McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 151. |
Main sources of noise pollution are |
| A. | Transportation equipment only |
| B. | Heavy machinery only |
| C. | Musical instruments |
| D. | Transportation equipment and heavy machinery |
| Answer» D. Transportation equipment and heavy machinery | |
| 152. |
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 |
| Answer» C. Disturbance travel from one place to another | |
| 153. |
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 |
| Answer» B. 20 to 20KHtz | |
| 154. |
Which among the following has a constant power spectral density over a wide frequency range? |
| A. | White noise |
| B. | Black noise |
| C. | Pink noise |
| D. | Blue noise |
| Answer» A. White noise | |
| 155. |
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 |
| Answer» C. Ear defeders ,Ear plugs | |
| 156. |
The technique or method to absorb undesirable sounds by soft and porous |
| A. | Acoustic protection |
| B. | Unacoustic protection |
| C. | Audible protection |
| D. | Decibel protection |
| Answer» A. Acoustic protection | |
| 157. |
When sound interacts with materials and boundaries, it displays all the |
| A. | Heat |
| B. | Waves |
| C. | Light |
| D. | Electricity |
| Answer» B. Waves | |
| 158. |
Soft materials absorb a large amount of |
| A. | Heat energy |
| B. | Light energy |
| C. | Electromagnetic waves |
| D. | Sound energy |
| Answer» D. Sound energy | |
| 159. |
Reflection coefficient (Γ) is the rario of intensity of sound ______________. |
| A. | Reflected / Incident. |
| B. | Incident / Reflected. |
| C. | Absorbed / Reflected. |
| D. | None of the above. |
| Answer» A. Reflected / Incident. | |
| 160. |
Absorption coefficient (α) is the rario of intensity of sound ______________. |
| A. | Absorbed / Incident. |
| B. | Incident / Reflected. |
| C. | Absorbed / Incident. |
| D. | None of the above. |
| Answer» C. Absorbed / Incident. | |
| 161. |
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 |
| Answer» C. It is always longitudinal | |
| 162. |
Which of the following can not travel through a vacuum? |
| A. | Electromagnetic wave |
| B. | Radio wave |
| C. | Sound wave |
| D. | Light wave |
| Answer» C. Sound wave | |
| 163. |
Through which medium does sound travel fastest? |
| A. | Air |
| B. | Steel |
| C. | Water |
| D. | Mercury |
| Answer» B. Steel | |
| 164. |
Sound wave has two main characteristics which are |
| A. | Pitch and loudness |
| B. | Tone and loudness |
| C. | Highness and loudness |
| D. | Rarefaction and compression |
| Answer» A. Pitch and loudness | |
| 165. |
When waves bend away from straight lines of travel, it is called |
| A. | Reflection |
| B. | Diffraction |
| C. | Rarefaction |
| D. | Refraction |
| Answer» D. Refraction | |
| 166. |
_________ is the sound power measured over the area upon which is received. |
| A. | Sound pressure |
| B. | Sound energy |
| C. | Sound intensity |
| D. | Sound pressure level |
| Answer» C. Sound intensity | |
| 167. |
It is an audio transducer that converts acoustic pressure in air into its equivalent electrical impulses |
| A. | Loudspeaker |
| B. | Amplifier |
| C. | Baffle |
| D. | Microphone |
| Answer» D. Microphone | |
| 168. |
_________ is a pressure type microphone with permanent coil as a transducing element. |
| A. | Dynamic |
| B. | Condenser |
| C. | Magnetic |
| D. | Carbon |
| Answer» A. Dynamic | |
| 169. |
A capacitor stores energy in the form of an electrostatic field is a ______. |
| A. | Dynamic Microphone |
| B. | Condenser Microphone |
| C. | Magnetic Microphone |
| D. | Carbon Microphone |
| Answer» B. Condenser Microphone | |
| 170. |
A microphone that uses the piezoelectric effect |
| A. | Dynamic |
| B. | Condenser |
| C. | Crystal |
| D. | Carbon |
| Answer» C. Crystal | |
| 171. |
It describes the output of a microphone over a range of frequencies. |
| A. | Directivity |
| B. | Sensitivity |
| C. | Frequency response |
| D. | All of the above |
| Answer» C. Frequency response | |
| 172. |
The most important terms that are used to describe the sound field around a sound emitting object |
| A. | Far , Near Field |
| B. | Free ,Diffuse Field |
| C. | A and B both |
| D. | None of the above |
| Answer» C. A and B both | |
| 173. |
The sound waves behave in a much more complex fashion, and there is no fixed relationship between ________________. |
| A. | Sound pressure |
| B. | pressure and distance |
| C. | Sound energy |
| D. | Sound intensity |
| Answer» B. pressure and distance | |
| 174. |
The sound far field is beginning at a distance of ____________ . |
| A. | pressure and distance |
| B. | Sound energy |
| C. | Sound pressure |
| D. | 2 wavelengths away from the sound source |
| Answer» D. 2 wavelengths away from the sound source | |
| 175. |
Measurement of noise can be made in following environment ____________ |
| A. | Anechoic Chamber |
| B. | Semi - anechoic Chamber |
| C. | Reverberant Chamber |
| D. | All the above |
| Answer» D. All the above | |
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