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Consider the following statements: 
1. From design considerations, it is always advantageous to place cast iron ribs on thetension side rather than on the compression side.
2. Cast iron is an excellent choice for machine tool guides and frames.
3. Cast iron parts have low notch sensitivity.
Which of these statements are correct?
  • a)
    1, 2 and 3
  • b)
    2 and 3
  • c)
    1 and 3
  • d)
    1 and 2
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following statements:1. From design considerations, it is...
Ans. (b)
Since cast iron is strong in compression and weak in tension. Therefore,
statement 1 is wrong.
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Most Upvoted Answer
Consider the following statements:1. From design considerations, it is...
Explanation:
1. Placing cast iron ribs on tension side:
- Cast iron is brittle and has low tensile strength, so it is advantageous to place it on the tension side where it can resist the tensile stress.
- On the compression side, it can crack and fail under the compressive stress.
- So statement 1 is correct.

2. Cast iron for machine tool guides and frames:
- Cast iron has good damping properties and is resistant to wear and tear, making it a good choice for machine tool guides and frames.
- It also has high compressive strength, which makes it suitable for withstanding the heavy loads and stresses involved in machining operations.
- So statement 2 is correct.

3. Cast iron parts have low notch sensitivity:
- Notch sensitivity refers to the tendency of a material to fail at points of stress concentration like cracks, notches or grooves.
- Cast iron has low notch sensitivity because of its high compressive strength, low ductility and high resistance to fatigue crack propagation.
- So statement 3 is correct.

Therefore, the correct answer is option B (2 and 3).
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Consider the following statements:1. From design considerations, it is always advantageous to place cast iron ribs on thetension side rather than on the compression side.2. Cast iron is an excellent choice for machine tool guides and frames.3. Cast iron parts have low notch sensitivity.Which of these statements are correct?a)1, 2 and 3b)2 and 3c)1 and 3d)1 and 2Correct answer is option 'B'. Can you explain this answer?
Question Description
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