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Questions and Answers
What is the primary purpose of a mechanism?
What is the primary purpose of a mechanism?
- To restrict contact between moving and fixed body surfaces
- To create an ideal joint
- To generate rotational motion
- To change the direction, type, speed, or amount of force or torque available (correct)
According to Grashof's law, what is the relationship between the lengths of the four links in a four-bar chain?
According to Grashof's law, what is the relationship between the lengths of the four links in a four-bar chain?
- The lengths of all four links must be equal
- There is no relationship between the link lengths
- The sum of the shortest and longest link lengths must be greater than the sum of the other two links (correct)
- The lengths of the links must form a geometric progression
Which type of kinematic chain has three turning pairs and one sliding pair?
Which type of kinematic chain has three turning pairs and one sliding pair?
- Four-bar chain
- Single slider-crank chain (correct)
- Double slider-crank chain
- All of the above
What is the primary function of the slider-crank mechanism?
What is the primary function of the slider-crank mechanism?
Which type of kinematic chain has two sliding pairs and two rotating pairs?
Which type of kinematic chain has two sliding pairs and two rotating pairs?
What is the other name for the four-bar kinematic chain?
What is the other name for the four-bar kinematic chain?
What is the primary purpose of a kinematic chain in robotics?
What is the primary purpose of a kinematic chain in robotics?
What is the relationship between the links and joints in a kinematic chain?
What is the relationship between the links and joints in a kinematic chain?
Which of the following is a key characteristic of a kinematic chain?
Which of the following is a key characteristic of a kinematic chain?
What is the purpose of the kinematic equations used to describe a kinematic chain?
What is the purpose of the kinematic equations used to describe a kinematic chain?
What is the relationship between a kinematic chain and a mechanism?
What is the relationship between a kinematic chain and a mechanism?
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Study Notes
Mechanism
- A machine component that consists of two or more elements arranged to compel the motion of one element, leading to the motion of others.
- Changes the direction of movement, type of movement, speed of movement, and amount of torque or force available to do work.
Kinematic Chains
- A series of interconnected bodies that can move relative to each other.
- Each link in a kinematic chain is connected to the next link by a joint, allowing for relative movement between the two links.
- Essential for the GATE ME syllabus.
Types of Kinematic Chains
- Four Bar Chain (also known as the Quadric Cycle chain)
- Single Slider Crank Chain
- Double Slider Crank Chain
Four Bar Chain
- Consists of four links, each making one turning pair.
- Links can have varying lengths.
- Grashof's law: the sum of the shortest and longest link lengths should be greater than the sum of the other two links.
Single Slider Crank Chain
- Redesigned Four Bar mechanism.
- Has three turning pairs and one sliding pair.
- Used in all reciprocating engines.
- Converts reciprocating motion into rotary motion and vice versa.
Double Slider Crank Chain
- Has two sliding and two rotating pairs.
- Consists of four elements: two sliding elements, one lever, and one slotted base.
- Used in various applications, including manufacturing, material handling, and prosthetics.
Mechanism Inversion
- Obtaining more mechanisms by fixing different Kinematic links in the Kinematic chain.
- When we fix a Kinematic link in the chain, we create a mechanism.
Kinematic Chain Definition
- A collection of links joined together by joints that allow relative motion between them.
- Important for the GATE exam as MSQ questions may be formulated using this definition.
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