MCQs of Earthquake Resistant Design of building (Design of Reinforced Concrete structures - 3160612)

Design of Reinforced Concrete structures (3160612) MCQs

MCQs of Earthquake Resistant Design of building

Showing 31 to 40 out of 90 Questions

31.

Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m and mass of 20 kg?

(a)	12.32 Hz
(b)	4.10 Hz
(c)	6.16 Hz
(d)	None of the above

32.

Which among the following is the fundamental equation of S.H.M.?

(a)	x + (k / m) x =0
(b)	x + ω²x = 0
(c)	x + (k / m)² x =0
(d)	x² + ωx² = 0

33.

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

34.

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.

35.

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

36.

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

37.

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

38.

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)	$\log (\frac{x_{1}}{x_{2}})$

39.

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

40.

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

Showing 31 to 40 out of 90 Questions