What is the primary purpose of mechanical advantage in a machine?
A Force multiplication
B Direction control
C Speed enhancement
D Power transmission
Mechanical advantage refers to the factor by which a machine amplifies the force applied to it. It allows small input forces to move heavier loads, making tasks like lifting easier without increasing the required effort.
What does dynamic balancing help reduce in rotating machinery?
A Torque
B Friction
C Vibration
D Speed
Dynamic balancing reduces vibrations in rotating machinery by ensuring the mass is evenly distributed around the rotating axis. This minimizes vibrations, leading to smoother operation and extended lifespan of the machine.
How does a gyroscope stabilize a moving system?
A Store energy
B Maintain orientation
C Transmit force
D Control speed
A gyroscope resists changes to its axis of rotation due to angular momentum. This resistance helps maintain the orientation of a system, which is particularly useful in applications like navigation and stability control in vehicles.
What type of motion is associated with a cam mechanism?
A Oscillating motion
B Variable motion
C Linear motion
D Uniform motion
A cam mechanism produces variable motion in the follower, depending on the cam profile. This type of motion allows precise control of the follower’s movement, which is essential for valve timing in engines and other applications.
What is the primary function of a flywheel in a mechanical system?
A Transmit torque
B Increase speed
C Store energy
D Absorb shocks
A flywheel stores rotational energy and helps smooth out speed fluctuations in machines. It absorbs energy during periods of high speed and releases it during low speed, ensuring consistent performance and stability in mechanical systems.
In a dynamic system, what is the inertia force?
A Force due to gravity
B Force due to friction
C Force due to speed
D Force due to acceleration
Inertia force is the force generated by a mass when it accelerates. It resists changes in motion, meaning the greater the acceleration, the greater the inertia force. This force is important in dynamic analysis of moving systems.
What is the function of a governor in an engine?
A Increase power
B Stabilize speed
C Reduce friction
D Control torque
A governor regulates the speed of an engine by adjusting the fuel or air intake. It automatically responds to changes in load to maintain a constant engine speed, ensuring stable operation and preventing over-speeding.
What does “gear ratio” determine in a gear system?
A Speed and torque
B Gear teeth size
C Friction levels
D Load capacity
The gear ratio defines the relationship between the speed and torque of the input and output shafts in a gear system. A higher ratio decreases speed but increases torque, and vice versa, depending on the application.
What type of force does a cam mechanism primarily generate?
A Torque
B Radial force
C Variable force
D Linear force
A cam mechanism generates variable forces that change depending on the cam profile. These forces are crucial for applications that require precise control over motion, like engine valves, where force changes are needed at different phases.
Which of these components helps in power transmission in mechanical systems?
A Damper
B Governor
C Pulley
D Gear
Gears are essential components for transmitting power in mechanical systems. By meshing with other gears, they transfer torque and rotational motion, ensuring the required speed and force transmission in machines like engines and conveyors.
What is a common application of linkages in mechanical machines?
A Power transmission
B Motion conversion
C Force generation
D Speed control
Linkages are used to convert types of motion, such as converting rotary motion into linear motion, or altering motion direction. They are widely used in mechanisms like suspension systems, robotic arms, and mechanical presses.
What does dynamic analysis in machine systems focus on?
A Material strength
B Static force
C Accelerating forces
D Energy losses
Dynamic analysis in machine systems focuses on forces that result from acceleration and motion. It involves calculating forces, such as inertia and centrifugal forces, which influence the stability and efficiency of machines under motion.
Which mechanism typically converts rotary motion into linear motion?
A Slider-crank
B Pulley
C Gear
D Cam
A slider-crank mechanism is commonly used to convert rotary motion into linear motion. It is found in many applications, such as internal combustion engines, where the crankshaft’s rotation moves the piston in a straight line.
What is the primary purpose of dynamic balancing in machines?
A Reduce vibrations
B Increase power
C Improve speed
D Reduce wear
Dynamic balancing ensures that rotating parts, like shafts, are balanced to minimize vibrations. Reducing vibrations improves the machine’s performance, reduces wear, and extends the lifespan of mechanical systems that operate at high speeds.
Which of these is used to reduce vibration in rotating systems?
A Gearbox
B Flywheel
C Damper
D Governor
A damper is used to absorb and reduce vibrations in rotating systems. It dissipates the kinetic energy from vibrations, preventing excessive oscillations that could damage components and lead to inefficiencies or failures.