In a four‐bar linkage, what does the fixed link do?
A Provides rotational motion
B Transfers energy
C Serves as a base
D Connects moving links
In a four‐bar linkage, the fixed link serves as the base or frame that holds the other three links in place. This allows the remaining parts to move relative to it, enabling the desired motion.
What does the term “cam profile” refer to?
A Shape of the follower
B Shape of the cam surface
C Size of the cam
D Shape of the camshaft
The cam profile refers to the shape of the cam’s surface that determines how the cam interacts with the follower. This profile controls the motion of the follower, such as when it opens and closes engine valves.
In gear systems, what is the primary purpose of using a bevel gear?
A Increase torque
B Control speed
C Transmit power
D Change direction
Bevel gears are used to change the direction of rotational motion, typically at a 90-degree angle. They are commonly used in applications like automotive differentials, where the direction of power needs to be redirected.
What is the main purpose of a camshaft in an internal combustion engine?
A Control intake valves
B Provide ignition
C Regulate speed
D Control exhaust
The camshaft controls the opening and closing of intake and exhaust valves in an internal combustion engine. It ensures that the valves operate at the right times in relation to the position of the piston.
What is the significance of the gear ratio in a mechanical system?
A Increase power
B Change torque
C Change speed
D Change direction
The gear ratio is the ratio of the number of teeth on two meshing gears. It determines the speed at which one gear drives another, either increasing or decreasing rotational speed as needed in a system.
What is the function of a follower in a cam mechanism?
A Generate motion
B Follow the cam profile
C Transfer power
D Regulate speed
The follower in a cam mechanism follows the shape of the cam profile. This allows it to move in a specific pattern, such as opening or closing a valve, depending on the design of the cam.
What is the primary role of linkages in a machine?
A Transfer power
B Change direction of motion
C Control speed
D Convert motion
Linkages are used to convert one form of motion into another. For example, they can convert rotary motion to linear motion, such as in a piston engine. The arrangement of the links determines the motion produced.
What does the term “dynamic balancing” refer to in machine design?
A Minimizing vibrations
B Maintaining constant speed
C Increasing torque
D Increasing efficiency
Dynamic balancing refers to the process of balancing rotating components to reduce vibrations. It ensures that the mass is evenly distributed, preventing uneven wear, damage, and improving the smoothness of the machine’s operation.
What is the function of a gear train?
A Increase power
B Regulate torque
C Change speed
D Change direction
Gear trains are used to change the speed and torque in a mechanical system. By selecting gears of different sizes, a gear train adjusts the output speed relative to the input speed, typically for better performance or efficiency.
What is the purpose of a slider‐crank mechanism?
A Transmit power
B Regulate speed
C Convert rotary to linear motion
D Control vibration
The slider‐crank mechanism is used to convert rotary motion into reciprocating linear motion. This mechanism is commonly used in engines, where the crankshaft rotates and moves a piston in a linear direction.
What is the primary function of a clutch in a machine?
A Connect or disconnect
B Transfer power
C Increase torque
D Regulate speed
A clutch is used to engage or disengage the connection between two rotating shafts. It allows for smooth starting and stopping of power transmission, preventing damage to the system by slipping when necessary.
What is the main function of a flywheel in machinery?
A Increase torque
B Store energy
C Convert motion
D Regulate speed
The flywheel stores rotational energy and helps smooth out fluctuations in rotational speed. It compensates for uneven energy input, maintaining a constant speed and reducing the effect of energy surges.
What does “velocity ratio” in a gear system refer to?
A Ratio of gear teeth
B Ratio of input torque to output torque
C Ratio of output speed to input speed
D Ratio of input speed to output speed
The velocity ratio refers to the relationship between the output speed and input speed in a gear system. It is determined by the number of teeth on the gears involved and helps control the speed of the output shaft.
What type of force does a cam mechanism primarily generate?
A Linear force
B Rotational force
C Vibrational force
D Oscillatory force
A cam mechanism primarily generates linear force by translating rotational motion into linear motion. The cam profile determines the exact path and force applied to the follower, often used in engines to control valve timing.
What is the key purpose of a gear’s pitch diameter?
A Ensure proper meshing
B Increase efficiency
C Increase torque
D Control speed
The pitch diameter of a gear is crucial for ensuring proper meshing with other gears in a system. It defines the size of the gear and affects the load distribution and efficiency of the power transmission.