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Mr. Dubey • 51.43K Points
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Q. 81) Calculate equivalent stiffness of the spring for the system shown below, which has spring stiffness of 3000 N/m

(A) 1000 N/m
(B) 2250 N/m
(C) 2000 N/m
(D) None of the above
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Mr. Dubey • 51.43K Points
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Q. 82) Which of the following is incorrect regarding inertia force?

(A) Imaginary force
(B) Acts upon a rigid body
(C) Brings the body to equilibrium
(D) Same direction as of accelerating force
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Mr. Dubey • 51.43K Points
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Q. 83) D-Alembert’s principle is used for which of the following?

(A) Change static problem into a dynamic problem
(B) Change dynamic problem to static problem
(C) To calculate moment of inertia of rigid bodies
(D) To calculate angular momentum of a system of masses
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Mr. Dubey • 51.43K Points
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Q. 84) Determine logarithmic decrement, if the amplitude of a vibrating body reduces to 1/6th in two cycles.

(A) 0.223
(B) 0.8958
(C) 0.389
(D) None of the above
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Mr. Dubey • 51.43K Points
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Q. 85) Calculate logarithmic decrement if damping factor is 0.33.

(A) 1.36
(B) 3.23
(C) 5.16
(D) 2.19
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Mr. Dubey • 51.43K Points
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Q. 86) In damped free vibrations, which parameters indicate vibrations?

(A) Natural frequency
(B) Rate of decay of amplitude
(C) Both a. and b.
(D) None of the above
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Mr. Dubey • 51.43K Points
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Q. 87) What is meant by critical damping coefficient?

(A) Frequency of damped free vibrations is less than zero
(B) The motion is aperiodic in nature
(C) Both a. and b.
(D) None of the above
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Mr. Dubey • 51.43K Points
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Q. 88) Which of the following relations is true for viscous damping?

(A) Force α relative displacement
(B) Force α relative velocity
(C) Force α (1 / relative velocity)
(D) None of the above
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Mr. Dubey • 51.43K Points
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Q. 89) Which among the following is the value of static deflection (δ) for a fixed beam with central point load?

(A) (Wl3) /(192 EI)
(B) (Wl2) /(192 EI)
(C) (Wl3) /(384 EI)
(D) None of the above
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Mr. Dubey • 51.43K Points
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Q. 90) According to which method, maximum kinetic energy at mean position is equal to maximum potential energy at extreme position?

(A) Energy method
(B) Rayleigh's method
(C) Equilibrium method
(D) All of the above
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