What is the purpose of a camshaft in an engine system?
A Transmit torque
B Control valve timing
C Reduce friction
D Generate power
The camshaft controls the timing of the engine’s intake and exhaust valves. It uses cams to push the valve lifters, determining when the valves open and close, which is essential for engine efficiency.
What type of motion does a crank-slider mechanism convert?
A Linear to rotary
B Rotary to oscillating
C Oscillating to linear
D Rotary to linear
A crank-slider mechanism converts rotary motion into linear motion. This type of mechanism is widely used in internal combustion engines, where the crankshaft drives the motion of the pistons.
What is the main function of a gear train in a machine?
A Store energy
B Change direction
C Transmit motion
D Increase torque
Gear trains are used to transfer rotational motion between shafts. They allow for speed and torque changes by using different gear sizes, making them essential for various mechanical systems such as engines and conveyors.
Which component in a cam mechanism determines the follower’s motion?
A Cam profile
B Follower shape
C Follower size
D Cam speed
The cam profile dictates how the follower moves. The cam’s shape determines the speed, direction, and distance the follower will travel, crucial for applications like valve control in engines.
What does a linkage system primarily control in a mechanical machine?
A Power generation
B Speed regulation
C Motion direction
D Force multiplication
Linkage systems control the direction and type of motion within machines. By connecting various components, linkages can convert rotary motion to linear motion or alter the motion direction to suit specific needs.
What is the primary function of a governor in a mechanical engine system?
A Control emissions
B Stabilize speed
C Increase power
D Control torque
A governor is designed to regulate and stabilize the speed of an engine. It automatically adjusts the fuel supply or other parameters to maintain a constant speed despite varying loads on the engine.
What does “backlash” in gear systems refer to?
A Gear misalignment
B Gear wear
C Gear teeth overlap
D Play between teeth
Backlash is the slight gap or clearance between meshing gear teeth. This gap prevents gears from jamming but can lead to inefficiencies in power transmission if too large, affecting accuracy and performance.
Which type of motion does a harmonic oscillator exhibit?
A Angular
B Linear
C Periodic
D Reciprocating
A harmonic oscillator exhibits periodic motion, where the motion repeats at regular intervals. This type of motion is fundamental in systems like springs and pendulums, which are key in vibration analysis.
What is the primary benefit of using a flywheel in a mechanical system?
A Store energy
B Reduce friction
C Improve efficiency
D Increase speed
A flywheel stores kinetic energy and helps to smooth out variations in rotational speed. It releases stored energy when needed, providing stability and smooth operation in systems like engines and turbines.
What is the function of a clutch in a power transmission system?
A Store energy
B Disconnect shafts
C Increase torque
D Change speed
A clutch is used to disconnect and reconnect two rotating shafts, enabling the smooth engagement and disengagement of power transmission. It is critical for systems requiring variable speed control, such as in vehicles.
How does a chain drive differ from a belt drive in power transmission?
A Efficiency
B Use of fluid
C Use of chains
D Flexible medium
A chain drive uses a chain to transfer power, while a belt drive uses a flexible belt. Chains are more durable and precise in transmitting power, especially in high-torque applications, while belts are more cost-effective for low-load systems.
What is a key advantage of using a gear train in machinery?
A Direction change
B Speed reduction
C Reduced vibrations
D Torque multiplication
Gear trains allow for torque multiplication by using different-sized gears. This enables systems to generate greater torque from a lower speed input, making gear trains ideal for heavy-duty machinery requiring high torque.
In a cam and follower mechanism, what type of motion does the follower exhibit when using a rise-and-fall cam?
A Uniform rise
B Constant motion
C Reverse motion
D Variable motion
In a rise-and-fall cam mechanism, the follower exhibits a uniform rise and fall pattern. This consistent movement is useful in applications such as valve control in internal combustion engines, where precise timing is necessary.
What is the effect of changing the gear ratio in a system?
A Reduces efficiency
B Increases friction
C Changes speed and torque
D Changes torque only
Changing the gear ratio alters both speed and torque. A higher ratio reduces speed but increases torque, while a lower ratio increases speed but decreases torque. This relationship is crucial for optimizing machine performance for different applications.
What does the term “inertia force” refer to in dynamic systems?
A Force due to acceleration
B Resistance to motion
C Force due to friction
D Force due to rotation
Inertia force is the force exerted by a mass due to its acceleration. It is a fundamental concept in dynamics, especially when analyzing the motion of components in machines that undergo rapid changes in velocity.