What does a “velocity diagram” help analyze in machine kinematics?
A Gear ratios
B Motion paths
C Force distribution
D Angular velocity
A velocity diagram visually represents the relative velocities of different components in a mechanism. It helps engineers understand how motion is transmitted through the system, which is crucial for designing and analyzing mechanisms.
What is the primary function of a gear train?
A Increase torque
B Control direction
C Transmit power
D Reduce speed
Gear trains are used to transfer rotational power from one gear to another, ensuring the desired output speed and torque. They play a vital role in power transmission systems, including engines and machinery.
What is the purpose of a flywheel in a mechanical system?
A Increase torque
B Maintain speed
C Reduce friction
D Store kinetic energy
A flywheel stores kinetic energy to smooth out fluctuations in speed and provide consistent power output. It helps maintain the rotational energy of machinery, preventing speed variations and improving efficiency.
In a slider-crank mechanism, what type of motion does the slider perform?
A Linear motion
B Oscillating motion
C Rotational motion
D Angular motion
In a slider-crank mechanism, the slider moves in a straight line. This mechanism is widely used to convert rotary motion into linear motion, commonly found in engines and pumps.
Which component is used to convert rotary motion into linear motion in a camshaft system?
A Gear
B Linkage
C Follower
D Crank
In a camshaft system, the cam’s rotation drives the follower, which moves in a specific pattern. This converts the rotary motion of the cam into linear motion, crucial in applications like internal combustion engines.
What does the term “dynamic balancing” refer to in machinery?
A Controlling speed
B Smooth rotation
C Reducing wear
D Reducing power loss
Dynamic balancing ensures that rotating components like shafts or rotors are balanced to minimize vibrations. This is essential for smooth operation, reducing mechanical wear, and extending the life of the equipment.
What is the key role of a governor in an engine system?
A Stabilize vibrations
B Control motion
C Control torque
D Regulate speed
A governor regulates the speed of an engine by adjusting fuel or air intake based on load variations. This helps maintain a steady operational speed, preventing over-speeding and ensuring stable engine performance.
What does a cam profile determine in a cam mechanism?
A Torque transmission
B Speed
C Motion type
D Gear ratio
A cam profile dictates the specific movement of the follower in a cam mechanism. It determines how the follower moves, such as varying speeds or positions, which is essential for precise control in many machines.
In a cam mechanism, the “rise” refers to what?
A Follower motion
B Speed change
C Force applied
D Cam’s rotation
In cam mechanisms, the “rise” refers to the upward motion of the follower, driven by the cam. This is a key feature in determining the type of motion produced, essential for applications like engine valves.
What type of force is typically analyzed in dynamic balancing?
A Gravitational force
B Static force
C Inertial force
D Tension force
Dynamic balancing focuses on inertial forces, which are generated by the rotation of parts in a system. These forces must be balanced to reduce vibrations and ensure smooth operation in rotating machinery.
What is the primary function of a belt drive system?
A Reduce friction
B Transmit power
C Change direction
D Control speed
A belt drive system transmits rotational power from one shaft to another through a flexible belt. It is used to connect shafts in machines like engines, conveyor systems, and industrial equipment.
Which component in a mechanical system is responsible for absorbing energy from dynamic forces?
A Governor
B Flywheel
C Gearbox
D Damper
A damper absorbs excess energy from dynamic forces, typically in systems subjected to vibrations or shocks. It reduces the amplitude of oscillations and helps maintain stable machine operation.
What is a key characteristic of harmonic motion in mechanical systems?
A Rotational speed
B Linear motion
C Periodic oscillation
D Constant speed
Harmonic motion refers to periodic oscillations in mechanical systems, where the motion repeats at regular intervals. It is fundamental to systems like springs and pendulums and is characterized by sinusoidal motion.
What does “gear ratio” influence in a gear system?
A Speed and torque
B Vibration frequency
C Energy storage
D Power loss
The gear ratio defines the relationship between the input and output gears, determining how speed and torque are transferred. It influences the overall performance, making it crucial for designing gear systems.
In a gear system, what does “backlash” refer to?
A Gear teeth clearance
B Excessive speed
C Gear failure
D Gear teeth wear
Backlash is the slight gap or clearance between meshing gear teeth. This allows for smooth engagement but can cause inefficiencies if too large. It is important to minimize backlash for precise gear movement.