Dynamics of Machinery (3151911) MCQs

MCQs of Forced damped vibrations

Showing 11 to 20 out of 45 Questions
11.

Which of the following is a type of transmitted force to the foundation?

(a)

Damping force

(b)

Undamping force

(c)

Tensile force

(d)

Torsional force

Answer:

Option (a)

12.

Which of the following systems produce a vibration in the foundation?

(a)

Coupled machine

(b)

Uncoupled machine

(c)

Balanced machine

(d)

Unbalanced machine

Answer:

Option (d)

13.

When a periodic disturbing force is applied to a machine, the force is transmitted to the ___________ by the means of spring.

(a)

dampers

(b)

foundation

(c)

mass

(d)

none of the mentioned

Answer:

Option (b)

14.

Which of the following is a unit of isolation factor?

(a)

Newton

(b)

Joule

(c)

Hz

(d)

None of the mentioned

Answer:

Option (d)

15.

If the isolation factor is negative, then what is the phase difference between transmitted and disturbing force?

(a)

90°

(b)

180°

(c)

360°

(d)

720°

Answer:

Option (b)

16.

If the damper is not provided and the system is in resonance, which of the following is the correct isolation factor?

(a)

0

(b)

0.5

(c)

0.25

(d)

Infinite

Answer:

Option (d)

17.

In a vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is _______ degree.

(a)

0

(b)

90

(c)

180

(d)

270

Answer:

Option (c)

18.

In a vibration isolation system, if ω/ωn is less than 2 , then for all values of the damping factor, the transmissibility will be

(a)

less than unity

(b)

equal to unity

(c)

greater than unity

(d)

zero

Answer:

Option (c)

19.

For an underdamped harmonic oscillator, resonance ______.

(a)

occurs when excitation frequency is greater than the undamped natural frequency

(b)

occurs when excitation frequency is less than the undamped natural frequency

(c)

occurs when excitation frequency is equal to the undamped natural frequency

(d)

never occurs

Answer:

Option (c)

20.

The instruments which are used to measure the ___________ of a vibrating body are called vibration measuring instrument.

(a)

displacement

(b)

velocity

(c)

acceleration

(d)

all of the mentioned

Answer:

Option (d)

Showing 11 to 20 out of 45 Questions