Lakshya Education MCQs

Question: 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.
Options:
A. 2.17 rpm, 600 joules
B. 6.8 rpm, 6 joules
C. 5.03 rpm, 600 joules
D. 22 rpm, 600 joules
Answer: Option A

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More Questions on This Topic :

Question 1. What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?
  1.     Porosity
  2.     Undercut
  3.     Under fill
  4.     Crack
Answer: Option B
Question 2. Trepanning is an operation of
  1.     Making a cone-shaped enlargement of the end of a hole
  2.     Smoothing and squaring the surface around a hole
  3.     Sizing and finishing a small diameter hole
  4.     Producing a hole by removing metal along the circumference of a hollow cutting tool
Answer: Option D
Question 3. The chamfering is an operation of
  1.     Beveling the extreme end of a workpiece
  2.     Embossing a diamond shaped pattern on the surface of a workpiece
  3.     Reducing the diameter of a workpiece over a very narrow surface
  4.     Enlarging the end of a hole cylindrically
Answer: Option A
Question 4. Internal gears can be made by
  1.     Hobbing
  2.     Shaping with pinion cutter
  3.     Shaping with rack cutter
  4.     Milling
Answer: Option B
Question 5. Internal gears can be made by
  1.     Hobbing
  2.     Shaping with pinion cutter
  3.     Shaping with rack cutter
  4.     Milling
Answer: Option B
Question 6. What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?
  1.     Porosity
  2.     Undercut
  3.     Under fill
  4.     Crack
Answer: Option B

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