Dynamics of Machinery (3151911) MCQs

MCQs of Free vibrations and damped free vibrations

Showing 11 to 20 out of 88 Questions
11.

When a body is subjected to transverse vibrations, the stress-induced in a body will be

(a)

shear stress

(b)

bending stress

(c)

compressive stress

(d)

crushing stress

Answer:

Option (b)

12.

The natural frequency (in Hz) of free longitudinal vibrations is equal to

(a)

12πsm

(b)

12πgδ

(c)

0.4985δ

(d)

any one of these

Answer:

Option (d)

13.

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)

x1/x2

(b)

log (x1+x2)

(c)

log (x1/x2)

(d)

log (x1.x2)

Answer:

Option (c)

14.

The equation of motion for a vibrating system with viscous damping is

d2xdt2+cm×dxdt+sm×x=0

If the roots of this equation are real, then the system will be

(a)

over damped

(b)

under damped

(c)

critically damped

Answer:

Option (a)

15.

In under damped vibrating system, the amplitude of vibration

(a)

decreases linearly with time

(b)

decreases exponentially with time

(c)

increases linearly with time

(d)

increases exponentially with time

Answer:

Option (b)

16.

If the damping factor for a vibrating system is unity, then the system will be

(a)

over damped

(b)

under damped

(c)

critically damped

(d)

without vibrations

Answer:

Option (c)

17.

A motion that repeats itself after equal intervals of time is known as ___________ .

(a)

periodic motion

(b)

cycle

(c)

frequency

(d)

isolation

Answer:

Option (a)

18.

The motion completed during one time period is known as _______.

(a)

period of vibration

(b)

cycle

(c)

frequency

(d)

amplitude

Answer:

Option (b)

19.

The time periodic is given by _______.

(a)

ω / 2π

(b)

2π / ω

(c)

2π × ω

(d)

π/ω

Answer:

Option (b)

20.

Frequency is equal to ______.

(a)

time period

(b)

1/time period

(c)

𝜔 x time period

(d)

𝜔/time period

Answer:

Option (b)

Showing 11 to 20 out of 88 Questions