Deck 6: Measuring Vibrations and Sound

Question 1

An accelerometer is an instrument used to measure the _________ of a vibrating body.

A)displacement
B)velocity
C)acceleration
D)all of the above

Answer 1

acceleration

Question 2

Stroboscope is used for the measurement of _________________?

A)Rpm of a flywheel
B)Frequency of light
C)Depression of freezing point
D)Liquid level under pressure

Answer 2

Rpm of a flywheel

Question 3

A seismometer is a device used to measure the ___________ of a vibrating body.

A)displacement
B)velocity
C)acceleration
D)all of the above

Answer 3

displacement

Question 4

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 above

Question 5

The accelerometer is used as a transducer to measure earthquake in Richter scale. Its design is based on the principle that ______.

A)its natural frequency is very low in comparison to the frequency of vibration
B)its natural frequency is very high in comparison to the frequency of vibration
C)its natural frequency is equal to the frequency of vibration
D)measurement of vibratory motion is without any reference point

Question 6

Which of the following instruments measure the amplitude of a vibrating body?

A)Vibrometers
B)Seismometer
C)Both (a) and (b)
D)None of these

Question 7

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

A)Coupled machine
B)Uncoupled machine
C)Balanced machine
D)Unbalanced machine

Question 8

What does the accelerometer measure?

A)Mass
B)Acceleration
C)Velocity
D)Distance

Question 9

Which of the following device can be used for measurement of frequency?

A)Voltmeter
B)Ammeter
C)Stroboscope
D)None of the mentioned

Question 10

Which of the following is correct regarding isolation factor?

A)Dimensionless quantity
B)Has Newton as its unit
C)Has joule as its Unit
D)Has Hz as its unit

Question 11

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)Infinity

Question 12

Which part of human ear converts sound vibrations into electrical signals

A)Hammer
B)Stirrup
C)Tympanic membrane
D)Cochlea

Question 13

Sound is measured by units that are called

A)Hertz (Hz)
B)Decibels (dB)
C)Meters (m)
D)Pascal (Pa)

Question 14

'Eardrum' bursts at

A)40 dB
B)80 dB
C)160 dB
D)320 dB

Question 15

The loudness of sound varies directly with the vibrating body's

A)Intensity
B)Amplitude
C)Pitch
D)Quality

Question 16

The scale to measure the intensity level of sound is called

A)Vector scale
B)Measuring ruler
C)Bel scale
D)decibel scale

Question 17

Pitch of the sound depends upon

A)Frequency
B)Distance of sound
C)Amplitude
D)Temperature

Question 18

Following scale is used for loudness of sound or noise

A)Linear scale
B)Logarithmic scale
C)Exponential scale
D)None of the above

Question 19

Sound Intensity is given by.

A)I=w/s
B)I=s/w
C)w=I/s
D)s=w/I

Question 20

Unit for Reference sound intensity is_________.

A)W/m2
B)W/mm3
C)W/cm3
D)None of the above

Question 21

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

Question 22

The process of maintaining appropriate noise level without considering economic factors is called as _____

A)noise control
B)noise reduction
C)both a. and b.
D)none of the above

Question 23

Basic elements of noise control are

A)Source ,Path ,Receiver of noise
B)Amplitude and Frequency
C)Time period
D)A and B both

Question 24

All sound is noise.