MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering (MCQ) questions and answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following statements is/are true primary/secondary couple?1. Secondary couple does not act on V engine2. Primary couple acts on V engine3. Secondary couple acts on reciprocating masses of multi-cylinder inline engines4. Primary couple acts on reciprocating masses of multi-cylinder inline engines |
| A. | 1 and 2 |
| B. | 2, 3 and 4 |
| C. | 1, 3 and 4 |
| D. | All of the above |
| Answer» D. All of the above | |
| 2. |
When frequency ratio ( / ) is greater than unity, phase angle decreases as ______ |
| A. | damping factor increases |
| B. | damping factor decreases |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. damping factor decreases | |
| 3. |
What is the effect of damping on phase angle at reso ce frequency? |
| A. | Phase angle increases as damping increases |
| B. | Damping has no effect on phase angle |
| C. | Phase angle increases as damping decreases |
| D. | None of the above |
| Answer» C. Phase angle increases as damping decreases | |
| 4. |
Calculate damped natural frequency, if a spring mass damper system is subjected to periodic disturbing force of 30 N. Damping coefficient is equal to 0.76 times of critical damping coefficient and undamped natural frequency is5 rad/sec |
| A. | 3.99 rad/sec |
| B. | 2.13 rad/sec |
| C. | 4.12 rad/sec |
| D. | 3.24 rad/sec |
| Answer» E. | |
| 5. |
Which of the following conditions should be satisfied for static balancing?1. Dynamic forces acting on the system should be zero2. Couple acting on the system due to dynamic force should be zero3. Centrifugal forces acting on the system should be zero4. Couple acting on the system due to centrifugal forces should be zero |
| A. | Condition 1 and condition 2 |
| B. | Condition 1 and condition 3 |
| C. | Condition 3 and condition 4 |
| D. | All of the above |
| Answer» C. Condition 3 and condition 4 | |
| 6. |
Determine magnitude of balancing mass required if 250 mm is the radius of rotation. Masses of A, B and C are 300 kg, 250 kg and 100 kg which have radii of rotation as50 mm, 80 mm and 100 mm respectively . The angles between the consecutive masses are 110 and 270 respectively. |
| A. | 45.36 kg |
| B. | 47.98 kg |
| C. | 40.50 kg |
| D. | None of the above |
| Answer» C. 40.50 kg | |
| 7. |
= (W ab) / (3 EIl) is the value of deflection for ______ |
| A. | simply supported beam which has central point load |
| B. | simply supported beam which has eccentric point load |
| C. | simply supported beam which has U.D.L. point load per unit length |
| D. | fixed beam which has central point load |
| Answer» C. simply supported beam which has U.D.L. point load per unit length | |
| 8. |
Which formula is used to calculate mass moment of inertia (I) of a circular rim about the axis through centre of gravity? |
| A. | mr |
| B. | mr |
| C. | mr |
| D. | mr |
| Answer» B. mr | |
| 9. |
The equation m(dx/ dt) + c (dx/dt) + Kx = F sin t is a second order differential equation. The solution of this linear equation is given as |
| A. | complementary function |
| B. | particular function |
| C. | sum of complementary and particular function |
| D. | difference of complementary and particular function |
| Answer» D. difference of complementary and particular function | |
| 10. |
Consider the steady-state absolute amplitude equation shown below, if / = 2then amplitude ratio (X/Y) =?(X/Y) = {1 + [ 2 ( / )]} / {[1 ( / )]+ {2 ( / )} |
| A. | 0 |
| B. | 1 |
| C. | less than 1 |
| D. | greater than 1 |
| Answer» C. less than 1 | |
| 11. |
Which of the following statements is/are true?1. Magnification factor is minimum at reso ce2. The maximum value of amplification factor increases as damping factor decreases 3. The maximum value of amplification factor increases as damping factor increases4. Magnification factor is maximum at reso ce |
| A. | Statement 1 and statement 2 |
| B. | Statements 1,2 and 3 |
| C. | Statement 2 and statement 4 |
| D. | All the above statements are true |
| Answer» D. All the above statements are true | |
| 12. |
Simulation is a process which_________ |
| A. | involves formation of a prototype |
| B. | explores behavior of a model by varying input variables |
| C. | develops geometry of an object |
| D. | all of the above |
| Answer» C. develops geometry of an object | |
| 13. |
Which of the following statements is/are false for pneumatic isolators ?1. Pneumatic isolators are used when driving frequencies below 10 Hz are present2. Nausea is caused due to noise at low frequencies 3. At high natural frequencies, isolators can obtain efficiency of 90%4. Pneumatic isolators have limited load carrying capacity |
| A. | Only statement 1 |
| B. | Only statement 3 |
| C. | Only statement 2, 4 |
| D. | All the above statements are false |
| Answer» C. Only statement 2, 4 | |
| 14. |
A vibrating machine of 100 kg is mounted on a rubber pad which has stiffness of 500 N/m. Determine force transmitted to the foundation if the unbalanced force 500 N acts on it. The frequency ratio ( / ) is 1.5 and = 0.5 |
| A. | 461.62 N |
| B. | 400.23 N |
| C. | 450 N |
| D. | Insufficient data |
| Answer» B. 400.23 N | |
| 15. |
Which of the following vibrometers have frequency ratio ( / ) |
| A. | Accelerometers |
| B. | Velometers |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Velometers | |
| 16. |
Eddy current damping is an example of_____ |
| A. | Coulomb damping |
| B. | Hysteresis damping |
| C. | Viscous damping |
| D. | Dry friction damping |
| Answer» D. Dry friction damping | |
| 17. |
Sound wave has a frequency of 8 kHz at 22 C. Determine its wavelength. |
| A. | 0.043 m |
| B. | 0.039 m |
| C. | 0.125 m |
| D. | 0.0125 m |
| Answer» B. 0.039 m | |
| 18. |
Determine velocity of sound in air at 50.(For air, = 1.4) |
| A. | 1002.5 m/s |
| B. | 360.45 m/s |
| C. | 350 m/s |
| D. | None of the above |
| Answer» C. 350 m/s | |
| 19. |
Which of the following statements is/are true for coulomb damping?1. Coulomb damping occurs due to friction between two lubricated surfaces2. Damping force is opposite to the direction of motion of vibrating body 3. For smooth surfaces, coefficient of friction depends upon velocity4. Damping force depends upon the rubbing velocity between two rubbing surfaces |
| A. | Only statement 1 |
| B. | Statement 2, 3 and statement 4 |
| C. | Only statement 2 |
| D. | All the above statements are true |
| Answer» D. All the above statements are true | |
| 20. |
Determine logarithmic decrement, if the amplitude of a vibrating body reduces to 1/6 in two cycles. |
| A. | 0.223 |
| B. | 0.8958 |
| C. | 0.3890 |
| D. | None of the above |
| Answer» C. 0.3890 | |
| 21. |
The reso t frequency of a mass-spring system depends upon ________ |
| A. | stiffness |
| B. | surface density |
| C. | depth of air space |
| D. | all of the above |
| Answer» E. | |