MCQOPTIONS
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MCQOPTIONS
This section includes 16 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. |
Braking torque on the drum of shoe brake is given by |
| A. | (Normal reaction on the block) × (radius of drum) |
| B. | (Frictional force on the block) × (radius of drum) |
| C. | (Force applied at the level end) × (radius of drum) |
| D. | 2 × (Force applied at the level end) × (radius of drum) |
| Answer» C. (Force applied at the level end) × (radius of drum) | |
| 2. |
A block brake with 400 mm diameter is used to brake a torque of 100 Nm as shown in the figure. If the coefficient friction is 0.25 at the brake surface what is the value of force F to be applied at the end of the lever. |
| A. | 559.4 N |
| B. | 579.4 N |
| C. | 439.4 N |
| D. | 1000 N |
| Answer» E. | |
| 3. |
For power measurement, the following dynamometer is used when the speed is high and the viscous force is small: |
| A. | Froude water vortex dynamometer |
| B. | Tesla fluid friction dynamometer |
| C. | Rope brake dynamometer |
| D. | Amsler dynamometer |
| Answer» C. Rope brake dynamometer | |
| 4. |
A band brake having band-width of 80 mm, drum diameter of 250 mm, coefficient of friction of 0.25 and angle of wrap of 270 degrees is required to exert a friction torque of 1000 N-m. The maximum tension (in kN) developed in the band is |
| A. | 1.88 |
| B. | 3.56 |
| C. | 6.76 |
| D. | 11.56 |
| Answer» E. | |
| 5. |
In a self locking brake, the force required to apply the brake is |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | Average |
| Answer» B. Minimum | |
| 6. |
For the brake shown in the figure, which one of the following is TRUE? |
| A. | Self energizing for clockwise rotation of the drum |
| B. | Self energizing for anti-clockwise rotation of the drum |
| C. | Self energizing for rotation in either direction of the drum |
| D. | Not of the self energizing type |
| Answer» B. Self energizing for anti-clockwise rotation of the drum | |
| 7. |
A force of 400 N is applied to the brake drum of 0.5 m diameter in a band brake system as shown in the figure, where the wrapping angle is 180°. If the coefficient of friction between the drum and the band is 0.25, the braking torque applied, in Nm is |
| A. | 100.6 |
| B. | 54.4 |
| C. | 22.1 |
| D. | 15.7 |
| Answer» C. 22.1 | |
| 8. |
A block-brake shown below has a face width of 300 mm and a mean coefficient of friction of 0.25. For an activating force of 400 N, the braking torque in Nm is |
| A. | 30 |
| B. | 40 |
| C. | 45 |
| D. | 60 |
| Answer» D. 60 | |
| 9. |
For high speed engines, the cam follower should move wit? |
| A. | uniform velocity |
| B. | simple harmonic motion |
| C. | uniform acceleration and retardation |
| D. | cyclodial motion |
| Answer» E. | |
| 10. |
The capacity of a brake depends upon |
| A. | The unit pressure between the braking surfaces, |
| B. | The coefficient of friction between the braking surfaces, |
| C. | The peripheral velocity of the brake drum |
| D. | All of the mentioned |
| Answer» E. | |
| 11. |
The material used for the brake lining should have |
| A. | It should have low wear rate. |
| B. | It should have high heat resistance. |
| C. | It should have high heat dissipation capacity. |
| D. | All of the mentioned |
| Answer» E. | |
| 12. |
The transmission type of dynamometer is a |
| A. | prony brake dynamometer |
| B. | epicyclic-train dynamometer |
| C. | torsion dynamometer |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 13. |
Which of the following is an absorption type dynamometer ? |
| A. | prony brake dynamometer |
| B. | epicyclic-train dynamometer |
| C. | torsion dynamometer |
| D. | none of the mentioned |
| Answer» B. epicyclic-train dynamometer | |
| 14. |
When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be |
| A. | maximum |
| B. | minimum |
| C. | equal |
| D. | none of the mentioned |
| Answer» C. equal | |
| 15. |
The brake commonly used in motor cars is |
| A. | shoe brake |
| B. | band brake |
| C. | band and block brake |
| D. | internal expanding brake |
| Answer» E. | |
| 16. |
The brakes commonly used in railway trains is |
| A. | shoe brake |
| B. | band brake |
| C. | band and block brake |
| D. | internal expanding brake |
| Answer» B. band brake | |