MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the shaft angle for same hand of helix if helix angle of two gears are 20⁰ and 17⁰. |
| A. | 17⁰ |
| B. | 20⁰ |
| C. | 37⁰ |
| D. | 3⁰ |
| Answer» D. 3⁰ | |
| 2. |
A herringbone speed reducer consist of 20 teeth pinion driving a 100 teeth gear. The normal module of gear is 2mm. The face width of each half is 30mm and Lewis factor is 0.4. Calculate the ratio factor Q. |
| A. | 1.2 |
| B. | 1.4 |
| C. | 1.7 |
| D. | 1.4 |
| Answer» D. 1.4 | |
| 3. |
A herringbone speed reducer consist of 20 teeth pinion driving a 100 teeth gear. The normal module of gear is 2mm. The face width of each half is 30mm and Lewis factor is 0.4. If permissible bending stress is 500N/mm², then calculate the beam strength. |
| A. | 15000N |
| B. | 12000N |
| C. | 8000N |
| D. | 10000N |
| Answer» C. 8000N | |
| 4. |
Helix angle of herringbone and double helical gears is relatively higher. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
The net axial force acting on bearing is zero in case of double helical gears while none zero in case of herringbone gears. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which of the following is herringbone gear? |
| A. | Left one |
| B. | Right one |
| C. | Both |
| D. | None |
| Answer» B. Right one | |
| 7. |
A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the tangential force If surface hardness is 260BHN. Also face width=35mm, module=4mm and helix angle=25⁰. The velocity of operation is 3.5m/s and service factor 1.5. |
| A. | 1136.5N |
| B. | 3983.7 |
| C. | 2012.6N |
| D. | 3226.5N |
| Answer» C. 2012.6N | |
| 8. |
A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the wear strength If surface hardness is 260BHN. Also face width=35mm, module=4mm and helix angle=25⁰. |
| A. | 443.5N |
| B. | 1125.6N |
| C. | 7971.9N |
| D. | 1014.2N |
| Answer» D. 1014.2N | |
| 9. |
HELIX_ANGLE_OF_HERRINGBONE_AND_DOUBLE_HELICAL_GEARS_IS_RELATIVELY_HIGHER.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
A_herringbone_speed_reducer_consist_of_20_teeth_pinion_driving_a_100_teeth_gear._The_normal_module_of_gear_is_2mm._The_face_width_of_each_half_is_30mm_and_Lewis_factor_is_0.4._If_permissible_bending_stress_is_500N/mm²,_then_calculate_the_beam_strength.$# |
| A. | 15000N |
| B. | 12000N |
| C. | 8000N |
| D. | 10000N |
| Answer» C. 8000N | |
| 11. |
Calculate the shaft angle for same hand of helix if helix angle of two gears are 20‚Äö√Ö‚àû and 17‚Äö√Ö‚àû.$ |
| A. | 17‚Äö√Ö‚àû |
| B. | 20‚Äö√Ö‚àû |
| C. | 37‚Äö√Ö‚àû |
| D. | 3‚Äö√Ö‚àû |
| Answer» D. 3‚Äö√Ñ√∂‚àö√ñ‚Äö√†√ª | |
| 12. |
Crossed helical gears have very low load carrying capacity. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Helical gears mounted on parallel shafts are called crossed helical gears. |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
A herringbone speed reducer consist of 20 teeth pinion driving a 100 teeth gear. The normal module of gear is 2mm. The face width of each half is 30mm and Lewis factor is 0.4. Calculate the material constant K if surface hardness is 400BHN. |
| A. | 1.25 N/mm² |
| B. | 4.05 N/mm² |
| C. | 3.25N/mm² |
| D. | 2.56N/mm |
| Answer» D. 2.56N/mm | |
| 15. |
The net axial force acting on bearing is zero in case of double helical gears while none zero in case of herringbone gears? |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the tangential force If surface hardness is 260BHN. Also face width=35mm, module=4mm and helix angle=25‚Äö√Ö‚àû. The velocity of operation is 3.5m/s and service factor 1.5.$ |
| A. | 1136.5N |
| B. | 3983.7 |
| C. | 2012.6N |
| D. | 3226.5N |
| Answer» C. 2012.6N | |
| 17. |
A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the wear strength If surface hardness is 260BHN. Also face width=35mm, module=4mm and helix angle=25‚Äö√Ö‚àû.$ |
| A. | 443.5N |
| B. | 1125.6N |
| C. | 7971.9N |
| D. | 1014.2N |
| Answer» D. 1014.2N | |
| 18. |
A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the material constant k If surface hardness is 260BHN. |
| A. | 0.64N/mm² |
| B. | 0.88N/mm² |
| C. | 1.08N/mm² |
| D. | 2.66N/mm² |
| Answer» D. 2.66N/mm¬¨¬®‚Äö√¢¬ß | |
| 19. |
A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the ratio factor. |
| A. | 0.74 |
| B. | 0.88 |
| C. | 1.57 |
| D. | 1.44 |
| Answer» D. 1.44 | |
| 20. |
Beam strength indicates the maximum value of radial force that a tooth can transmit without fatigue failure. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
Lewis form factor is based on real number of teeth. |
| A. | True |
| B. | False |
| Answer» C. | |