Linear & switching mode power regulators and Passive harmonics filter

[hjkklm]

Electrical Engineering problems!

Linear & switching mode power regulators:

1. What is the major weakness of a Buck Regulator that compared with a Linear Regulator?

Is't efficiency?


Passive harmonics filter:

1. If the filter reactance for harmonics is a negative value, what is the meaning behind that?

Relation to direction?

2. Passive filter can provide certain capacitive compensation to the ac traction power system. However, when there is off-peak hour, very few trains running in the system. Any problem will introduced by the filter?

Energy saving?

Thanks.

 

[rude man]

Electrical Engineering problems!

Linear & switching mode power regulators:

1. What is the major weakness of a Buck Regulator that compared with a Linear Regulator?

Is't efficiency?

.

No. Quite the opposite.

The rest I don't understand.

 

[hjkklm]

.

No. Quite the opposite.

The rest I don't understand.

Thanks.
I don't understand too.
Anyone who can help me?