What do you mean by ballast on a ship?

1 : a heavy substance (such as rocks or water) placed in such a way as to improve stability and control (as of the draft of a ship or the buoyancy of a balloon or submarine) tossed several tons of ballast overboard.

Can a dimming ballast be used with a rapid start ballast?

Dimmable ballast. A dimmable ballast is very similar to a rapid start ballast, but usually has a capacitor incorporated to give a power factor nearer to unity than a standard rapid start ballast. A quadrac type light dimmer can be used with a dimming ballast, which maintains the heating current while allowing lamp current to be controlled.

What kind of ballast does a railroad use?

gravel, broken stone, slag, etc., placed between and under the ties of a railroad to give stability, provide drainage, and distribute loads. Electricity. Also called ballast resistor. a device, often a resistor, that maintains the current in a circuit at a constant value by varying its resistance in order to counteract changes in voltage.

Why are reactive ballasts used in autotransformers?

The autotransformer is designed with enough leakage inductance ( short-circuit inductance) so that the current is appropriately limited. Because of the large inductors and capacitors that must be used, reactive ballasts operated at line frequency tend to be large and heavy. They commonly also produce acoustic noise (line-frequency hum ).

Which is the correct translation of the word ballast?

1. (of road) empierrement 2. (of railway) ballast ; plate n. You want to reject this entry: please give us your comments (bad translation/definition, duplicate entries…) To add entries to your own vocabulary, become a member of Reverso community or login if you are already a member. It’s easy and only takes a few seconds:

What are the requirements of the ballast water convention?

The Convention will require all ships to implement a Ballast Water and Sediments Management Plan. All ships will have to carry a Ballast Water Record Book and will be required to carry out ballast water management procedures to a given standard. Existing ships will be required to do the same, but after a phase-in period.

Why is ballast water bad for the environment?

Ballast water taken into a tank from one body of water and discharged in another body of water can introduce invasive species of aquatic life. The taking in of water from ballast tanks has been responsible for the introduction of species that cause environmental and economic damage.