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Manifold vacuum can be used to drive accessories on automobiles. The best-known application is the vacuum servo, used to provide power assistance for the brakes. Obsolete applications include vacuum-driven windscreen wipers and Autovac fuel pumps. Some aircraft instruments (Attitude Indicator (AI) and the Heading Indicator (HI)) are typically vacuum-powered, as protection against loss of all (electrically powered) instruments, since early aircraft often did not have electrical systems, and since there are two readily available sources of vacuum on a moving aircraftthe engine and an external venturi. Vacuum induction melting uses electromagnetic induction within a vacuum.
What are two available sources of vacuum on a moving airplane?
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The answer: engine and an external venturi

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The emperor Julian made a short-lived attempt to revive traditional and Hellenistic religion and to affirm the special status of Judaism, but in 380 under Theodosius I, Nicene Christianity became the official state religion of the Roman Empire. Pleas for religious tolerance from traditionalists such as the senator Symmachus (d. 402) were rejected. Christianity became increasingly popular. Heretics as well as non-Christians were subject to exclusion from public life or persecution, but Rome's original religious hierarchy and many aspects of its ritual influenced Christian forms, and many pre-Christian beliefs and practices survived in Christian festivals and local traditions.
What pleas were rejected by the empire?
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The answer: religious tolerance

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GE's history of working with turbines in the power-generation field gave them the engineering know-how to move into the new field of aircraft turbosuperchargers.[citation needed] Led by Sanford Alexander Moss, GE introduced the first superchargers during World War I, and continued to develop them during the Interwar period. Superchargers became indispensable in the years immediately prior to World War II, and GE was the world leader in exhaust-driven supercharging when the war started. This experience, in turn, made GE a natural selection to develop the Whittle W.1 jet engine that was demonstrated in the United States in 1941. GE ranked ninth among United States corporations in the value of wartime production contracts. Although their early work with Whittle's designs was later handed to Allison Engine Company, GE Aviation emerged as one of the world's largest engine manufacturers, second only to the British company, Rolls-Royce plc.
What was GE's rank among US corporations in the value of wartime production contracts during World War II?
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The answer: ninth

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After the disappointment of the Gaspart era, the combination of a new young president, Joan Laporta, and a young new manager, former Dutch and Milan star Frank Rijkaard, saw the club bounce back. On the field, an influx of international players, including Ronaldinho, Deco, Henrik Larsson, Ludovic Giuly, Samuel Eto'o, and Rafael Marquez, combined with home grown Spanish players, such as Carles Puyol, Andres Iniesta, Xavi and Victor Valdes, led to the club's return to success. Barcelona won La Liga and the Supercopa de Espana in 200405, and Ronaldinho and Eto'o were voted first and third, respectively, in the FIFA World Player of the Year awards.
What season did Barcelona win La Liga and Supercopa de Espana?
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The answer:
200405