MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Theory Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For two gears having shaft angle 90° and friction angle 6°, find the maximum efficiency of the helical gears. |
| A. | 89.23% |
| B. | 85.64% |
| C. | 79.02% |
| D. | 81.07% |
| Answer» E. | |
| 2. |
The normal circular pitch of two helical gears in a mesh is 7 mm. If the number of teeth on the smaller gear is 22 and the gear ratio is 2, find the pitch diameters of the gears. Ψ1 = 40° and Ψ2 = 25°. |
| A. | 83.01 mm, 109.93 mm |
| B. | 63.99 mm, 108.17 mm |
| C. | 85.34 mm, 96.32 mm |
| D. | 79.12 mm, 100.13 mm |
| Answer» C. 85.34 mm, 96.32 mm | |
| 3. |
Find the normal circular pitch as well as the normal module if the larger gear has 40 teeth and the gear ratio is 4. The helix angle is 20° and the shaft angle is 50°. Assume the centre distance between the gears to be 200 mm. |
| A. | 22.12 mm, 7.04 mm |
| B. | 21.31 mm, 6.78 mm |
| C. | 20.37 mm, 6.48 mm |
| D. | 21.98 mm, 6.996 mm |
| Answer» B. 21.31 mm, 6.78 mm | |
| 4. |
Find the spiral angles of the two helical gears for maximum efficiency if the shaft angle is 100° and the friction angle is 10°. |
| A. | 55°,55° |
| B. | 50°,50° |
| C. | 55°,45° |
| D. | 65°,45° |
| Answer» D. 65°,45° | |
| 5. |
The shaft angle of two helical gears is 60°. The normal module is 6 mm. The larger gear has 50 teeth and the gear ratio is 2. The centre distance is 300 mm. Find the helix angles of the two gears. |
| A. | Ψ1 = 11.68°, Ψ2 = 48.32° |
| B. | Ψ1 = 13.02°, Ψ2 = 46.98° |
| C. | Ψ1 = 10.11°, Ψ2 = 49.89° |
| D. | Ψ1 = 12.21°, Ψ2 = 47.79° |
| Answer» E. | |
| 6. |
Find the efficiency in the above problem if the friction angle is 6°. |
| A. | 89.23 % |
| B. | 91.02 % |
| C. | 88.58 % |
| D. | 85.69 % |
| Answer» D. 85.69 % | |
| 7. |
The centre distance between two meshing gears is 250 mm and the angle between the shafts is 60°. The normal circular pitch is 10 mm and the gear ratio is 2. Ψ1 = 35°. Find the value of number of teeth on both the wheels. |
| A. | 46,92 |
| B. | 45, 90 |
| C. | 54,108 |
| D. | 62, 124 |
| Answer» B. 45, 90 | |
| 8. |
Two spiral gears have a normal module of 10 mm and the angle between the skew shaft axes is 50°. The driver has 20 teeth and the helix angle of it is 30°. If the velocity ratio is 1/3 and the driver as well as the follower are both left handed, find the centre distance between the shafts. |
| A. | 434.72 mm |
| B. | 452.83 mm |
| C. | 582.19 mm |
| D. | 523.39 mm |
| Answer» B. 452.83 mm | |
| 9. |
THE_SHAFT_ANGLE_OF_TWO_HELICAL_GEARS_IS_60¬¨ àû._THE_NORMAL_MODULE_IS_6_MM._THE_LARGER_GEAR_HAS_50_TEETH_AND_THE_GEAR_RATIO_IS_2._THE_CENTRE_DISTANCE_IS_300_MM._FIND_THE_HELIX_ANGLES_OF_THE_TWO_GEARS.?$# |
| A. | Ψ<sub>1</sub> = 11.68°, Ψ<sub>2</sub> = 48.32° |
| B. | Ψ<sub>1</sub> = 13.02°, Ψ<sub>2</sub> = 46.98° |
| C. | Ψ<sub>1</sub> = 10.11°, Ψ<sub>2</sub> = 49.89° |
| D. | Ψ<sub>1</sub> = 12.21°, Ψ<sub>2</sub> = 47.79° |
| Answer» E. | |
| 10. |
Find the normal circular pitch as well as the normal module if the larger gear has 40 teeth and the gear ratio is 4. The helix angle is 20° and the shaft angle is 50°. Assume the centre distance between the gears to be 200 mm.$# |
| A. | 22.12 mm, 7.04 mm |
| B. | 21.31 mm, 6.78 mm |
| C. | 20.37 mm, 6.48 mm |
| D. | 21.98 mm, 6.996 mm |
| Answer» B. 21.31 mm, 6.78 mm | |
| 11. |
Find the spiral angles of the two helical gears for maximum efficiency if the shaft angle is 100° and the friction angle is 10°.$# |
| A. | 55°,55° |
| B. | 50°,50° |
| C. | 55°,45° |
| D. | 65°,45° |
| Answer» D. 65¬¨¬®‚Äö√†√ª,45¬¨¬®‚Äö√†√ª | |
| 12. |
For two gears having shaft angle 90° and friction angle 6°, find the maximum efficiency of the helical gears.$ |
| A. | 89.23% |
| B. | 85.64% |
| C. | 79.02% |
| D. | 81.07% |
| Answer» E. | |
| 13. |
The normal circular pitch of two helical gears in a mesh is 7 mm. If the number of teeth on the smaller gear is 22 and the gear ratio is 2, find the pitch diameters of the gears. Ψ1 = 40° and Ψ2 = 25°.$ |
| A. | 83.01 mm, 109.93 mm |
| B. | 63.99 mm, 108.17 mm |
| C. | 85.34 mm, 96.32 mm |
| D. | 79.12 mm, 100.13 mm |
| Answer» C. 85.34 mm, 96.32 mm | |
| 14. |
Find the efficiency in the above problem if the friction angle is 6°?# |
| A. | 89.23 % |
| B. | 91.02 % |
| C. | 88.58 % |
| D. | 85.69 % |
| Answer» D. 85.69 % | |
| 15. |
Find the exact centre distance for the above problem. |
| A. | 248.992 mm |
| B. | 250.934 mm |
| C. | 251.831 mm |
| D. | 251.029 mm |
| Answer» C. 251.831 mm | |
| 16. |
The centre distance between two meshing gears is 250 mm and the angle between the shafts is 60°. The normal circular pitch is 10 mm and the gear ratio is 2. Ψ1 = 35°. Find the value of number of teeth on both the wheels.$ |
| A. | 46,92 |
| B. | 45, 90 |
| C. | 54,108 |
| D. | 62, 124 |
| Answer» B. 45, 90 | |
| 17. |
Two spiral gears have a normal module of 10 mm and the angle between the skew shaft axes is 50°. The driver has 20 teeth and the helix angle of it is 30°. If the velocity ratio is 1/3 and the driver as well as the follower are both left handed, find the centre distance between the shafts.$ |
| A. | 434.72 mm |
| B. | 452.83 mm |
| C. | 582.19 mm |
| D. | 523.39 mm |
| Answer» B. 452.83 mm | |
| 18. |
The shortest distance measured along the normal to the helix between corresponding points on the adjacent teeth is called ____________ |
| A. | gear pitch |
| B. | helical pitch |
| C. | circular pitch |
| D. | normal circular pitch |
| Answer» E. | |
| 19. |
The distance between the corresponding points on adjacent teeth measured on the pitch circle is called ______________ |
| A. | helical pitch |
| B. | normal pitch |
| C. | gear pitch |
| D. | circular pitch |
| Answer» E. | |
| 20. |
The angle at which the teeth of the gear are inclined to the axis of a gear is called as __________ |
| A. | pitch angle |
| B. | normal angle |
| C. | helix angle |
| D. | gear angle |
| Answer» D. gear angle | |