Problem: Electric motor:

The brushless wound-rotor synchronous doubly-fed (BWRSDF) machine is the only electric machine with a truly dual ported transformer circuit topology (i.e., both ports independently excited with no short-circuited port). The dual ported transformer circuit topology is known to be unstable and requires a multiphase slip-ring-brush assembly to propagate limited power to the rotor winding set. If a precision means were available to instantaneously control torque angle and slip for synchronous operation during motoring or generating while simultaneously providing brushless power to the rotor winding set, the active current of the BWRSDF machine would be independent of the reactive impedance of the transformer circuit and bursts of torque significantly higher than the maximum operating torque and far beyond the practical capability of any other type of electric machine would be realizable. Torque bursts greater than eight times operating torque have been calculated.

What is the only device with triple ported transformer circuit topology?
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A: unanswerable


Problem: American Idol employs a panel of judges who critique the contestants' performances. The original judges were record producer and music manager Randy Jackson, pop singer and choreographer Paula Abdul and music executive and manager Simon Cowell. The judging panel for the most recent season consisted of country singer Keith Urban, singer and actress Jennifer Lopez, and jazz singer Harry Connick, Jr. The show was originally hosted by radio personality Ryan Seacrest and comedian Brian Dunkleman, with Seacrest continuing on for the rest of the seasons.
What comedian was an original host on American Idol?
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Answer: Brian Dunkleman


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In September 2003, a military coup was conducted. The military arrested Ialá on the charge of being "unable to solve the problems". After being delayed several times, legislative elections were held in March 2004. A mutiny of military factions in October 2004 resulted in the death of the head of the armed forces and caused widespread unrest.
When did the mutiny of military factions occur?
A: October 2004


Context and question: Bitumen was the nemesis of many artists during the 19th century. Although widely used for a time, it ultimately proved unstable for use in oil painting, especially when mixed with the most common diluents, such as linseed oil, varnish and turpentine. Unless thoroughly diluted, bitumen never fully solidifies and will in time corrupt the other pigments with which it comes into contact. The use of bitumen as a glaze to set in shadow or mixed with other colors to render a darker tone resulted in the eventual deterioration of many paintings, for instance those of Delacroix. Perhaps the most famous example of the destructiveness of bitumen is Théodore Géricault's Raft of the Medusa (1818–1819), where his use of bitumen caused the brilliant colors to degenerate into dark greens and blacks and the paint and canvas to buckle.
Bitumen proved stable for use in what type of painting?
Answer: unanswerable


Question: Marwan was succeeded by his son, Abd al-Malik (685–705), who reconsolidated Umayyad control of the caliphate. The early reign of Abd al-Malik was marked by the revolt of Al-Mukhtar, which was based in Kufa. Al-Mukhtar hoped to elevate Muhammad ibn al-Hanafiyyah, another son of Ali, to the caliphate, although Ibn al-Hanafiyyah himself may have had no connection to the revolt. The troops of al-Mukhtar engaged in battles both with the Umayyads in 686, defeating them at the river Khazir near Mosul, and with Ibn al-Zubayr in 687, at which time the revolt of al-Mukhtar was crushed. In 691, Umayyad troops reconquered Iraq, and in 692 the same army captured Mecca. Ibn al-Zubayr was killed in the attack.
Is there an answer to this question: Who was the father of Muhammad ibn al-Hanafiyyah?

Answer: Ali


Question: In the Kingdom of Holland, the British launched the Walcheren Campaign to open up a second front in the war and to relieve the pressure on the Austrians. The British army only landed at Walcheren on 30 July, by which point the Austrians had already been defeated. The Walcheren Campaign was characterized by little fighting but heavy casualties thanks to the popularly dubbed "Walcheren Fever." Over 4000 British troops were lost in a bungled campaign, and the rest withdrew in December 1809. The main strategic result from the campaign became the delayed political settlement between the French and the Austrians. Emperor Francis wanted to wait and see how the British performed in their theater before entering into negotiations with Napoleon. Once it became apparent that the British were going nowhere, the Austrians agreed to peace talks.
Is there an answer to this question: The Walcheren Campaign was intended to relieve the military pressure on whom?

Answer:
the Austrians