Problem: Railway electrification system:

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.

Power conversion for an AC system takes place mainly in a what?
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A: unanswerable


Problem: As there is no research indicating which of the three components is essential in defining sexual orientation, all three are used independently and provide different conclusions regarding sexual orientation. Savin Williams (2006) discusses this issue and notes that by basing findings regarding sexual orientation on a single component, researchers may not actually capture the intended population. For example, if homosexual is defined by same sex behavior, gay virgins are omitted, heterosexuals engaging in same sex behavior for other reasons than preferred sexual arousal are miscounted, and those with same sex attraction who only have opposite-sex relations are excluded. Because of the limited populations that each component captures, consumers of research should be cautious in generalizing these findings.
How are the three component used to determine sexual orientation?
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Answer: all three are used independently and provide different conclusions regarding sexual orientation


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Twilight Princess received the awards for Best Artistic Design, Best Original Score, and Best Use of Sound from IGN for its GameCube version. Both IGN and Nintendo Power gave Twilight Princess the awards for Best Graphics and Best Story. Twilight Princess received Game of the Year awards from GameTrailers, 1UP.com, Electronic Gaming Monthly, Game Informer, Games Radar, GameSpy, Spacey Awards, X-Play and Nintendo Power. It was also given awards for Best Adventure Game from the Game Critics Awards, X-Play, IGN, GameTrailers, 1UP.com, and Nintendo Power. The game was considered the Best Console Game by the Game Critics Awards and GameSpy. The game placed 16th in Official Nintendo Magazine's list of the 100 Greatest Nintendo Games of All Time. IGN ranked the game as the 4th-best Wii game. Nintendo Power ranked the game as the third-best game to be released on a Nintendo system in the 2000s decade.
What was Twilight Princess's rank among all Nintendo games according to Nintendo Magazine?
A: 16th


Context and question: In 885 AD the Armenians reestablished themselves as a sovereign kingdom under the leadership of Ashot I of the Bagratid Dynasty. A considerable portion of the Armenian nobility and peasantry fled the Byzantine occupation of Bagratid Armenia in 1045, and the subsequent invasion of the region by Seljuk Turks in 1064. They settled in large numbers in Cilicia, an Anatolian region where Armenians were already established as a minority since Roman times. In 1080, they founded an independent Armenian Principality then Kingdom of Cilicia, which became the focus of Armenian nationalism. The Armenians developed close social, cultural, military, and religious ties with nearby Crusader States, but eventually succumbed to Mamluk invasions. In the next few centuries, Djenghis Khan, Timurids, and the tribal Turkic federations of the Ak Koyunlu and the Kara Koyunlu ruled over the Armenians.
What did the Seljuk Turks invade in 885 AD?
Answer: unanswerable


Question: Ehrlich’s approach of systematically varying the chemical structure of synthetic compounds and measuring the effects of these changes on biological activity was pursued broadly by industrial scientists, including Bayer scientists Josef Klarer, Fritz Mietzsch, and Gerhard Domagk. This work, also based in the testing of compounds available from the German dye industry, led to the development of Prontosil, the first representative of the sulfonamide class of antibiotics. Compared to arsphenamine, the sulfonamides had a broader spectrum of activity and were far less toxic, rendering them useful for infections caused by pathogens such as streptococci. In 1939, Domagk received the Nobel Prize in Medicine for this discovery. Nonetheless, the dramatic decrease in deaths from infectious diseases that occurred prior to World War II was primarily the result of improved public health measures such as clean water and less crowded housing, and the impact of anti-infective drugs and vaccines was significant mainly after World War II.
Is there an answer to this question: Prontosil is in what drug class?

Answer: antibiotics


Problem: High-definition television:

Additionally, cable-ready TV sets can display HD content without using an external box. They have a QAM tuner built-in and/or a card slot for inserting a CableCARD.

What kind of built-in tuner will allow a cable-ready TV to display HD content without an external box?
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A:
QAM