its due to intermolecular collision of magnetic domain .nd its also due to magnetostriction ..
Shielded transformer
have seen in the past , fuel pump moan/noise on this make & model / from a ford tech.
transformer
Spacers insulate the transformer tank from the mechanical vibrations of core & the windings.this results in reduced noise emisions.
An isolation transformer (or more commonly, amplifier) reduces noise in the system from the power source. This is especially necessary in medical applications where the signals that are being read are very tiny and even a small amount of noise can disrupt a signal and make it unreadable.
A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.
A car that is in good running condition should not make a clunking noise. If a person pushes the gas and brake pedal at the same time causing a car to make a clunking noise, that is an indication of stain on the motor.
No, this HP laptop should make little to no noise while running with no programs on.
The epoxy resin cast transformer steps up or steps down voltage. The epoxy resin cast transformer generally generate low noise and are very cost efficient. They are also resistant to failure as compared to the other types of transformers.
Loud music or noise.
If the heater blower has humming noise when motor is running, first check its capacitor. If the capacitor is fine, then the motor is the problem and may need to be replaced.
This varies greatly depending on the size, voltage ratings, and application. A generator step up transformer has different requirements over a transformer closer to load centers (may require low noise design, for example). You don't get anything for free, so every demand made for a transformer most likely will result in an increase in the cost.