Exercise 9.14 Multiple choice type questions, give only the best single answer

(i) In the expansion theorem while performing the modal analysis of a rotor system

(A) The response is expressed as summation of eigen functions with constant coefficients.

(B) The eccentricity is expressed as summation of eigen functions with constant coefficients

(D) Bearing force is expressed as function of stiffness and damping coefficients

(ii) In Rayleigh's proportional damping, the following is true (where α and ß are constant)

(iv) The static condensation is a technique used in finite element methods

(A) to reduce the overall DOFs of system

(B) to increase the overall DOFs of the system

(D) to decouple the system equation without disturbing the DOFs of the system

(v) While developing the static condensation scheme

(A) the stiffness and damping matrix is ignored

(B) the mass and damping matrix is ignored

(D) the force vector is ignored

(vi) With general damping in a dynamical system would have eigen values as

.......(A) complex..... (B) real ......(C) pure imaginary ......(D) mixed of real and imaginary

(vii) With general damping in a dynamical system would have eigen vectors as

.......(A) complex .....(B) real ......(C) pure imaginary ......(D) mixed of real and imaginary

(viii) With proportional damping in a dynamical system would have eigen vectors as

(A) complex with purely real or imaginary part ......(B) real ......(C) pure imaginary

(D) mixed of real and imaginary

Answer : (i) A (ii) C (iii) B (iv) A (v) B (vi) A (vii) A (viii) A