Modern electrification systems take AC energy from a power grid which is delivered to a locomotive and converted to a DC voltage to be used by traction motors. These motors may either be DC motors which directly use the DC or they may be 3-phase AC motors which require further conversion of the DC to 3-phase AC (using power electronics). Thus both systems are faced with the same task: converting and transporting high-voltage AC from the power grid to low-voltage DC in the locomotive. Where should this conversion take place and at what voltage and current (AC or DC) should the power flow to the locomotive? And how does all this relate to energy-efficiency? Both the transmission and conversion of electric energy involve losses: ohmic losses in wires and power electronics, magnetic field losses in transformers and smoothing reactors (inductors). Power conversion for a DC system takes place mainly in a railway substation where large, heavy, and more efficient hardware can be used as compared to an AC system where conversion takes place aboard the locomotive where space is limited and losses are significantly higher. Also, the energy used to blow air to cool transformers, power electronics (including rectifiers), and other conversion hardware must be accounted for.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): 4-phase AC motors require further what?
Ah, so.. unanswerable

The scope of the term "post-punk" has been subject to controversy. While some critics, such as AllMusic's Stephen Thomas Erlewine, have employed the term "post-punk" to denote "a more adventurous and arty form of punk", others have suggested it pertains to a set of artistic sensibilities and approaches rather than any unifying style. Music journalist and post-punk scholar Simon Reynolds has advocated that post-punk be conceived as "less a genre of music than a space of possibility", suggesting that "what unites all this activity is a set of open-ended imperatives: innovation; willful oddness; the willful jettisoning of all things precedented or 'rock'n'roll'". Nicholas Lezard, problematizing the categorization of post-punk as a genre, described the movement as "so multifarious that only the broadest use of the term is possible".
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Why is only the broadest use of genre possible when trying to categorize what actually defines post-punk?
Ah, so.. multifarious

Raleigh is located in the northeast central region of North Carolina, where the Piedmont and Atlantic Coastal Plain regions meet. This area is known as the "fall line" because it marks the elevation inland at which waterfalls begin to appear in creeks and rivers. As a result, most of Raleigh features gently rolling hills that slope eastward toward the state's flat coastal plain. Its central Piedmont location situates Raleigh about two hours west of Atlantic Beach, North Carolina, by car and four hours east of the Great Smoky Mountains. The city is 155 miles (249 km) south of Richmond, Virginia, 263 miles (423 km) south of Washington, D.C., and 150 miles (240 km) northeast of Charlotte, North Carolina.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What type of geography is in Raleigh?
Ah, so..
gently rolling hills that slope eastward toward the state's flat coastal plain.