SIMPLE MECHANISM

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• Q1: Define Machine.
  Ans: A machine is a device or combination of mechanisms that transmits and transforms energy to perform useful work.
• Q2: Write the advantages of machines.
  Ans: The advantages of machines are:

  • ➔ It reduces human effort
  • ➔ It increases efficiency and speed of work
  • ➔ It saves time
  • ➔ It improves accuracy of work
  • ➔ It helps in performing heavy tasks easily
• Q3: Define Kinematics.
  Ans: Kinematics is the branch of mechanics which deals with the motion of bodies without considering the forces causing the motion.
• Q4: Define Dynamics.
  Ans: Dynamics is the branch of mechanics which deals with the motion of bodies and the forces causing that motion.
• Q5: State the Theory of Machines
  Ans: Theory of Machines is the study of relative motion between different parts of a machine and the forces acting on them.
• Q6: Define Kinematic Link.
  Ans: A kinematic link is a resistant body or a group of bodies which connects other parts of a machine and allows relative motion.
• Q7: Define Kinematic Pair.
  Ans: A kinematic pair is a connection of two links that permits a definite relative motion between them.
• Q8: State the types of Kinematic Pairs.
  Ans: The types of kinematic pairs are:

  • ➔ Sliding Pair
  • ➔ Turning Pair
  • ➔ Rolling Pair
  • ➔ Screw Pair
• Q9: Define Sliding Pair.
  Ans: A sliding pair is a kinematic pair in which one link slides over another.
• Q10: Define Rolling Pair.
  Ans: The kinematic pair in which elements of the pair have rolling contact with each other is known as Rolling Pair.
• Q11: Define Turning Pair.
  Ans: A turning pair is a kinematic pair in which one link rotates about a fixed axis relative to another link.
• Q12: Define Screw Pair.
  Ans: A screw pair is a kinematic pair in which one link has screw motion (rotation + translation) relative to another.
• Q13: Define Lower Pair.
  Ans: A lower pair is a kinematic pair in which two links have surface contact.
• Q14: Define Higher Pair.
  Ans: A higher pair is a kinematic pair in which two links have point or line contact.
• Q15: State some examples of Kinematic Pairs.
  Ans: Examples of kinematic pairs are:

  • ➔ Piston and cylinder
  • ➔ Nut and bolt
  • ➔ Shaft and bearing
  • ➔ Cam and follower
• Q16: Define Kinematic Chain.
  Ans: A kinematic chain is a combination of links connected in such a way that their relative motion is constrained.
• Q17: State the types of Kinematic Chain.
  Ans: The types of kinematic chain are:

  • ➔ Simple chain
  • ➔ Compound chain
  • ➔ Complex chain
• Q18: Briefly explain Kinematic Chain with Three Lower Pairs.
  Ans: A kinematic chain with three lower pairs is a simple closed chain of three links connected by three lower pairs, forming a triangle-like structure with constrained motion.
• Q19: Briefly explain Kinematic Chain with Four Lower Pairs.
  Ans: A kinematic chain with four lower pairs consists of four links connected in a closed loop using four lower pairs, commonly used in mechanisms like four-bar linkages.
• Q20: Briefly explain Un-constrained Chain.
  Ans: An unconstrained chain is a kinematic chain in which relative motion between links is not restricted and free movement is possible.
• Q21: Briefly explain Six Link Chain.
  Ans: A six link chain is a kinematic chain consisting of six links connected in a closed or open loop, used in complex mechanisms.
• Q22: Briefly explain Quadric cycle Chain.
  Ans: A quadric cycle chain is a four-link kinematic chain used to produce rotary motion from oscillatory motion or vice versa.
• Q23: Briefly explain Single Slider Crank Chain.
  Ans: A single slider crank chain is a kinematic chain having one sliding pair and three turning pairs, used in engines to convert reciprocating motion into rotary motion.
• Q24: Briefly explain Double Slider Crank Chain.
  Ans: A double slider crank chain is a kinematic chain having two sliding pairs and two turning pairs, used in mechanisms like elliptical trammels.
• Q25: Define Mechanism.
  Ans: A mechanism is a kinematic chain in which one link is fixed and the others move relative to it to produce a desired motion.
• Q26: State the types of Mechanism.
  Ans: The types of mechanism are:

  • ➔ Simple mechanism
  • ➔ Compound mechanism
• Q27: Define Simple Mechanism.
  Ans: A simple mechanism is a mechanism formed by a single kinematic chain with one fixed link.
• Q28: Define Compound Mechanism.
  Ans: A compound mechanism is formed by combining two or more simple kinematic chains.
• Q29: What are Elliptical Trammels?
  Ans: Elliptical trammels is a double slider crank mechanism used to draw an ellipse by sliding two perpendicular sliders.