What is the primary purpose of a governor in a mechanical system?
A Regulate speed
B Transmit power
C Convert motion
D Control torque
A governor regulates the speed of an engine or other mechanical system by adjusting the power input based on load. It ensures the system runs at a constant speed, even with varying loads, enhancing stability and efficiency.
What type of motion does a cam mechanism produce?
A Vibratory
B Combined
C Rotary
D Linear
A cam mechanism is designed to convert rotary motion into precise linear motion. The cam profile dictates how the follower moves, allowing for controlled motion sequences, commonly used in engines for valve timing.
How does a slider‐crank mechanism work in an engine?
A Increases torque
B Controls valve timing
C Converts rotary to linear motion
D Changes speed
The slider‐crank mechanism converts the rotary motion of the crankshaft into linear motion for the piston. This reciprocating motion is necessary in internal combustion engines for the compression and combustion processes.
What does torque analysis help engineers determine?
A Speed variation
B Force distribution
C Power output
D Rotational motion
Torque analysis helps engineers understand how forces are distributed in a rotating system. It aids in designing systems that can safely and efficiently handle the forces acting on rotating components, ensuring optimal performance.
What is the function of dynamic balancing in machinery?
A Reduce vibration
B Change speed
C Store energy
D Transmit power
Dynamic balancing is used to ensure that rotating components are balanced, minimizing vibrations. This reduces wear and tear on machine components, improves stability, and enhances the system’s overall efficiency and longevity.
What is the role of gear ratios in mechanical systems?
A Change speed
B Control torque
C Regulate power
D Increase efficiency
Gear ratios determine how the rotational speed and torque are transferred between gears. By adjusting the number of teeth on each gear, engineers can change the speed of the output shaft relative to the input shaft.
What is the purpose of a flywheel in an engine?
A Increase speed
B Store energy
C Control power
D Change direction
A flywheel stores kinetic energy in the form of rotational motion. It helps smooth out fluctuations in engine speed by absorbing energy when the engine speed is high and releasing it when the speed drops.
What does a cam profile in a cam mechanism control?
A Speed
B Torque
C Direction
D Follower motion
The cam profile dictates the precise motion of the follower. It defines how the follower moves in response to the cam’s rotation, which is crucial in applications such as controlling the timing of engine valves.
How do belt drives differ from chain drives?
A No slippage
B More precise
C Slippery
D Less maintenance
Belt drives rely on friction for power transmission and can slip under heavy loads, whereas chain drives provide a positive drive with no slippage. Chain drives are more reliable for high‐torque applications requiring precision.
What is the significance of dynamic forces in mechanical systems?
A Determine motion
B Store energy
C Change speed
D Regulate power
Dynamic forces arise due to the motion of components in a system. These forces influence the system’s behavior and performance, and their analysis is critical for ensuring safe and efficient operation under varying loads and conditions.
What does a velocity diagram show in mechanism analysis?
A Force distribution
B Acceleration
C Power consumption
D Speed variation
A velocity diagram graphically represents the speeds of different parts in a mechanism. It helps engineers analyze the relationship between the components’ speeds, allowing for the optimization of system performance and motion control.
What does the term “mechanical advantage” refer to?
A Energy loss
B Power conversion
C Force multiplication
D Speed increase
Mechanical advantage refers to the factor by which a machine amplifies the input force to produce a greater output force. It is a fundamental concept in mechanical systems that helps reduce the effort required to perform tasks.
How does a gear train affect rotational motion in a system?
A Transfer power
B Change torque
C Change direction
D Increase speed
Gear trains are used to modify the torque in a system. By adjusting the gear sizes, engineers can either increase the torque and decrease the speed, or vice versa, based on the system’s requirements.
What does synthesis of mechanisms aim to achieve?
A Create motion sequences
B Increase efficiency
C Power transmission
D Reduce friction
The synthesis of mechanisms involves designing the motion paths and sequences for mechanical systems. Engineers use this process to create effective mechanisms that achieve the desired motion for specific tasks, such as in linkages or cam systems.
What is the purpose of mechanical vibration analysis?
A Regulate power
B Control force
C Detect irregularities
D Improve speed
Mechanical vibration analysis is used to detect irregularities such as imbalance, misalignment, or wear in moving parts. Identifying these issues early helps prevent mechanical failure and maintain smooth, efficient operation of the system.
