Top 150+ Solved Dynamics of Machinery MCQ Questions Answer
Q. Sound power of a machine whose specified sound power level is 125 dB
a. 3.16 w
b. 4.2w
c. 5w
d. 31.6w
Q. The process of maintaining appropriate noise level without consideringeconomic factors is called as _____
a. noise control
b. noise reduction
c. both a. and b.
d. none of the above
Q. Basic elements of noise control are
a. Source ,Path ,Receiver of noise
b. Amplitude and Frequency
c. Time period
d. A and B both
Q. Main sources of noise pollution are
a. Transportation equipment only
b. Heavy machinery only
c. Musical instruments
d. Transportation equipment and heavy machinery
Q. The sound can travel in air when:
a. Particles of medium travel from one place to another
b. There is no moisture in the atmosphere
c. Disturbance travel from one place to another
d. Both particles as well as disturbance travel from one place to another
Q. White noise is random noise that has a audible frequency rangefrom
a. 320 to 100 KHz
b. 20 to 20KHtz
c. 120 to 20KHtz
d. 220 to 20KHtz
Q. Which among the following has a constant power spectral density over a widefrequency range?
a. White noise
b. Black noise
c. Pink noise
d. Blue noise
Q. Which is correct option for ear protection equipment?
a. Headphone
b. Use of cotton in ears
c. Ear defeders ,Ear plugs
d. All the above
Q. The technique or method to absorb undesirable sounds by soft and porous
a. Acoustic protection
b. Unacoustic protection
c. Audible protection
d. Decibel protection
Q. When sound interacts with materials and boundaries, it displays all the
a. Heat
b. Waves
c. Light
d. Electricity
Q. Soft materials absorb a large amount of
a. Heat energy
b. Light energy
c. Electromagnetic waves
d. Sound energy
Q. Which best describe the sound wave?
a. It may be longitudinal
b. It is always transverse
c. It is always longitudinal
d. All of the above
Q. Which of the following can not travel through a vacuum?
a. Electromagnetic wave
b. Radio wave
c. Sound wave
d. Light wave