Manufacturing And Production Technology - Study Mode
[#161] Internal gear cutting operation can be performed by
Correct Answer
(C) Shaping with pinion cutter
[#162] In plunge grinding
Correct Answer
(B) The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
[#163] In reaming process
Correct Answer
(C) High form accuracy is obtained
[#164] The addition of lead, sulphur and phosphorus to low carbon steels, help to
Correct Answer
(D) All of these
[#165] In an interchangeable assembly, shafts of size 25.000 -0.010⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.020⁺⁰∙⁰³⁰, the maximum interference (in microns) in the assembly is
Correct Answer
40
Explanation
Solution: Understanding Interchangeable Assembly: Imagine you're building something with lots of parts, like a machine. An interchangeable assembly means all the parts are made to precise sizes so they fit together perfectly, no matter which part you pick. Shafts and Holes: In this question, we have shafts (like rods) and holes. The sizes are given with tolerances (the allowed variation). Understanding the Size Notation: For example, "25.000 -0.010⁺⁰∙⁰⁴⁰ mm" for the shaft means: * 25.000 mm is the basic size. * -0.010 mm is the lower limit (the shaft can be 0.010 mm smaller than 25.000 mm). * +0.040 mm is the upper limit (the shaft can be 0.040 mm larger than 25.000 mm). Similarly, "25.000 -0.020⁺⁰∙⁰³⁰ mm" for the hole means: * 25.000 mm is the basic size. * -0.020 mm is the lower limit. * +0.030 mm is the upper limit. Finding Maximum Interference: Interference happens when the shaft is bigger than the hole. Maximum interference means finding the biggest possible difference between the largest shaft and the smallest hole. * Largest Shaft: 25.000 + 0.040 = 25.040 mm * Smallest Hole: 25.000 - 0.020 = 24.980 mm * Maximum Interference: 25.040 - 24.980 = 0.060 mm Converting to Microns: 1 mm = 1000 microns Therefore, 0.060 mm = 0.060 * 1000 = 60 microns Therefore, the correct answer is E: 60