Manufacturing And Production Technology - Study Mode

[#221] A type of welding flows, which is the result of a perfect proportion and mixture of acetylene and oxygen and is used for fusion welding of steel and cast iron, is
Correct Answer

(D) Neutral flame

Explanation

Solution: Neutral flame is type of welding flows, which is the result of a perfect proportion and mixture of acetylene and oxygen and is used for fusion welding of steel and cast iron.

The neutral flame is the flame in which the amount of oxygen is precisely enough for burning, and neither oxidation nor reduction occurs.
A flame with a good balance of oxygen is clear blue.
The reducing and neutral flames are useful in soldering and annealing.
Neutral flame has a 1:1 ratio of acetylene and oxygen. It's the most preferred flame for welding.

[#222] The lathe spindles are usually made hollow and provided with
Correct Answer

(A) Internal taper

Explanation

Solution: The lathe spindles are usually made hollow and provided with Internal taper: - Lathe spindles are used for machine-cutting of workpieces - It can also be referred to as workpiece spindles - As the workpiece is clamped via the chuck of the lathe spindle

[#223] A shaft has a dimension, φ9 +0.025⁺⁰∙⁰⁰⁹, the respective values of fundamental deviation and tolerance are
Correct Answer

(D) −0.009, 0.016

[#224] In transverse grinding
Correct Answer

(A) The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face

Explanation

Solution: Transverse Cylindrical Grinding. Considering plunge grinding, in which the wheel and the workpiece motions act on the same plane.
-transverse grinding involves the addition of crossfeed (transverse motion) of the workpiece relative to the grinding wheel in a direction perpendicular to the plane of wheel rotation.

[#225] A single point thread cutting tool should ideally have
Correct Answer

(B) Positive rake angle

Explanation

Solution: A single point thread cutting tool should ideally have a positive rake angle. Positive rake angle helps in reducing the cutting forces and improving the cutting action, which is particularly beneficial in thread cutting to produce clean and precise threads. A positive rake angle facilitates better chip flow and reduces the power consumption during cutting. While zero or negative rake angles can be used in specific situations, a positive rake angle is generally preferred for efficient and effective thread cutting.