Gear trains are used to change the rotational speed between shafts. The size and arrangement of gears allow for either speed reduction or increase, which is crucial for achieving the required motion and torque in a system.
How does a slider‐crank mechanism work in an engine?
A Convert rotary to linear motion
B Increase speed
C Control fuel flow
D Convert linear to rotary motion
The slider‐crank mechanism converts the rotary motion of the crank into linear motion for the piston. This is essential in engines, where the reciprocating motion of the piston is required for compression and combustion.
What is the purpose of dynamic balancing in rotating machinery?
A Increase torque
B Increase energy efficiency
C Regulate speed
D Minimize vibrations
Dynamic balancing ensures that the rotating parts of machinery are evenly balanced, reducing vibrations. This prevents damage to components, enhances machine stability, and improves the lifespan of machinery by minimizing wear and tear.
What does torque analysis primarily help engineers determine?
A Rotational forces
B Force distribution
C Speed
D Power output
Torque analysis helps determine the rotational forces acting on the components of a machine. It is crucial for understanding how power is transferred through the system and ensuring the parts operate efficiently without exceeding their limits.
What is the role of a camshaft in an engine?
A Transfer power
B Increase engine speed
C Control valve timing
D Regulate fuel intake
The camshaft controls the opening and closing of engine valves. Its timing is essential for ensuring that the intake and exhaust gases flow at the right moments, which directly affects the engine’s efficiency and performance.
What is the primary function of belt drives?
A Transfer power
B Increase torque
C Convert motion
D Regulate speed
Belt drives are used to transfer mechanical power between two rotating shafts. They are ideal for medium‐range distances, where gears may be impractical. Belt drives are commonly used in applications like fans, conveyors, and compressors.
What is the main benefit of using chain drives over belt drives?
A Longer lifespan
B Higher efficiency
C More flexible
D No slippage
Unlike belt drives, chain drives provide a positive drive and do not slip. This ensures precise and reliable power transmission, making chain drives ideal for high‐torque applications where consistent motion is critical.
How does a gear ratio affect the performance of a system?
A Changes direction
B Only affects torque
C Affects torque and speed
D Only affects speed
The gear ratio determines how speed and torque are transferred between connected gears. A high ratio increases torque while reducing speed, while a low ratio increases speed while reducing torque, affecting overall system performance.
What does a cam profile in a cam mechanism control?
A Power consumption
B Follower movement
C Torque transfer
D Speed of rotation
The cam profile controls how the follower moves. It dictates the timing, displacement, and speed of the follower, allowing for precise motion in systems like internal combustion engines and automated machinery.
What is the main function of a robotic mechanism?
A Perform tasks
B Reduce friction
C Increase speed
D Transfer power
Robotic mechanisms are designed to perform specific tasks like picking, lifting, or assembling objects. The mechanism includes actuators and joints that work together to produce both rotational and linear motions needed for task completion.
How does angular motion differ from linear motion?
A Angular motion is slower
B Linear motion involves rotation
C Angular motion involves rotation
D Angular motion has no speed
Angular motion involves the rotation of an object around a fixed axis, whereas linear motion refers to the movement along a straight line. Angular motion is fundamental in systems like gears, wheels, and engines.
What is the main advantage of using gear trains in mechanical systems?
A Control friction
B Change direction
C Alter speed
D Reduce power loss
Gear trains are primarily used to alter the speed and torque in mechanical systems. By adjusting the gear ratio, engineers can modify the rotational speed to suit the requirements of different mechanical applications.
What type of energy does a flywheel primarily store?
A Kinetic energy
B Chemical energy
C Thermal energy
D Potential energy
A flywheel stores kinetic energy due to its rotational motion. It helps maintain a steady speed by absorbing and releasing energy during fluctuations in the system, making it essential in engines and energy storage systems.
What is the purpose of mechanical vibration analysis in machines?
A Detect abnormalities
B Optimize speed
C Increase torque
D Measure energy efficiency
Mechanical vibration analysis is used to detect abnormalities such as imbalance, misalignment, or loose components in machines. Identifying these issues early prevents damage and allows for timely maintenance to avoid costly repairs.
What does a chain drive primarily transmit between two shafts?
A Force
B Energy
C Power
D Speed
A chain drive transmits mechanical power between two shafts, typically in applications requiring high torque. It is widely used in bicycles, motorcycles, and industrial machines due to its reliability and efficiency in power transmission.