MCQOPTIONS
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MCQOPTIONS
This section includes 68 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Dynamics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A circular solid disc of uniform thickness 20 mm, radius 200 mm and mass 20 kg, is used as a flywheel. If it rotates at 600 rpm, the kinetic energy of the flywheel, in Joules is$ |
| A. | 395 |
| B. | 790 |
| C. | 1580 |
| D. | 3160 |
| Answer» C. 1580 | |
| 52. |
When_the_driving_torque_is_more_than_load_torque,_flywheel_is_______$ |
| A. | Accelerated |
| B. | Decelerated |
| C. | Constant velocity |
| D. | Can’t be determined |
| Answer» B. Decelerated | |
| 53. |
During the portion BC the flywheel is _____ |
| A. | Accelerated |
| B. | Decelerated |
| C. | Maintain constant speed |
| D. | None of the listed |
| Answer» E. | |
| 54. |
For a certain engine having an average speed of 1200 rpm, a flywheel approximated as a solid disc, is required for keeping the fluctuation of speed within 2% about the average speed. The fluctuation of kinetic energy per cycle is found to be 2 kJ. What is the least possible mass of the flywheel if its diameter is not to exceed 1 m ? |
| A. | 40 kg |
| B. | 51 kg |
| C. | 62 kg |
| D. | 73 kg |
| Answer» C. 62 kg | |
| 55. |
Which of the following doesn’t waste energy?# |
| A. | Flywheel |
| B. | Governor |
| C. | Both flywheel and governor |
| D. | Neither flywheel nor governor |
| Answer» B. Governor | |
| 56. |
If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will b? |
| A. | four times the first one |
| B. | same as the first one |
| C. | one fourth of the first one |
| D. | one and a half times the first one |
| Answer» D. one and a half times the first one | |
| 57. |
The operation of flywheel is continuous. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 58. |
A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by |
| A. | 2WC<sub>E</sub>/C<sub>S</sub> |
| B. | WC<sub>E</sub>/2C<sub>S</sub> |
| C. | WC<sub>E</sub>/C<sub>S</sub> |
| D. | WC<sub>S</sub>/2C<sub>E</sub> |
| Answer» C. WC<sub>E</sub>/C<sub>S</sub> | |
| 59. |
If load on the engine is constant, the mean speed will be constant and ___ will not operate. |
| A. | Flywheel |
| B. | Governor |
| C. | Both flywheel and governor |
| D. | None of the mentioned |
| Answer» C. Both flywheel and governor | |
| 60. |
Maximum fluctuation of energy in a flywheel is equal to |
| A. | Iω(ω<sub>1</sub> – ω<sub>2</sub>) |
| B. | Iω<sup>2</sup>C<sub>S</sub> |
| C. | 2EC<sub>S</sub> |
| D. | all of the mentioned |
| Answer» E. | |
| 61. |
Flywheel and governor can be interchanged. |
| A. | True |
| B. | False |
| Answer» C. | |
| 62. |
The ratio of maximum fluctuation of energy to the workdone per cycle is called |
| A. | fluctuation of energy |
| B. | maximum fluctuation of energy |
| C. | coefficient of fluctuation of speed |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 63. |
When comes down to stress reduction, which one is preferred? |
| A. | Solid flywheel |
| B. | Split flywheel |
| C. | Both have equal stresses |
| D. | Cannot be determined |
| Answer» C. Both have equal stresses | |
| 64. |
Which of the following are functions of flywheel? |
| A. | Store and release energy during work cycle |
| B. | Reduce power capacity of the electric motor |
| C. | Reduce amplitude of speed fluctuations |
| D. | All of the listed |
| Answer» E. | |
| 65. |
The co-efficient of fluctuation of energy is the ratio of maximum energy to the minimum energy. |
| A. | True |
| B. | False |
| Answer» C. | |
| 66. |
Flywheels are used in punching and shear operation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 67. |
The maximum fluctuation of energy is the |
| A. | difference between the maximum and minimum energies |
| B. | sum of the maximum and minimum energies |
| C. | variations of energy above and below the mean resisting torque to the |
| D. | ratio of the mean resisting torque to the workdone per cycle |
| Answer» B. sum of the maximum and minimum energies | |
| 68. |
In a four stroke I.C. engine, the turning moment during the compression stroke is |
| A. | positive throughout |
| B. | negative throughout |
| C. | positive during major portion of the stroke |
| D. | negative during major portion of the stroke |
| Answer» C. positive during major portion of the stroke | |