What is the primary purpose of an acceleration diagram in kinematics?
A Force calculation
B Velocity calculation
C Motion prediction
D Speed analysis
The acceleration diagram is used to analyze the acceleration of different parts in a mechanism. It helps engineers predict how components accelerate and decelerate, which is essential for motion planning and control.
Which of the following is used to reduce vibration in rotating machinery?
A Damper
B Pulley
C Gearbox
D Flywheel
A damper absorbs the excess energy from dynamic forces like vibrations, reducing their amplitude. This results in smoother operation, reduced wear, and enhanced performance of rotating machinery.
Which mechanism is used to convert rotational motion into reciprocating motion?
A Pulley
B Cam
C Linkage
D Gear
A cam mechanism is designed to convert rotational motion into reciprocating motion. It provides precise control over the follower’s movement, and is commonly used in engines and automated machinery.
What does the term “mechanical advantage” refer to in machine design?
A Energy efficiency
B Speed increase
C Force multiplication
D Torque reduction
Mechanical advantage is a measure of how a machine amplifies the force applied to it. It allows for easier operation by using less effort to perform tasks, such as lifting or moving heavy loads.
What type of motion does the link in a four-bar linkage produce?
A Linear motion
B Circular motion
C Reciprocating motion
D Oscillating motion
A four-bar linkage typically produces oscillating motion. It is used in various mechanical systems, like the suspension systems of vehicles, to convert input motion into a desired output.
Which of these is a key feature of a gyroscope in machine dynamics?
A Stability enhancement
B Speed regulation
C Vibration damping
D Power generation
A gyroscope enhances stability in rotating machinery. It resists changes to its axis of rotation, making it useful in applications requiring stability control, such as in navigation systems and robotic arms.
What is the purpose of a chain drive in mechanical systems?
A Direction control
B Vibration reduction
C Speed control
D Power transmission
A chain drive transmits rotational power between shafts through a chain and sprockets. It is commonly used in applications where efficient power transmission over short distances is needed, such as in bicycles or industrial machinery.
What type of motion does an eccentric cam produce in its follower?
A Rotational motion
B Variable motion
C Reciprocating motion
D Uniform motion
An eccentric cam produces variable motion in its follower. The cam’s shape causes the follower to move at varying speeds, which is useful for applications like valve timing in internal combustion engines.
Which of the following defines the term “inertia force”?
A Force due to rotation
B Force due to motion
C Force due to acceleration
D Force due to resistance
Inertia force is the force experienced by an object due to its acceleration or deceleration. It is directly related to the mass of the object and is an important factor in dynamic force analysis.
What is the role of a flywheel in controlling speed fluctuations?
A Store kinetic energy
B Transmit power
C Change direction
D Increase speed
A flywheel stores kinetic energy to smooth out fluctuations in speed. It acts as an energy reservoir, releasing stored energy during deceleration and absorbing excess energy during acceleration, maintaining consistent machine speed.
In a dynamic system, what do dynamic forces generally result from?
A Friction between parts
B Gravitational pull
C Material strength
D Motion of parts
Dynamic forces arise from the motion of parts within a system. They are particularly significant in rotating and reciprocating machinery, where changes in velocity or direction generate forces that influence system stability and performance.
What does a gear ratio influence in a gear system?
A Power only
B Speed only
C Speed and torque
D Friction level
The gear ratio determines the relationship between the input and output speeds and torques in a gear system. A higher ratio increases torque but reduces speed, while a lower ratio does the opposite.
What is the primary function of an accelerometer in machine dynamics?
A Measure force
B Measure acceleration
C Measure speed
D Measure torque
An accelerometer measures the acceleration of a moving object. In machine dynamics, it helps monitor the acceleration forces acting on components, which is critical for assessing performance and detecting anomalies like vibrations.
Which component is typically used to convert rotary motion into linear motion in an internal combustion engine?
A Crankshaft
B Camshaft
C Flywheel
D Gear
The crankshaft converts the rotary motion of the pistons into linear motion, which drives the vehicle’s wheels. It plays a crucial role in the operation of internal combustion engines.
What is the primary use of linkages in mechanical systems?
A Increase torque
B Reduce vibrations
C Control motion
D Transmit power
Linkages are used in mechanical systems to control and transfer motion between parts. They can provide specific movement profiles, such as converting rotational motion into linear motion or changing the direction of movement.