DESIGN OF MACHINE ELEMENT- UNIT 2 MOODLE-15 MARCH 2025

Which of the following is NOT a factor considered in the design of solid shafts?

• Strength

• Rigidity

• Material density

• Fatigue strength

When designing a hollow shaft, which of the following is the primary advantage over a solid shaft?

• Greater strength

• Reduced weight for the same strength

• Lower cost

• Higher rigidity

The primary design consideration for shafts subjected to torsional loads is:

• Shear stress

• Bending stress

• Axial stress

• Tensile strength

The rigidity of a shaft primarily depends on which of the following parameters?

• Length and diameter of the shaft

• Material density

• Surface finish of the shaft

• Mass of the shaft

For the design of a shaft subjected to both bending and torsion, the maximum stress occurs at:

• The center of the shaft

• The outer surface of the shaft

• The neutral axis

• The support points

What is the main disadvantage of using a hollow shaft over a solid shaft?

• Higher weight

• Reduced strength

• Increased manufacturing complexity

• Lower rigidity

Which of the following is true about the design of rigid couplings?

• They are used to connect shafts of different sizes.

• They allow for angular misalignment between connected shafts.

• They transmit torque without allowing for axial movement.

• They provide flexibility to accommodate misalignment.

A flange coupling is primarily used to connect two shafts that are:

• Very flexible

• Aligned along a common axis

• Subjected to large angular misalignment

• Not rigidly connected

Box couplings are typically used for connecting shafts that:

• Have a very small diameter

• Are subject to large vibrations

• Have misalignment between them

• Need to transmit high torque with angular displacement

The main function of a flexible coupling is to:

• Reduce vibrations between connected shafts

• Provide a rigid connection between shafts

• Allow for slight misalignment between shafts

• Increase the efficiency of torque transmission