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.

Q1 WHY WE CAN NOT PUT GAS KIT IN DIESEL VEHICLE. PLEASE GIVE THE REASON IN DETAIL

1 Answers   Maruti Suzuki,

---

How to calculate motor bearing life - cycle (life time) (SKF bearing) how determine the capacity of refrigeration system? how we use condenser coils, compressor, capillarity,compressor how determine the capacity of refrigeration system? how we use condenser coils, compressor, capillarity,compressor what is rigging

0 Answers  

---

What are the causes if one cylinder in a diesel engine has a high temperature?

0 Answers  

---

what is the difference between dross and scale?

1 Answers   Hindalco,

---

HOW TO CALCULTE THE TR CAPACITY FOR SCREW COMPRESSOR, RECIPROCATING COMPRESSOR,PHE & COOLING TOWER? HOW TO CALCULATE THE FLOW RATING OF PUMPS?

0 Answers   Sanmar,

---

---

What is the weight of 1m3 of seawater?

0 Answers  

---

what is least count of vernier caliper

8 Answers   DRDO, Indo Air, L&T, Nicks,

---

what does the nomenclature for this bearing mean? 3206etvh.c3

1 Answers   Bruce Power,

---

Define nusselt number [nu].

0 Answers  

---

Suppose there are two vessels. One of diameter = D and other vessel dia = d. Suppose in vessel with dia D, water is filled upto height H and vessel with dia d is empty. Now both vessels are connected.Water will flow from D dia vesel to small d dia vessel.Suppose after equilibrium height of water in vessel with dia D is h. How much is h in terms of D, d,H etc?

14 Answers   BARC,

---

How can i Check at site this material is Powder coated CRCA ?

0 Answers   Bouygues Batiment International, Essar,

---

4 stroke engine have how many suctions

1 Answers   Varun Motors,

---