Coaching Materials in Acoustics Part 1 | ECE Board Exam

Print Friendly, PDF & Email
(Last Updated On: February 10, 2020)

Coaching Materials in Acoustics

This is the Coaching materials in Acoustics Part 1 as one topic in ECE Board Exam taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies (EST), Communications Books, Journals and other Communications References. This particular Coaching Notes in Communications Engineering has random Questions and Answers in random topics. Make sure to familiarize this review notes to increase the chance of passing the ECE Board Exam.

Acoustics Coaching Materials Part 1

1. A vibration in an elastic medium to which the sense of hearing is responsive.


2. Pertaining to signals, equipment or devices that involve frequencies within the human hearing range.


3. Method of expressing amplitude of complex non-periodic signal such as speech.


4. In measuring intelligibility of sound, the number of recorded syllables as a percentage of number transmitted is termed as the

articulation efficiency

5. Generally used as the measure of the amplitude of the sound wave.

Sound pressure

6. A simple sound whose instantaneous waveform is that of a sine wave.

Pure tone

7. Sound reduction index is also called

transmission loss

8. Ability of sound to inhibit the perception of another sound


9. If the pressure component of the sound wave is in the form of a sine wave, its associated velocity component would take a

cosine wave

10. In acoustics, the amplitude of the pressure component is a function of the ______ of the medium.

young’s modulus

11. In acoustics, the volume velocity of the component is a function of the _____ of the material.


12. Complex number equal to the ratio of complex pressure amplitude to the complex amplitude of the volume velocity

acoustic impedance

13. Acoustic energy flowing per unit area and per unit time

acoustic intensity

14. What is the approximate acoustic impedance for a wave in air at 20deg Celsius?


15. What is the speed of sound in water having a density of 1000 kg/m^3 and a Young’s modulus of 2.3×10^9N/m^2


Coaching Materials in Acoustics Part 1 | ECE Board Exam

16. Calculate the wavelength of sound wave in sea water whose frequency is 100 kHz at 25 degrees C?


17. If the wavelength of sound is 3.5cm in sea water, calculate its frequency. 43kHz

18. What is the speed of sound in air at 25deg C?


Coaching Materials in Acoustics Part 1 | ECE Board Exam

19. The velocity of sound in dry air medium is 331.45 m/s. Calculate the new velocity if there is an increase of temperature equal to 10 degrees centigrade.

337.52 m/s

20. Speed of sound is 1000ft/s, what frequency has a wavelength of 24 inches?

500 Hz.

21. What do you call of the several sound sources which are related to each other?

Correlated sound sources

22. If several sounds come from several unrelated sources, the sources are called

uncorrelated sound sources

23. If sounds are produced from three loudspeakers which are driven from a single source (i.e. amplifier), the speakers are considered as

correlated sound source

24. Sound sources that are coming from different instruments are called


25. If a sound receiver receives two sound waves, one directly from the source and the other from simple reflection (with short delay), the sound waves are considered as


26. If a sound receiver receives two sound waves, one directly from the source and the other from a long relay deflection, the sound waves are considered


27. The sound at a particular point consist of a direct wave and a reflection with the same amplitude (P) but has been delayed by 1 ms. If the sound frequency is 1kHz, calculate the pressure amplitude in terms of P at this point.


Coaching Materials in Acoustics Part 1 | ECE Board Exam

28. Calculate the total signal pressure level when two vocalists sing at the same pressure level of 1×10^-3 Pa each.

1.41×10^-3 Pa.

Coaching Materials in Acoustics Part 1 | ECE Board Exam

29. Frequency range of audible signal is

30. 20Hz-20kHz.

31. What is the normal audible range of the human ear?

20 Hz to 20kHz.

32. Audible sound that can be detected by human ear ranges from

16Hz to 16kHz.

33. Very low frequency or very low amplitude sounds.


34. Very high frequency sounds or very high amplitude sounds


35. Signals having frequencies below the range of human hearing


36. Signals with frequencies above the range of human hearing


37. The wavelength of a 20 Hz sound propagating in air at 25 degC is


38. The increase in level for uncorrelated sound sources of equal amplitudes is proportional to the

square root of the number of sound sources,

39. The sound intensity is

inversely proportional to the square of the distance.

40. As sound propagates from the source, its intensity follows an

inverse square law.

41. Measure of sound intensity in comparison to another sound intensity.


42. A measure of the power density of a sound wave propagating in a particular direction


43. Is a measure of the total power radiated in all directions by a source of sound.


44. It is also known as sound power level.


45. Acoustic impedance is _____ the sound pressure.

directly proportional to the square of

Complete List of Communications Engineering Coaching Materials

Important List of Communications Engineering Materials

Print Friendly, PDF & Email
Help Me Makes a Difference!

P inoyBIX educates thousands of reviewers/students a day in preparation for their board examinations. Also provides professionals with materials for their lectures and practice exams. Help me go forward with the same spirit.

“Will you make a small $5 gift today?”

Add Comment

© 2014 PinoyBIX Engineering. © 2019 All Rights Reserved | How to Donate? | Follow me on Blogarama Protection Status
Do NOT follow this link or you will be banned from the site!

Math Solution

Advanced Math problem age work mixture digit motion Analytic Geometry 01 problem Analytic Geometry 02 problem clock variation progression misc Combination problem Differential Calculus 01 Problem Differential Calculus 02 Problem Differential Equations Problem Fundamentals in Algebra Fundamentals in Algebra Problem Integral Calculus problem Permutation problem Plane Geometry problem Plane Trigonometry problem Probability problem quadratic equation binomial theorem logarithms Solid Geometry problem Spherical Trigonometry problem System of Numbers Problem Venn Diagram Problem

Questions and Answers in Mathematics

Advanced Math Age Work Mixture Digit Motion Algebra and General Mathematics Analytic Geometry 01 Analytic Geometry 02 Calculus Clock Variation Progression Misc Differential Calculus 01 Differential Calculus 02 Differential Equations Engineering Mathematics Geometry Integral Calculus Plane Geometry Plane Trigonometry Probability and Statistics Quadratic Equation Binomial Theorem Logarithms Solid Geometry Spherical Trigonometry System of Numbers Trigonometry


Pre-board in Electronics Engineering

Pre-board in Electronics Engineering - Answers

Questions and Answers

Basic Television - Grob TV Boylestad Questions and Answers Computer Principles Electrical Circuit Electricity and Magnetism Fundamentals Electronic Circuits Floyd Questions and Answers Floyd Self-test Grob Questions and Answers Industrial Electronics Principles and Applications Malvino Questions and Answers Microelectronics Power Generators / Sources / Principles and Applications Solid State Devices Tests and Measurements Vacuum Tubes

Pre-board in Communications Engineering

Pre-board in Communications Engineering Pre-board in Communications Engineering - Answers

Questions and Answers

Acoustics Antennas Blake Questions and Answers Broadcasting and Cable TV System Digital Communication Networks Forouzan Frenzel Self-test Kennedy Questions and Answers Microwave Communications Miscellaneous Questions in Communications Modulation Navigational Aids and Radar Systems Noise Optical Fiber Communications Radiation and Wave Propagation Satellite Communications Transmission Fundamentals Wire and Wireless Communications

GEAS Solution

Dynamics problem Economics problem Physics problem Statics problem Strength problem Thermodynamics problem

Pre-board in GEAS

Questions and Answers in GEAS

Engineering Economics Engineering Laws and Ethics Engineering Management Engineering Materials Engineering Mechanics General Chemistry Physics Strength of Materials Thermodynamics
Online Tool: Electrical Charge Conversions
Online Tool: Electrical Charge Conversions
Online Tool: Color Code Conversions
Online Tool: Color Code Conversions
Online Tool: Weight Measurement Conversions
Online Tool: Weight Measurement Conversions
Online Tool: Temperature Measurement Conversions
Online Tool: Temperature Measurement Conversions
Consider Simple Act of Caring!: LIKE MY FB PAGE

Our app is now available on Google Play, Pinoybix Elex

Get it on Google Play