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Why is a synchronous machine not self starting?
A synchronous generator generally requires DC power supplied to the rotor winding to make it into an electromagnet. As the rotor spins, a voltage will be induced in the stator windings (the stationary windings). A synchronous generator needs something to supply this initial DC power to the rotor, so it may be deemed to not be "self starting". "Self starting" may have several different interpretations, though. A "black start" generator could be deemed as being self starting, even though this initial power is (usually) supplied by a set of batteries. Many generators pull this power from the power grid, so if the grid is not energized (black start conditions), these generators cannot start until at least part of the power grid is put back in service with another generator.
Can we run our heat pump to heat the house even though the compressor is not working?
No. The compressor is needed to run in reverse in order to pull warm air from the outside to heat the home.
Can you operate a synchronous generator as a motor?
Yes. This is called motoring, and is generally a bad thing; instead of producing power, the generator begins to suck in power, which causes a strain to the power system. Many generators employ special protective relays to prevent operation as motors (usually denoted '32', or a directional relay). I believe some generators (specifically hydro units) are intentionally run like a motor (but without load) to provide power factor correction. I can't find my references for this though, and have no direct experience with it.
Why is special equipment and technology needed to explore extreme environments?
because u if u need something than u can get help from it even though some astronauts technology doesn't work.
What materials are needed to build a wind turbine?
The materials that are needed to build a wind turbine are quite basic. You need some PVC sheets, glue (*preferably white*), screws, washers, dowels, magnets, and wire. Its quite simple. ADDED: Note the question does not cover application, just the turbine, though that answer seems to assume it is to rotate an electrical generator. It would also help to have at least some understanding of how to design turbines (and alternators?), and then the tools and skills to cut, shape and join those materials to obtain the desired result. Good Luck though - it would be an interesting, and if successful, satisfying project!
Can a Pakistani go to the US?
Yes - a visa will be needed though
How many wires needed for 220 volts ac though emt?
Two wires are needed for 220 volts.
What physical characteristics does coniferous have?
Conifers are mostly, though not all, evergreen and bear cones.
How you can hide your fingerprints if you needed to?
Wear gloves (still no guarantee, though).
Some native people of Australia have lost many of their cultural characteristics though what process?
Assimilation
What are some characteristics of the Muppets?
Some characteristics of the muppets are crazy, fun, wild (not in an inappropriate way though like Gonzo likes to shoot himself from cannons) and caring.
What GCSE qualifications are needed to do Ecenomics?
to do economics at A-level no prior GCSEs are needed, though maths and business studies would be of benefit.
Can you eat yogurt even though you are diagnosed with hyperthyroidism?
information needed on hyperthyroidism.
Is maths a-level needed to do psychology at university?
no. it is preferred by universities that you have biology though.
Is a space shuttle formed from a plane?
No, it's built from scratch. It shares some characteristics with aeroplanes though.
Why is a synchronous machine not self starting?
A synchronous generator generally requires DC power supplied to the rotor winding to make it into an electromagnet. As the rotor spins, a voltage will be induced in the stator windings (the stationary windings). A synchronous generator needs something to supply this initial DC power to the rotor, so it may be deemed to not be "self starting". "Self starting" may have several different interpretations, though. A "black start" generator could be deemed as being self starting, even though this initial power is (usually) supplied by a set of batteries. Many generators pull this power from the power grid, so if the grid is not energized (black start conditions), these generators cannot start until at least part of the power grid is put back in service with another generator.
What are Characteristics of Juliet with evidence?
Juliet is naive because she married Romeo even though she only knew him for a day.
