Manufacturing And Production Technology MCQ Questions & Answers | Mechanical Engineering

Taper Turning can be done in Lathe by tailstock setover method, in which the tailstock is moved from its middle position to one side of the bed, making the work-piece tilted wrt the lathe axis and feed. Thus, when the tool moves, it cut the workpiece at an angle to its axis, creating a taper. The tail stock set over method of taper turning is preferred for Long slender tapers

The correct option is "Globular transfer".

In the metal arc welding process, globular transfer refers to the mode of metal transfer where molten metal crosses the arc in the form of comparatively large drops.

The frequency of transfer is relatively low, usually 100 drops per second or less. These large drops are often bigger than the electrode diameter and fall across the arc due to gravity.

Globular transfer is generally associated with high welding currents and is less stable compared to spray transfer, producing more spatter and less smooth welds.

Why not the others?

"Spray transfer" involves a fine spray of very small droplets at a much higher rate than 100 drops/sec, resulting in smooth welds with minimal spatter.

"GMAW practice" (Gas Metal Arc Welding) is the overall welding process, not a specific mode of metal transfer.

"Dip transfer" (short-circuiting transfer) occurs when the electrode tip touches the molten pool, and metal transfer happens in small droplets during short-circuits, not in large drops.

Therefore, the correct answer is Globular transfer.

Friction welding (FRW) is a solid-state welding process that generates heat through mechanical friction between workpieces in relative motion to one another, with the addition of a lateral force called "upset" to plastically displace and fuse the materials

A lathe center, often shortened to center, is a tool that has been ground to a point to accurately position a workpiece on an axis. They usually have an included angle of 60°, but in heavy machining situations an angle of 75° is used.

A machine taper is a system for securing cutting tools or toolholders in the spindle of a machine tool or power tool. A male member of conical form (that is, with a taper) fits into the female socket, which has a matching taper of equal angle The taper on the lathe spindle is 1 in 20

In Down milling operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.