MCQ Questions and Answers on Dynamics of Machinery

Q.

The number of natural frequencies in case of cantilever beam is

A. infinite

B. 1

C. 2

D. 3

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

The main properties of a vibrating system are

A. Mass and stiffness

B. Mass, stiffness and damper

C. Stiffness and damper

D. None of these

Discuss

Answer : Option:- B

Explanation :

Vibrating system is characterised by mass, stiffness and damping.

Q.

To measure the displacement what is used

A. Vibrometer

B. Accelerometer

C. Velometer

D. Frequency meter

Discuss

Answer : Option:- A

Explanation :

Vibrometer is used to measure displacement.

Q.

Force required to produce unit displacement is

A. Amplitude

B. Frequency

C. Time period

D. Stiffness

Discuss

Answer : Option:- D

Explanation :

The relation between force and displacement in vibrating system :
F=K * x
Thus, we can say stiffness is force per unit displacement.

Q.

Balancing of a rigid rotor can be achieved by appropriately placing balancing weights in

A. single plane

B. two plane

C. three planes

D. four planes

Discuss

Answer : Option:- B

Explanation :

In order to balance rigid rotor we need to place balancing weight in 2 planes.

Q.

If the polar moment of inertia is increased to four times, then what will be the effect on free torsional vibrations of a single rotor system?

A. Increases 4 times

B. Increases 2 times

C. Decreases 4 times

D. Decreases 2 times

Discuss

Answer : Option:- B

Explanation :

In case of torsional vibration,
Fn=(1/2π) * √(GJ / IL)
Where J is polar moment of inertia. Therefore we can say vibration frequency depends on square root of polar moment of inertia. Hence it will increase 2 times.

Q.

How many differential equations are written for two degree of freedom system

A. One

B. Two

C. Three

D. Four

Discuss

Answer : Option:- B

Explanation :

In case of two degree of freedom system 2 equation of motion needed.

Q.

What is used to measure the velocity component

A. Vibrometer

B. accelerometer

C. velometer

D. frequency meter

Discuss

Answer : Option:- C

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

Noise that is produced by combining sounds of all different frequencies together within the range of human hearing is called as

A. Sound pressure level

B. White Noise

C. Pure tone

D. Sound intensity

Discuss

Answer : Option:- B

Explanation :

White noise is produced by combining sounds of all different frequencies together within the range of human hearing.

Q.

When the amplitude of vibration of the main system, while operating at at its original resonant frequency becomes zero, then it is called as ______ absorber.

A. tunned

B. untunned

C. uncontrolled

D. None of the above

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

MCQ Questions and Answers on Dynamics of Machinery

Q. The number of natural frequencies in case of cantilever beam is

Q. The main properties of a vibrating system are

Q. To measure the displacement what is used

Q. Force required to produce unit displacement is

Q. Balancing of a rigid rotor can be achieved by appropriately placing balancing weights in

Q. If the polar moment of inertia is increased to four times, then what will be the effect on free torsional vibrations of a single rotor system?

Q. How many differential equations are written for two degree of freedom system

Q. What is used to measure the velocity component

Q. Noise that is produced by combining sounds of all different frequencies together within the range of human hearing is called as

Q. When the amplitude of vibration of the main system, while operating at at its original resonant frequency becomes zero, then it is called as ______ absorber.

Q.

The number of natural frequencies in case of cantilever beam is

Q.

The main properties of a vibrating system are

Q.

To measure the displacement what is used

Q.

Force required to produce unit displacement is

Q.

Balancing of a rigid rotor can be achieved by appropriately placing balancing weights in

Q.

If the polar moment of inertia is increased to four times, then what will be the effect on free torsional vibrations of a single rotor system?

Q.

How many differential equations are written for two degree of freedom system

Q.

What is used to measure the velocity component

Q.

Noise that is produced by combining sounds of all different frequencies together within the range of human hearing is called as

Q.

When the amplitude of vibration of the main system, while operating at at its original resonant frequency becomes zero, then it is called as ______ absorber.