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Two advantages of using helical gears rather than spur gears in a transmission system are
The advantages of using helical gears rather than spur gears in a transmission system are . . . . . . . .
Consider the following statements: 1. In spur gears, the contact occurs abruptly on a line parallel to the axis, and the disengagement too is abrupt. 2. In helical gears, both loading and unloading are gradual, and therefore, these happen more smoothly and less noisily 3. When two gears mesh, any arbitrary shape of the tooth can be chosen for the profile of the teeth of any one of the two gears, and the profile for the other shall be obtained by applying the law of gearing. Which of the above statements are correct?
Why are the helical gears used commonly in transmission over spur gears?
Consider the following statements: In case of helical gears, teeth are cut at an angle to the axis of rotation of the gears. 1) Helix angle introduces another ratio called axial contact ratio. 2) Transverse contact ratio is equal to axial contact ratio in helical gears. 3) Large transverse contact ratio does not allow multiple teeth to share the load. 4) Large axial contact ratio will cause larger axial force component Which of the above statements are correct?
A pair of helical gears has fewer teeth in contact as compared to an equivalent pair of spur gears.
Consider the following advantages with respect of HVDC transmission: 1. Long distance transmission 2. Low cost of transmission 3. Higher efficiency Which of the above advantages are correct?
Helical gears mounted on parallel shafts are called crossed helical gears.
Some of the physical and functional advantages of optical fiber communication are mentioned here. Select the option which tells about the functional advantages of optical fiber communication. I. The transmission bandwidth of the fiber optic cables is higher than the metal cables. II. Since these cables are di-electric, no spark hazards are present. III. Fibre optic cables last longer than copper cables. IV. The amount of data transmission is higher in fiber optic cables. V. Fibre optic cables are immune to electromagnetic interference. VI. These are not affected by electrical noise.
Among the following types of gears, which gears offer a refinement over spur gears?