Explore topic-wise MCQs in Machine Dynamics.

This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Dynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

Increasing which of the following factor would result in increase of free torsional vibration?

A. Radius of gyration
B. Mass moment of inertia
C. Polar moment of inertia
D. Length
Answer» D. Length
Discussion
2.

Free torsional vibrations will occur in a two rotor system only if both rotors have same frequency.

A. True
B. False
Answer» B. False
Discussion
3.

If the mass of the constraint is negligible and a mass is attached at the end of the rod having following values: Ic = 500 Kg-m2 and ω= 10 rad/s, then calculate the kinetic of the constraint system.

A. 8333 J
B. 7363 J
C. 4578 J
D. 9333 J
Answer» B. 7363 J
Discussion
4.

If the mass of the constraint is negligible then what is the kinetic energy of the system?

A. 0
B. Half the value
C. Double the value
D. Infinite
Answer» B. Half the value
Discussion
5.

If Ic = 500 Kg-m2 and ω = 10 rad/s, calculate the kinetic of the constraint.

A. 8333 J
B. 7363 J
C. 4578 J
D. 9333 J
Answer» B. 7363 J
Discussion
6.

If Ic = 125 Kg-m2 and ω= 20 rad/s, calculate the kinetic of the constraint.

A. 8333 J
B. 7333 J
C. 6333 J
D. 9333 J
Answer» B. 7333 J
Discussion
7.

If a mass whose moment of inertia is Ic/3 is placed at the free end and the constraint is assumed to be of negligible mass, then the kinetic energy is ______

A. 1/6 Icω2
B. 1/2Icω2
C. 1/3Icω2
D. 1/12Icω2
Answer» B. 1/2Icω2
Discussion
8.

A flywheel is mounted on a vertical shaft. The both ends of a shaft are fixed and its diameter is 50 mm. The flywheel has a mass of 500 kg, the modulus of rigidity for the shaft material is 80 GN/m2 and its radius of gyration is 0.5 m. Find the natural frequency of torsional vibrations.

A. 5.32
B. 5.86
C. 5.65
D. 6.66
Answer» B. 5.86
Discussion