Noise and Vibration

What is the correct action to diagnose the noise and vibration at first?

• To understand the customer complaint precisely.

• To start the repair work just hearing the customer complaint.

• To start the repair work based on previous experience.

What is the frequency of cavity resonance where the vehicle is in medium speed (40-100km/h)?

• 30-60 Hz

• 60-100 Hz

• 100-200 Hz

What is the benefit of Decibel (dB) for the noise and vibration measurement unit?

(multiple answers)

• It is similar to human feelings.

• The measurement value is shown on small number.

• It is easy to compare even big order difference numbers.

Which tools can measure the frequency of vibration?

• Sirometer

• Non-contact tachometer

• FFT analyser with vibration sensor

What does non contact tachometer measure?

• Ferquency of noise

• Find the location of the air leakage

• The rotational speed of an object

How many classifications exist on the noise and vibration sensitive ?

• 1

• 2

• 3

• 4

How many types of the gear noise exists on the vehicle?

• 1

• 2

• 3

• 4

What is the difference between an FF and FR model ?

• The position of wheel drive

• The position of engine

• The position of conductor

Which one of these issues does NOT correspond to a concern of “take-off vibration” ?

• Take off vibration can be observed on floor panel

• Take off vibration can be observed on engine

• Take off vibration can be observed on steering wheel

• Take off vibration can be observed on front seat

Which order of vibration is the potential cause of the noise and vibraiton?

• 2nd

• 3rd

• 4th

• Any