# THEORY OF MACHINES INTERVIEW QUESTIONS AND ANSWERS

## Q: What is a machine?

A: A machine is a device that is designed to convert one form of energy into another or to transmit, modify, or apply force.

## Q: What is a kinematic chain?

A kinematic chain is a sequence of links connected by joints in such a way that the motion of one link affects the motion of all the other links in the chain.

## Q: What is the difference between a mechanism and a machine?

A mechanism is a combination of rigid bodies connected by links and joints, designed to transmit motion and force. A machine, on the other hand, is a mechanism that is capable of performing useful work.

## Q: What is a degree of freedom?

The degree of freedom of a mechanism refers to the number of independent parameters required to describe its motion completely.

## Q: What is a cam mechanism?

A cam mechanism is a device that converts rotary motion into linear motion or vice versa, by means of a cam and a follower.

## Q: What is meant by the term ‘inversion of a mechanism’?

The inversion of a mechanism refers to the process of obtaining a new mechanism by changing the fixed and moving parts of an existing mechanism.

## Q: What is a slider-crank mechanism?

A slider-crank mechanism is a mechanism that converts rotary motion into linear motion or vice versa, by means of a slider and a crank.

## Q: What is meant by the term ‘kinematic analysis’?

Kinematic analysis is the study of the motion of a mechanism, without considering the forces or torques that cause the motion.

## Q: What is the difference between kinematics and kinetics?

A: Kinematics deals with the motion of bodies without considering the forces that cause the motion, whereas kinetics is concerned with the forces that cause the motion.

## Q: What is the difference between velocity and acceleration?

A: Velocity is the rate of change of displacement, while acceleration is the rate of change of velocity.

## Q: What is a link in a machine?

A: A link is a rigid body that is used to transmit motion or force in a machine.

## Q: What is a cam and follower mechanism?

A: A cam and follower mechanism is a system in which a cam rotates and imparts motion to a follower, which is usually a lever or a roller.

## Q: What is a gear train?

A: A gear train is a mechanism that transmits motion and power between rotating shafts using gears.

## Q: What is the difference between spur gears and helical gears?

A: Spur gears have teeth that are straight and parallel to the axis of rotation, while helical gears have teeth that are angled or helical.

## Q: What is a planetary gear system?

A: A planetary gear system is a type of gear system in which one or more gears rotate around a central gear or sun gear.

## Q: What is a clutch?

A: A clutch is a mechanical device that is used to connect or disconnect two rotating shafts.

## Q: What is a brake?

A: A brake is a mechanical device that is used to slow down or stop the motion of a machine.

## Q: What is the difference between a rigid and flexible coupling?

A: A rigid coupling connects two shafts directly, while a flexible coupling allows for some degree of misalignment and vibration damping between the shafts.

## Q: What is a mechanism?

A: A mechanism is a combination of moving parts arranged to perform a specific function.

## Q: What is kinematics?

A: Kinematics is the study of motion without considering the forces that cause the motion.

## Q: What is kinetics?

A: Kinetics is the study of motion taking into account the forces that cause the motion.

Q: What is a degree of freedom?
A: A degree of freedom is the number of independent ways in which a mechanism can move.

## Q: What is a link?

A: A link is a rigid body that is capable of rotating or translating relative to another link.

## Q: What is a joint?

A: A joint is the connection between two links that allows them to move relative to each other.

## Q: What is a planar mechanism?

A: A planar mechanism is a mechanism that operates in a single plane of motion.

## Q: What is a spatial mechanism?

A: A spatial mechanism is a mechanism that operates in three-dimensional space.

## Q: What is a cam?

A: A cam is a mechanism that converts rotary motion into reciprocating motion.

## Q: What is a follower?

A: A follower is the part of a cam mechanism that follows the contour of the cam.

## Q: What is a gear?

A: A gear is a rotating machine part with teeth that mesh with other gears to transmit torque.

## Q: What is a rack and pinion?

A: A rack and pinion is a mechanism that converts rotary motion into linear motion.

## Q: What is a belt drive?

A: A belt drive is a mechanism that transmits power between two rotating shafts using a belt.

## Q: What is a pulley?

A: A pulley is a rotating machine part with a grooved rim that holds a belt or rope.

## Q: What is a screw?

A: A screw is a mechanism that converts rotary motion into linear motion.

## Q: What is a screw jack?

A: A screw jack is a mechanical device used to lift heavy loads.

## Q: What is a clutch?

A: A clutch is a mechanism used to engage or disengage two rotating shafts.

## Q: What is a brake?

A: A brake is a mechanism used to slow or stop a rotating shaft.

## Q: What is a flywheel?

A: A flywheel is a rotating mechanical device used to store kinetic energy.

## Q: What is a governor?

A: A governor is a mechanism used to control the speed of a machine.

## Q: What is a slider-crank mechanism?

A: A slider-crank mechanism is a mechanism that converts reciprocating motion into rotary motion.

## Q: What is a four-bar mechanism?

A: A four-bar mechanism is a planar mechanism consisting of four links connected by four joints.

## Q: What is a coupler curve?

A: A coupler curve is the path traced by a point on the coupler of a four-bar mechanism.

## Q: What is a double slider-crank mechanism?

A: A double slider-crank mechanism is a mechanism that converts reciprocating motion into reciprocating motion.

## Q: What is a Geneva mechanism?

A: A Geneva mechanism is a mechanism that provides intermittent motion by using a rotating drive wheel and a driven wheel with a pin that advances the driven wheel one step at a time.

## Q: What is a toggle mechanism?

A: A toggle mechanism is a mechanism that uses a linkage consisting of two links connected by a joint to provide a high mechanical advantage.

## Q: What is a parallel mechanism?

A: A parallel mechanism is a mechanism that has multiple independent chains of links that connect the input and output.

## Q: What is a serial mechanism?

A: A serial mechanism is a mechanism in which the output of one link is the input of the next link in a chain.

## Q: What is a Stewart platform?

A: A Stewart platform is a parallel mechanism that has six linear actuators arranged in a pyramidal configuration to control the position and orientation of a platform.

## Q: What is a kinematic chain?

A: A kinematic chain is a sequence of links and joints that connect the input and output of a mechanism.

## Q: What is a mobility?

A: Mobility is the number of degrees of freedom of a mechanism.

## Q: What is the difference between a machine and a robot?

A: A machine is a device that performs a specific task, while a robot is a machine that is capable of performing a variety of tasks through programmed instructions or artificial intelligence.

## Q: What is a Scotch yoke mechanism?

A: A Scotch yoke mechanism is a mechanism that converts rotary motion into reciprocating motion using a sliding block that is attached to a reciprocating member.

## Q: What is a mobility equation?

A: A mobility equation is an equation that relates the number of links, joints, and degrees of freedom in a mechanism.

## Q: What is a Grashof condition?

A: The Grashof condition is a mathematical rule that determines whether a four-bar mechanism can achieve continuous rotation.

## Q: What is a transmission angle?

A: The transmission angle is the angle between the line of action of the driving force and the line of action of the driven force in a mechanism.

## Q: What is a toggle mechanism?

A: A toggle mechanism is a mechanism that locks at the end of the stroke, allowing it to exert a high force.

## Q: What is a parallel mechanism?

A: A parallel mechanism is a mechanism that has multiple input and output links that move in parallel.

## Q: What is a serial mechanism?

A: A serial mechanism is a mechanism that has a single input and output link.

## Q: What is a kinematic singularity?

A: A kinematic singularity is a condition where a mechanism loses one or more degrees of freedom.

## Q: What is a workspace?

A: A workspace is the range of motion that can be achieved by the end effector of a robotic mechanism.

## Q: What is a manipulator?

A: A manipulator is a robotic mechanism that is designed to move objects or perform tasks.

## Q: What is a forward kinematics problem?

A: A forward kinematics problem is the problem of determining the position and orientation of the end effector of a manipulator given the joint angles.

## Q: What is an inverse kinematics problem?

A: An inverse kinematics problem is the problem of determining the joint angles of a manipulator given the position and orientation of the end effector.