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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?
Consider the following modifications regarding avoiding the interference between gears: 1. The centre distance between meshing gears be increased 2. Addendum of the gear be modified 3. Teeth should be undercut slightly at the root 4. Pressure angle should be increased 5. Circular pitch be increased Which of these are effective in avoiding interference?
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?
Among the following types of gears, which gears offer a refinement over spur gears?
Interference in a pair of gears is avoided, if the addendum circles of both the gears intersect common tangent to the base circles within the points of tangency.
Statement (I): Two  non-intersecting and non-parallel, i.e., non-coplanar, shafts connected by gears are called skew-bevel gears or spiral gears, and this type of gearing has a line contact the rotation of which about the axes generates the two hyperboloid pitch surfaces. Statement (II): A hyperboloid is a 3D surface formed by revolving a straight line about an axis (not in the same plane), such that every point on the line remains at a constant distance from the axis.
Which of the following statements is/are correct? 1. The earth is nearest to the Sun at Perihelion, which generally occurs on January 3. 2. The earth is farthest away from the Sun at Perihelion, which generally occurs on July 4. 3. The earth is farthest away from the Sun at Aphelion, which generally occurs on July 4. 4. The earth is nearest to the Sun at Aphelion, which generally occurs on January 3. Select the correct answer using the code given below:
Consider the following statements: When a thick plate is subjected to external loads: 1. State of plane stress occurs at the surface 2. State of plane strain occurs at the surface 3. State of plane stress occurs in the interior part of the plate 4. State of plane strain occurs in the interior part of the plate Which of these statements are correct?
Which among the following institution introduced interference temperature as a metric for interference?
The problem of interference in involute profile gears can be overcome by which one of the following means?