What is the primary function of a shaft in a mechanical system?
A To transfer torque
B To store energy
C To hold components
D To reduce friction
A shaft is a rotating machine element that transmits torque and rotational motion between components like gears, pulleys, and wheels. It plays a crucial role in transferring mechanical energy within mechanical systems.
What is the purpose of using bolts in machine design?
A To resist bending
B To connect components
C To reduce friction
D To store energy
Bolts are used to fasten or connect two or more components together. They create strong, removable connections and are essential in assembling mechanical structures or components where disassembly may be needed.
Which of the following materials is commonly used for bolts in machine design?
A Bronze
B Copper
C Aluminum
D Steel
Steel is commonly used for bolts because of its high tensile strength, durability, and resistance to corrosion. Steel bolts are able to withstand significant loads, making them ideal for a wide range of mechanical applications.
What is the main function of a rivet in machine design?
A To provide lubrication
B To transfer motion
C To join components
D To reduce wear
Rivets are used to permanently join two components together. They are especially useful in applications where welding or bolting is not feasible. Riveting is widely used in structural applications like bridges, aircraft, and ships.
What is the typical use of a key in machine design?
A To transfer motion
B To secure components
C To reduce friction
D To store energy
Keys are used to secure rotating components to shafts, preventing them from slipping. They are inserted into slots on both the shaft and the component, providing a secure connection to transfer rotational motion.
Which of the following is a key factor in determining the design of shafts?
A Weight
B Surface area
C Material cost
D Torsional strength
The torsional strength of a shaft determines its ability to withstand twisting forces. This factor is essential in shaft design because shafts often transmit rotational power, and insufficient torsional strength can lead to failure.
What is the most common method used to fasten two parts together with high precision?
A Adhesive bonding
B Bolting
C Welding
D Riveting
Bolting is one of the most common and precise methods for fastening parts together. Bolts provide strong, reliable connections that are easy to disassemble or adjust, making them ideal for machine components and structures.
What is the function of a washer in a bolt assembly?
A To reduce vibration
B To transfer torque
C To distribute load
D To store energy
Washers are used to distribute the load from the bolt or nut over a larger surface area. They prevent damage to the surface and help ensure that the bolt maintains its clamping force over time.
Which of these joints is commonly used for joining two parts at right angles in machine design?
A Corner joint
B Fillet joint
C T-joint
D Butt joint
A corner joint is used to connect two parts at right angles. It is commonly employed in structural and machine design where a simple, strong connection is needed to join components at perpendicular angles.
What is the main advantage of using a splined shaft in machine design?
A To store energy
B To prevent slipping
C To reduce weight
D To increase friction
A splined shaft has grooves that fit into corresponding splines on a mating part, creating a positive mechanical connection. This prevents slipping and allows for the efficient transfer of torque between components.
What is the effect of high tensile strength on a material used for machine components?
A Increased ductility
B Increased hardness
C Increased resistance to deformation
D Increased corrosion resistance
High tensile strength means that a material can resist deformation when subjected to pulling forces. It is crucial for machine components that experience tension, ensuring that they maintain their shape under operational loads without breaking.
Which type of material is commonly used for making shafts in high-torque applications?
A Stainless steel
B Aluminum
C Bronze
D Carbon steel
Carbon steel is commonly used for shafts in high-torque applications because of its high strength, durability, and ability to withstand significant forces. Its cost-effectiveness makes it a preferred choice for most machine components.
In which type of connection is a rivet typically used in machine design?
A Permanent connection
B Removable connection
C Rotational connection
D Adjustable connection
Rivets are used for permanent connections where disassembly is not required. Once a rivet is installed, it cannot be removed without damaging the parts, making it ideal for structural applications requiring strong, lasting connections.
Which of the following is the main function of a cotter pin in machine design?
A To transfer torque
B To lock components in place
C To distribute load
D To reduce friction
A cotter pin is used to lock components in place, preventing them from loosening due to vibration or external forces. It is typically used with nuts or bolts to secure parts in mechanical assemblies.
What is the main advantage of using an Allen bolt in machine design?
A Easy to assemble
B Aesthetic appearance
C High strength
D Corrosion resistance
Allen bolts, also known as hex socket bolts, are designed to provide high strength and torque resistance. The hexagonal socket allows for a better grip, reducing the risk of stripping and ensuring a secure fit in high-strength applications.