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Manufacturing And Production Technology MCQ Questions & Answers | Mechanical Engineering

Learn Manufacturing And Production Technology MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Manufacturing And Production Technology MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-4 section-4

Each section contains 100 MCQs on Manufacturing and Production Technology .
31
Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles ‘on’ and 2 cycles ‘off’ Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
32
Internal gears can be made by
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Answer & Solution
Answer: Option B
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33
What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?
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Answer & Solution
Answer: Option A
Solution:
Option A: Porosity
Cause: Entrapment of gases due to contaminants such as oil, rust, moisture, grease, or inadequate shielding
Appearance: Small holes/voids within or on the surface of the weld bead
Link to question: A dirty joint directly promotes gas formation and entrapment, and poor manipulation of the weld rod can disturb shielding and puddle control, increasing porosity risk

Option B: Undercut
Cause: Improper rod angle, excessive current/arc length, high travel speed, poor manipulation
Appearance: A groove along the base metal at the weld toe that remains unfilled
Link to question: Strongly tied to poor manipulation, but not typically caused by a dirty joint; contamination is not a primary driver of undercut

Option C: Under fill
Cause: Insufficient filler deposition due to low current or improper travel technique
Appearance: Weld surface below the adjacent base metal level
Link to question: Not chiefly related to dirty joints; more about inadequate filler or heat input

Option D: Crack
Cause: High residual stresses, rapid cooling, hydrogen embrittlement, poor preheat/postheat control
Appearance: Fracture in weld metal or HAZ
Link to question: Not primarily linked to contamination or simple rod manipulation errors

Conclusion: The only defect that matches both stated causes—poor manipulation of the weld rod or a dirty joint—is Porosity (Option A).
34
The broaching operation in which the work moves past the stationary tool is called
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Answer & Solution
Answer: Option D
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35
The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.
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Answer & Solution
Answer: Option A
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36
Trepanning is an operation of
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Answer & Solution
Answer: Option D
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37
Lapping is an operation of
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Answer & Solution
Answer: Option C
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38
The saw milling is an operation of
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Answer & Solution
Answer: Option B
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39
The chamfering is an operation of
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Answer & Solution
Answer: Option A
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40
The grooving is an operation of
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Answer & Solution
Answer: Option C
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