Top 50+ Solved Free Vibration MCQ Questions Answer
Q. Keeping the mass moment of inertia of both the shafts in a two rotor system same, if the length of one shaft is doubled what should be the effect on the length of other shaft?
a. Doubled
b. Halved
c. Constant
d. increased to 4 times
Q. In the figure given below, the points N1 and N2 are knownas_______
a. Nodes
b. Elastic points
c. Inelastic points
d. Breaking points
Q. In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction.
a. B in clockwise C in anticlockwise
b. C in clockwise B in anticlockwise
c. B and C in clockwise
d. B and C in anticlockwise
Q. For occurrence of free torsional vibration in a three rotor systemwhich of the condition is necessary?
a. Rotors moving in same direction
b. Rotors having same frequency
c. Rotors having different frequency
d. Rotors rotate in the same sense
Q. A vertical circular disc is supported by a horizontal stepped shaft as shown below. Determine equivalent length of shaft when equivalent diameter is 20 mm.
a. 1.559 m
b. 0.559 m
c. 0.633 m
d. None of the above
Q. In a three rotor system, for the middle rotor, if the stiffness of boththe length either side of the rotor is increased to two times what will
a. Remains constant
b. Decreases by two times
c. Increases by two times
d. Increases by 4 times
Q. 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
Q. The frequency of the free torsional vibration depends on…....
a. number of rotors
b. the number of nodes
c. Both a and b
d. Only b
Q. For a two rotor system, the mass moment of inertia of one shaft(A) is twice theother(B), then what is the relation between the length of the shafts.
a. 2L(A) = L(B)
b. L(A) = 2L(B)
c. L(A) = L(B)
d. 2L(A) = 3L(B)