rotate in same direction |
| C. | Zero node behavior is observed in rotors rotating in opposite direction |
| D. | All of the above |
| Answer» A. Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction | |
| 37. |
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» B. Two node vibration | |
| 38. |
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» B. 1 | |
| 39. |
In a multi-rotor system of torsional vibration maximum number of nodes that can occur is: |
| A. | Two |
| B. | Equal to the number of rotor plus one |
| C. | Equal to the number of rotors |
| D. | Equal to the number of rotors minus one |
| Answer» D. Equal to the number of rotors minus one | |
| 40. |
During torsional vibration of a shaft, the node is characterized by |
| A. | Maximum angular velocity |
| B. | Maximum angular displacement |
| C. | Maximum angular acceleration |
| D. | Zero angular displacement |
| Answer» D. Zero angular displacement | |
| 41. |
The mass moment of inertia of the two motors in a two rotor system are 100 kgm2 and 10 kgm2 the length of the shaft of uniform |
| A. | 80 cm |
| B. | 90 cm |
| C. | 100 cm |
| D. | 110 cm |
| Answer» C. 100 cm | |
| 42. |
What is the number of nodes in a shaft carrying three rotors? |
| A. | zero |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 43. |
Consider the following statements: Two rotors mounted on a single shaft can be considered to be equivalent to a geared-shaft system having two rotors provided 1. The kinetic energy of the equivalent system is equal to that of the original system. 2. The strain energy of the equivalent system is equal to that of the original system. 3. The shaft diameters of the two systems are equal. Which of these statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» A. 1, 2 and 3 | |
| 44. |
Two rotors A and B are connected to the two ends of a shaft of uniform diameter. The mass moment of inertia of rotor A about the |
| A. | 1/5 m |
| B. | 4/5 m |
| C. | 1/25 m |
| D. | 16/25 m |
| Answer» A. 1/5 m | |
| 45. |
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» B. It has one node | |
| 46. |
A system, which is free from both the ends |
| A. | Definite system |
| B. | Semidefinite system |
| C. | Both a and b |
| D. | None of the above |
| Answer» B. Semidefinite system | |
| 47. |
A system, which is fixed from one end or both the ends is referred as |
| A. | Definite system |
| B. | Semidefinite system |
| C. | Both a and b |
| D. | None of the above |
| Answer» A. Definite system | |
| 48. |
In a system with different shaft parameters, the longest shaft is taken for calculations. |
| A. | TRUE |
| B. | FALSE |
| Answer» B. FALSE | |
| 49. |
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» A. Equivalent shaft length | |
| 50. |
From the following data, calculate the location of node from the left end of shaft (l1).l1=0.6m, l2=0.5m, l3=0.4m d1=0.095m, d2=0.06m, d3=0.05m Ma = 900 Kg, Mb = 700 Kg ka = 0.85m, kb = 0.55m |
| A. | 0.855m |
| B. | 0.795m |
| C. | 0.695m |
| D. | 0.595m |
| Answer» A. 0.855m | |
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