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Motors ch 16
Drive Systems and Clutches
| Question | Answer |
|---|---|
| 1. A __- gear is a gear with teeth that are not parallel to the shaft axis | helical |
| Know the different gears | Helical Rack-and pinion Spur Worm |
| 2. A ___ gear is a gear with staright tapered teeth used in apllications where shaft axes intersect | bevel |
| 3. A ___ clutch generally can control the torque over only a limited operating range but is well suited for hoists and cranes | friction |
| 4. An elevator application has a nominal torque rating of 120 lb-in and a application service factor of 2.25. The coupling torque rating is ___ lb-in. | 270.0 TCR = TNR * SF |
| 5. An ___ clutch uses a magnetic field to couple a motor to a load. | eddy-current |
| 6. ___ gears, which are mounted on parael shafts, are the most common gears used in industry. | Spur |
| 7. A used, undamaged V-belt can be used to replace any damaged V-belt in a set in order to save money. True or False | False |
| 8. A ___ v-belt has a smaller cross section and a higher profile than other types to allow the belt to transmit large amounts of power with the small cross section. | narrow |
| 9. A ___ containing gear teeth is used for synchronous drive systems. | timing belt |
| 10. A __ sprocket has a integrated hub on both sides of the sprocket. | C |
| 11. A ___ is grooved wheel used to hold a V-belt | sheave |
| 12. Pulleys should be placed a distance apart equal to at least ___ times the diameter of the largest pulley. | 3 |
| 13. The operating speed of a motor is 2,100 rpm, the motor sheave diameter is 6", and the load sheave diameter is 4". The speed of the load is ___ rpm. | 3,150 Sm/SL = DL/DM SL = SM * DM / DL |
| 14. A motor operating at a speed of 1,740 rpm is fitted with a sheave 5" in diameter. The load sheave has a diameter of 6". The belt speed is ___ fpm. | 2,278 SB = SM * ( pi * D/12) |
| 15. A ___ spocket has an integrated hub on one side of the sprocket. | B |
| 16. The gear ratio of 6" drive gear and a 2" driven gear is ____:1. | 3 |
| 17. Proper belt and pulley combinations can be determined by tables provided by manufacturers rather than by calculating the appropriate range of belt sizes for a specific pulley. True or False | True |
| 18. A ___ is used to protect gears from the surrounding environment and to change shaft rotation, speed, and/or direction of rotation. | gearbox |
| 19. A ___ is coupling that connects or disconnects the motor shaft to a drive shaft while the motor is running. | clutch |
| 20. When a belt overheats because the tension is too high, the result is rapid wear and increased load on the motor and bearings. True or False | True |
| 21 A 4 HP motor operates at 1,745 rpm. The nominal torque rating is ___ lib-in. | 145 Ti= P * 63025 / S 4 * 63025 / 1745 |
| 22. The input speed of an eddy-current clutch is more than the output speed because slip is required. True or False | True |
| 23. The operating speed of a motor is 1,740 rpm and the desired speed of the load is 2,175 rpm. The motor sheave diameter is 5" in diameter. The required diameter of the load sheave is ___. | 4.0 SM/SL = DL/DM 1740 * 5 / 2175 |
| 24. ___ transmit torque to and from a pulley through the wedging action of the tapered sides of the belt in the pulley groove. | V-belts |
| 25. Identify types of gears from page 79 | Spur, Herical, Rack and Pinion, ? , Bevel, worm |
Created by:
JoshHampton