Answer / avi

NVH,is the study and modification of the noise and
vibration characteristics of vehicles, particularly cars
and trucks. While noise and vibration can be readily
measured, Harshness is a subjective quality, and is
measured either via "jury" evaluations, or with analytical
tools that provide results reflecting human subjective
impressions. These latter tools belong to the field known
as "psychoacoustics."

Answer / deepak

Noise vibration and harshness is related to machinery, sound waves for horn, music system and of course for automobile
If the 0 db then good( No NVH) silence zone
if 10-20 low
if 20-30 moderate
if 30-40 high
if 40-50 very high
above this is not safe for human being, up to 40 is limited for human being

Answer / sundhara narasimhan

0 dB is the auditory threshold at 1 kHz. Frequency between 2kHz and 4kHz is lowest frequency level that is heard by human.

Human perception level is 0 dB.
Hearing damage during long-term effect is approx. 90 dB.
Hearing damage during short-term effect is approx. 120 dB.
Threshold of pain happens at 134 dB.

i had supply in my previous semester but i cleared it now. Now i am also select for a job where there is a provision that they can select me for the job if i clear all the semester till the time of joining . so can my previous supply effect my job?

2 Answers   HCL,

---

What creates speed in centrifugal pump ?

1 Answers   ADNOC Abu Dhabi National Oil Company, Engro,

---

How to check the round duct measurement

0 Answers  

---

What is the weight of 1m3 of seawater?

0 Answers  

---

what is pulverisation

6 Answers   GNFC,

---

---

How does the steam work in a steam turbine?

0 Answers   ABC Inc, RRB, Siemens,

---

for a multi storey building how to control the flow of water in each floors

2 Answers  

---

What are your significant functional achievements in the present company? How did they contribute to the total process

0 Answers  

---

sir, i am going to appear in the test of BEML 2009 so i want to get the type of question paper asked in previous exams of BEML.

0 Answers  

---

• Do you have any blind spots?

1 Answers   Petro Star Mount,

---

What is the name given to ratio of actual cycle efficiency and ideal cycle efficiency?

0 Answers  

---

How can check gear pitch?

0 Answers  

---