1. What is gear train? Why gear trains are used?
A gear train is two or more gear working together by meshing their teeth and turning each other in a system to generate power and speed.
It reduces speed and increases torque
2. Why intermediate gear in simple gear train is called idler?
These intermediate gears are called idle gears, as they do not effect the speed ratio or train value of the system.
3. What are the types of gears available?
According to the position of axes of the shafts
Parallel
1. Spur Gear
2. Helical Gear
3. Rack and Pinion
Intersecting
Bevel Gear
Non-intersecting and Non-parallel
Worm and worm gears
4. What do you mean by Elastic deformation?
Deformation of the material that is recovered instantaneously when the applied load is removed.
5. How does a boring operation differ from a turning operation?
Boring produces an internal cylindrical shape from an existing hole, while turning produces an external cylindrical shape.
6. Describe the difference between up milling and down milling?
In up milling, the cutter speed direction is opposite the feed direction; in down milling, the direction of cutter rotation is the same as the feed direction.
7. What is non-compressible fluid?
If the change in density of a fluid is small due to changes in temperature and or pressure, then the fluid is called incompressible fluid.
8. What is cam?
A cam is a rotating machine element which gives reciprocating or oscillating motion to another element known as follower.
9. Describe the turning process.
Turning is a machining process in which a single point tool removes material from the surface of a rotating cylindrical work piece, the tool being fed in a direction parallel to the axis of work rotation.
10. What are the practical examples of trusses in use?
Examples of trusses are:
1. The trusses are used to support roofs.
2. Trusses are used to make bridges.
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