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Q: The axis about which the product of inertia is zero is called:
  • A. Parallel axis
  • B. Complimentary axis
  • C. Perpendicular axis
  • D. Principle axis
Correct Answer: Option D - Principle axis– The axis about which the product of inertia of a plane area is zero, is called the principal axis. The moment of inertia about a principle axis is called the principle moment of inertia. • For a plane area, moment of inertia is always positive but the product of inertia may be positive, negative or zero depending upon object's shape and orientation of coordinate axis.
D. Principle axis– The axis about which the product of inertia of a plane area is zero, is called the principal axis. The moment of inertia about a principle axis is called the principle moment of inertia. • For a plane area, moment of inertia is always positive but the product of inertia may be positive, negative or zero depending upon object's shape and orientation of coordinate axis.

Explanations:

Principle axis– The axis about which the product of inertia of a plane area is zero, is called the principal axis. The moment of inertia about a principle axis is called the principle moment of inertia. • For a plane area, moment of inertia is always positive but the product of inertia may be positive, negative or zero depending upon object's shape and orientation of coordinate axis.