What is the primary function of a chain drive in mechanical systems?
A Control motion
B Transfer power
C Increase torque
D Reduce speed
A chain drive is used to transfer power between two shafts. Unlike belt drives, chain drives provide a positive drive, meaning they do not slip, ensuring precise power transmission with minimal loss.
What is the main purpose of using a belt drive in machinery?
A Change speed
B Increase efficiency
C Transfer power
D Reduce friction
A belt drive transmits power between two rotating shafts, typically using a flexible belt. It is commonly used for medium‐distance power transmission in applications like conveyor systems and fan drives, offering smooth operation.
What is the function of a slider‐crank mechanism in engines?
A Transfer torque
B Change power
C Regulate speed
D Convert rotary to linear motion
The slider‐crank mechanism converts rotary motion from the crankshaft into linear motion for the piston. This conversion is fundamental in internal combustion engines, enabling the reciprocating motion necessary for combustion.
What does the synthesis of mechanisms involve?
A Designing moving parts
B Vibrational study
C Force calculation
D Torque analysis
Synthesis of mechanisms involves designing and arranging mechanical components to achieve desired motion or task objectives. It includes determining the configuration and type of motion that parts should undergo in a system.
What is the effect of increasing the number of teeth on a gear?
A Increases power
B Increases speed
C Increases torque
D Reduces friction
Increasing the number of teeth on a gear increases its torque capacity. This happens because the larger gear transfers more force while reducing the output speed, allowing higher torque to be delivered to the driven shaft.
What is the primary benefit of using a cam mechanism in engines?
A Control exhaust
B Regulate valve timing
C Control speed
D Increase power
In engines, a cam mechanism regulates the timing of valve openings and closings. The shape of the cam determines the lift and duration of valve movement, directly affecting engine performance and efficiency.
What does a dynamic balancing system primarily aim to reduce?
A Friction
B Power loss
C Vibrations
D Speed variations
Dynamic balancing is used to reduce vibrations in rotating components. By ensuring that the mass is evenly distributed, it minimizes the negative impact of imbalances, preventing wear, instability, and mechanical failures.
What does a gear ratio determine in a mechanical system?
A Force distribution
B Power output
C Speed and torque
D Friction level
A gear ratio determines the relationship between input and output speeds and torques. It directly affects how rotational motion is transmitted through gears, controlling the speed at which one gear turns relative to another.
What does a cam profile control in a mechanical system?
A Transmit power
B Increase engine speed
C Follower motion
D Regulate fuel intake
The cam profile determines the motion of the follower. It dictates the timing, displacement, and speed of the follower, which is essential in systems like internal combustion engines for precise valve timing.
What is the purpose of a clutch in a mechanical drive system?
A Increase torque
B Disengage motion
C Transfer power
D Change speed
A clutch is used to disengage and engage the power transmission between two rotating shafts. This allows for smooth starting and stopping, preventing sudden jerks or damage to the mechanical components.
What is the function of a gear train?
A Change direction
B Absorb shock
C Alter speed
D Control torque
A gear train changes the speed of rotation between connected shafts. By adjusting the size and arrangement of the gears, engineers can modify the rotational speed and torque according to the requirements of the system.
How does a camshaft control engine valve timing?
A Opens exhaust valves
B Maintains engine speed
C Regulates fuel intake
D Controls cam follower
The camshaft controls the movement of the cam followers, which in turn control the opening and closing of the engine’s intake and exhaust valves. Precise timing ensures efficient engine operation and performance.
What type of force does dynamic balancing aim to minimize in rotating parts?
A Centrifugal force
B Radial force
C Inertial force
D Gravitational force
Dynamic balancing minimizes centrifugal forces caused by the rotation of unbalanced components. Proper balancing ensures smoother operation, preventing wear, vibrations, and reducing the risk of mechanical failure in rotating machinery.
What does the term “torque” refer to in mechanical systems?
A Rotational force
B Linear force
C Force on the shaft
D Speed of rotation
Torque refers to the rotational force applied to an object. It is crucial in determining how effectively a mechanical system transfers rotational energy and how much force is needed to rotate a given part.
What is the primary benefit of using chain drives in power transmission?
A Compact design
B Low cost
C High efficiency
D High speed
Chain drives are highly efficient in transmitting power with minimal slippage, making them ideal for systems where precise and reliable power transfer is crucial. They are especially useful in high‐torque applications like vehicles and machinery.