What is the purpose of a crank in a mechanical system?
A Increase torque
B Convert motion
C Change direction
D Store energy
A crank is used to convert rotational motion into reciprocating motion or vice versa. It is widely used in engines to move pistons in a linear path as part of the slider‐crank mechanism.
Which component is used to change the direction of rotation in a machine?
A Pulley
B Bearing
C Gear
D Shaft
Gears are commonly used to change the direction of rotation in machines. By meshing with another gear, they alter the direction and speed of rotational movement within a system.
What is the primary function of a governor in an engine?
A Increase efficiency
B Regulate power
C Reduce friction
D Maintain speed
A governor is designed to automatically regulate the speed of an engine by adjusting the fuel or air supply, ensuring the engine maintains a consistent speed despite variations in load.
What is the main advantage of using a chain drive over a belt drive?
A No slippage
B Less noise
C Higher torque
D No maintenance
A chain drive provides a positive drive, meaning there is no slippage between the driving and driven components. This ensures accurate and reliable power transmission, unlike belt drives which can slip.
What is the significance of the moment of inertia in rotational motion?
A Determines torque
B Determines speed
C Determines resistance to motion
D Determines acceleration
The moment of inertia is a measure of an object’s resistance to changes in its rotational motion. It depends on the mass and distribution of the mass relative to the axis of rotation.
Which of the following is used to analyze the motion of a camshaft?
A Gear ratio
B Cam profile
C Linkage diagram
D Velocity diagram
The cam profile is used to analyze the motion of the camshaft in an engine. It dictates how the cam interacts with the followers, determining the opening and closing times of engine valves.
What is the effect of increasing the number of teeth in a gear system?
A Decreases torque
B Increases speed
C Decreases speed
D Increases torque
Increasing the number of teeth in a gear system results in a greater mechanical advantage, allowing for higher torque transmission while reducing the speed at the output side.
What is the primary function of a flywheel in a machine?
A Increase torque
B Convert energy
C Maintain speed
D Reduce vibrations
The flywheel stores rotational energy and helps maintain a consistent speed by absorbing variations in energy input, thus smoothing out fluctuations and ensuring steady operation in machinery.
Which of the following mechanisms is used to convert rotary motion into linear motion?
A Slider‐crank
B Cam mechanism
C Pulley system
D Gearbox
The slider‐crank mechanism is used to convert rotary motion from a crank into linear motion, typically seen in piston engines where the crankshaft rotates and drives the piston in a reciprocating motion.
What does the term “kinematic analysis” involve?
A Determining energy loss
B Calculating torque
C Analyzing motion
D Analyzing forces
Kinematic analysis involves studying the motion of points, bodies, or systems without considering the forces causing the motion. It includes concepts such as displacement, velocity, and acceleration.
What does the term “mechanical advantage” refer to?
A The force applied by a machine
B The speed of the system
C The energy consumed by the system
D The ratio of output to input force
Mechanical advantage is the ratio of the force exerted by the machine (output force) to the force applied to the machine (input force). It helps in understanding the amplification of force by a mechanical system.
What is the main function of a chain drive?
A Transfer power
B Regulate speed
C Convert torque
D Control vibrations
A chain drive is used to transfer mechanical power from one shaft to another by means of a chain. It is commonly used in machines like bicycles and conveyor systems to transmit power efficiently over long distances.
Which of the following is a key element in analyzing vibrational motion?
A Mass
B Damping
C Speed
D Inertia
Damping is essential in analyzing vibrational motion as it refers to the process by which the amplitude of vibrations reduces over time due to the dissipation of energy, ensuring stable operation in mechanical systems.
What is the purpose of a gear train in a mechanical system?
A Increase efficiency
B Regulate torque
C Change speed
D Store energy
Gear trains are used to change the speed of rotational motion. By using different gear sizes, gear trains adjust the output speed and torque to meet the needs of the system.
What does the term “gyroscopic effect” refer to in rotating machinery?
A Resistance to angular acceleration
B Change in torque
C Increase in rotational speed
D Resistance to linear motion
The gyroscopic effect refers to the resistance of a rotating body to changes in its axis of rotation. It is a crucial factor in the design of rotating machinery and vehicles, affecting stability and control.