Mechanical Vibrations (Multiple Choice Questions) MCQs Quiz

Here Mechanical Vibrations Multiple Choice Questions) MCQs Quiz with answers that help you to revise your Mechanical vibration skills before exams.

Mechanical vibration MCQ Questions With Answers

Q1. A slender shaft supported on two bearings at its ends carries a disc with an eccentricity e from the axis of rotation. The critical speed of the shaft is N. If the disc is replaced by a second one of same weight but mounted with an eccentricity 2e, critical speed of the shaft in the second case is

• Nc/√ 2
• Nc/2
• Nc
• 2 Nc

Q2. A uniform cantilever beam undergoes transverse vibrations. The number of natural frequencies associated with the beam is

• 1
• 10
• 100
• infty ∞

Q3. When a shaking force is transmitted through the spring, damping becomes less than the applied force when the ratio of its frequency to the natural frequency is greater than

• 0.25
• 0.5
• 1
• √2

Q4. The rotor of a turbine is generally rotated at

• the critical speed
• a speed much below the critical speed
• a speed much above the critical speed
• a speed having no relation to critical speed

Q5. For steady-state forced vibrations, the phase lag at resonance is

• 0°0\degree0°
• 45°45\degree45°
• 90°90\degree90°
• 180°180\degree180°

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