GATE ME 2025 Set 1 — Question 29

MCQ+1 / -0.33EasyBalancing of Rotating MassesBalancing, Flywheels & GyroscopesTheory of Machines & VibrationsBalancing of Reciprocating Masses

Theory of Machines & Vibrations → Balancing, Flywheels & Gyroscopes → Balancing of Reciprocating Masses

Last updated 5 September 2026

Question

In the context of balancing of rotating and reciprocating masses, which one of the following options is true?

Correct answer (B) An unbalanced rigid rotor can be completely balanced using two balancing masses attached in two distinct planes Solution 1. Rigid Rotor Balancing: Static balancing (balancing of forces) can be achieved with a single mass in the plane of the center of gravity. However, dynamic balancing (balancing of both forces and couples) for a rigid rotor requires at least two balancing masses placed in two distinct planes. 2. Reciprocating Balancing: In a single-cylinder engine, the reciprocating inertia forces vary sinusoidally. While the primary force can be partially balanced by a rotating mass, the secondary forces and the varying nature of the primary force mean it cannot be completely balanced by rotating masses alone. Therefore, option (B) is the correct statement. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (B) An unbalanced rigid rotor can be completely balanced using two balancing masses attached in two distinct planes Solution 1. Rigid Rotor Balancing: Static balancing (balancing of forces) can be achieved with a single mass in the plane of the center of gravity. However, dynamic balancing (balancing of both forces and couples) for a rigid rotor requires at least two balancing masses placed in two distinct planes. 2. Reciprocating Balancing: In a single-cylinder engine, the reciprocating inertia forces vary sinusoidally. While the primary force can be partially balanced by a rotating mass, the secondary forces and the varying nature of the primary force mean it cannot be completely balanced by rotating masses alone. Therefore, option (B) is the correct statement.

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