MCQs of Fundamentals of Earthquake Vibrations of buildings (Earthquake Engineering - 3160621)

Earthquake Engineering (3160621) MCQs

MCQs of Fundamentals of Earthquake Vibrations of buildings

Showing 1 to 10 out of 53 Questions

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

(a)	free vibration
(b)	forced vibration
(c)	damped vibration
(d)	none of the mentioned

When there is a constant amplitude over every cycle of vibration, then the body is said to have

(a)	free vibration
(b)	forced vibration
(c)	undamped vibration
(d)	none of the mentioned

In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

(a)	$\frac{x_{1}}{x_{2}}$
(b)	$\ln (\frac{x_{1}}{x_{2}})$
(c)	$\log_{e} (\frac{x_{1}}{x_{2}})$
(d)	$\log (\frac{x_{1}}{x_{2}})$

The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

(a)	damping factor
(b)	damping coefficient
(c)	logarithmic decrement
(d)	magnification factor

Two springs have spring stiffness of 1500 N/m and 2000 N/m respectively. If they are connected in series, what is the spring stiffness of an equivalent system.

(a)	3500 N/m
(b)	1166 N/m
(c)	857.63 N/m
(d)	None of the above

Two springs have spring stiffness of 1000 N/m and 2000 N/m respectively. If they are connected in parallel, what is the spring stiffness of an equivalent system.

(a)	3000 N/m
(b)	1166 N/m
(c)	857.63 N/m
(d)	None of the above

Which of the following relations is true when springs are connected parallelly? where K = spring stiffness

(a)	$K_{e} = K_{1} + K_{2}$
(b)	$\frac{1}{K_{e}} = \frac{1}{K_{1}} + \frac{1}{K_{2}}$
(c)	$K_{e} = \frac{1}{K_{1}} + \frac{1}{K_{2}}$
(d)	None of the above

Which of the following relations is true when springs are connected parallelly? where K = spring stiffness

(a)	$K_{e} = K_{1} + K_{2}$
(b)	$\frac{1}{K_{e}} = \frac{1}{K_{1}} + \frac{1}{K_{2}}$
(c)	$K_{e} = \frac{1}{K_{1}} + \frac{1}{K_{2}}$
(d)	None of the above

What are deterministic vibrations?

(a)	Vibrations caused due to known exciting force.
(b)	Vibrations caused due to unknown exciting force.
(c)	Vibrations which are aperiodic in nature.
(d)	None of the above.

10.

In which type of vibrations, amplitude of vibration goes on decreasing every cycle?

(a)	Damped vibrations
(b)	Undamped vibrations
(c)	Both (a) and (b)
(d)	None of the above

Showing 1 to 10 out of 53 Questions