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Torsion of Shafts MCQs

1. What is the primary concept behind pure torsion?

a) Bending and twisting of a shaft
c) Shearing of a shaft without bending

Explanation: Pure torsion involves the twisting of a shaft due to applied torque, without any bending or axial loading. This results in a shearing action across the shaft’s cross-section.

2. What is the torsion equation used for?

a) Calculating bending stresses in a shaft
b) Determining axial stresses in a shaft
c) Finding the shear stress in a twisted shaft
d) Analyzing compressive stresses in a shaft

Explanation: The torsion equation helps calculate the shear stress induced in a shaft due to applied torque, considering the shaft’s geometry and material properties.

3. How is the angle of twist of a shaft determined?

a) By analyzing the bending moment diagram
b) Using the moment of inertia of the shaft
c) By integrating the shear stress distribution along the shaft
d) Considering the applied torque and the shaft’s material properties

Explanation: The angle of twist of a shaft is determined by integrating the shear stress distribution along the length of the shaft, considering the applied torque and material properties.

4. Which type of shaft is more resistant to torsional loads?

a) Solid circular shafts
b) Hollow circular shafts
c) Rectangular shafts
d) Triangular shafts

Explanation: Hollow circular shafts are generally more resistant to torsional loads compared to solid circular shafts due to their distribution of material away from the central axis.

5. What is the significance of combined bending and torsion in shaft analysis?

a) It helps determine the shaft’s length
b) It identifies the material properties of the shaft
d) It measures the shaft’s diameter

Explanation: Combined bending and torsion analysis is significant as it accounts for realistic loading conditions where a shaft may experience both bending and torsional stresses simultaneously.

6. In unsymmetrical bending, what is the principal moment of inertia used for?

a) Determining the bending stress distribution
b) Calculating the angle of twist
c) Analyzing the shear stress distribution
d) Evaluating the axial stresses

Explanation: The principal moment of inertia is used to determine the bending stress distribution in unsymmetrical bending situations.

7. What does the shear center of a beam represent?

a) The point where bending stress is maximum
b) The location where shear stress is zero
c) The point where the beam experiences maximum torsion
d) The position where the beam’s centroid lies

Explanation: The shear center of a beam is the point within the beam’s cross-section where the application of loads results in pure translation without inducing twisting.

8. What determines the stress distribution in curved beams?

a) Only the curvature of the beam
b) The material properties of the beam
c) Both the curvature and material properties
d) Only the shape of the beam’s cross-section

Explanation: The stress distribution in curved beams is influenced by both the curvature of the beam and its material properties.

9. How does the stress distribution vary in pure bending of curved beams compared to straight beams?

a) Stress distribution remains the same
b) Stress distribution is uniform
c) Stress distribution varies along the curved beam
d) Stress distribution becomes concentrated at the centroid

Explanation: In pure bending of curved beams, the stress distribution varies along the curved beam due to the varying curvature, unlike straight beams where it’s uniform.

10. What is the significance of the position of the neutral axis in curved beams?

a) It indicates the point of maximum stress
b) It helps determine the beam’s curvature
c) It defines the location of zero stress
d) It determines the beam’s material properties

Explanation: The position of the neutral axis in curved beams defines the location where the bending stress is zero, helping in analyzing the stress distribution across the beam’s cross-section.