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Consider the following statements:
1. Lower pairs are more resistant than the higher pairs in a plane mechanism.
2. In a 4-bar mechanism (with 4 turning pairs), when the link opposite to the shortest link is fixed, a double rocker mechanism results.
2. In a 4-bar mechanism (with 4 turning pairs), when the link opposite to the shortest link is fixed, a double rocker mechanism results.
Which of the statements given above is/are correct?
[IES-2006]
- a)Only 1
- b)Only 2
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements: 1. Lower pairs are more resistant t...
To determine the correct answer, let's analyze each statement individually:
1. Lower pairs are more resistant than the higher pairs in a plane mechanism.
- In a plane mechanism, there are two types of pairs: lower pairs and higher pairs. Lower pairs have surface contact between the elements, such as a revolute pair or a prismatic pair. Higher pairs have line or point contact, such as a screw pair or a rolling pair.
- In general, lower pairs are more resistant to wear and tear compared to higher pairs. This is because the surface contact provides better load distribution and reduces localized stresses. Additionally, lower pairs usually have larger contact areas, which further improves their resistance.
- Therefore, statement 1 is correct.
2. In a 4-bar mechanism (with 4 turning pairs), when the link opposite to the shortest link is fixed, a double rocker mechanism results.
- A 4-bar mechanism consists of four links connected by four turning pairs, which allow relative motion between the links.
- When one link in the mechanism is fixed, the remaining links can move relative to each other, resulting in different configurations.
- In the given scenario, if the link opposite to the shortest link is fixed, it means that the shortest link cannot move. This configuration leads to a mechanism where the two remaining links can rotate freely, resembling a double rocker.
- Therefore, statement 2 is correct.
Based on the analysis of both statements, we can conclude that both statement 1 and statement 2 are correct.
Therefore, the correct answer is option 'C' - Both 1 and 2.
1. Lower pairs are more resistant than the higher pairs in a plane mechanism.
- In a plane mechanism, there are two types of pairs: lower pairs and higher pairs. Lower pairs have surface contact between the elements, such as a revolute pair or a prismatic pair. Higher pairs have line or point contact, such as a screw pair or a rolling pair.
- In general, lower pairs are more resistant to wear and tear compared to higher pairs. This is because the surface contact provides better load distribution and reduces localized stresses. Additionally, lower pairs usually have larger contact areas, which further improves their resistance.
- Therefore, statement 1 is correct.
2. In a 4-bar mechanism (with 4 turning pairs), when the link opposite to the shortest link is fixed, a double rocker mechanism results.
- A 4-bar mechanism consists of four links connected by four turning pairs, which allow relative motion between the links.
- When one link in the mechanism is fixed, the remaining links can move relative to each other, resulting in different configurations.
- In the given scenario, if the link opposite to the shortest link is fixed, it means that the shortest link cannot move. This configuration leads to a mechanism where the two remaining links can rotate freely, resembling a double rocker.
- Therefore, statement 2 is correct.
Based on the analysis of both statements, we can conclude that both statement 1 and statement 2 are correct.
Therefore, the correct answer is option 'C' - Both 1 and 2.
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Consider the following statements: 1. Lower pairs are more resistant than the higher pairs in a plane mechanism.2. In a 4-bar mechanism (with 4 turning pairs), when the link opposite to the shortest link is fixed, a double rocker mechanism results.Which of the statements given above is/are correct?[IES-2006]a)Only 1b)Only 2c)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'C'. Can you explain this answer?
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