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Question

If a flat chisel is used instead of a center punch before drilling, what problem might occur?

This question was previously asked in
RRB ALP 2025 CBT 2 Heat Engine Question Paper (28-Jul-2026) (Shift 2)
The correct answer is

Drill bit may slip off the spot

In the given question, we need to identify the problem that might occur if a flat chisel is used instead of a center punch before drilling. Let's break down the steps and explanation:

Understanding the Tools:

  • Center Punch: Typically used to create a small indentation on the surface of the material. This indentation ensures that the drill bit has a guide and starts at an exact point without slipping.
  • Flat Chisel: Generally used for cutting or shaping material, not for creating a precise starting point for drilling.

Analyzing the Options:

  1. Drill will make a larger hole: Using a flat chisel doesn't directly affect the size of the hole as it pertains to the guide point, not the width of the drill's cutting path.
  2. Drill bit may slip off the spot: A flat chisel does not create an indentation to guide the drill bit. Without a proper guide, the drill bit may easily slip off the intended starting point.
  3. Drill will cut faster: The speed of cutting is more related to the drill bit, material, and drill speed, not the indentation method.
  4. Workpiece will become softer: The hardness of the workpiece is independent of the use of a flat chisel or center punch. It is determined by the material's properties.

Conclusion:

The most likely issue when using a flat chisel instead of a center punch is that the drill bit may slip off the spot. This is because a flat chisel doesn't provide the necessary indentation to guide the drill bit precisely at the starting point.

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Similar Questions

  1. A fitter is tasked with marking accurate parallel lines on a metal plate before cutting. He must select a divider with tips made of a suitable material for this job. Which divider tip material would be most appropriate to use to avoid rapid wear and ensure precise marking on the metal surface?

  2. In a workshop, a mechanic needs to determine the length of the diagonal support for a rectangular metal plate with sides of 9 cm and 12 cm. Which value represents the correct length of the diagonal support needed?

  3. Why is centre punching necessary on curved or cylindrical surfaces?

  4. Which operation most benefits from using a V-block with a clamp?

  5. In marking operations, a V-block is mainly used to:

  6. Why are V-blocks often used in pairs when supporting long cylindrical workpieces?

  7. Which tool is most appropriate for marking parts before removing them during diesel engine dismantling to ensure correct reassembly?

  8. Which of the following is a correct use of a centre punch during layout work?

  9. A student marks a line with a scriber, but the line is barely visible. What might be the most likely cause?

  10. Which feature distinguishes a centre punch from a prick punch in terms of construction?


Important Questions from Marking and Marking Tools

  1. What is the point angle of prick punch which is used for making light punch marks?

  2. The point angle of scriber is

  3. The angle of the punch used for witness marks is

  4. A fitter is tasked with marking accurate parallel lines on a metal plate before cutting. He must select a divider with tips made of a suitable material for this job. Which divider tip material would be most appropriate to use to avoid rapid wear and ensure precise marking on the metal surface?

  5. In a workshop, a mechanic needs to determine the length of the diagonal support for a rectangular metal plate with sides of 9 cm and 12 cm. Which value represents the correct length of the diagonal support needed?

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