Question: Besides increased efficiency of power plants, there was an increase in efficiency (between 1950 and 1973) of the railway utilization of this electricity with energy-intensity dropping from 218 to 124 kwh/10,000 gross tonne-km (of both passenger and freight trains) or a 43% drop. Since energy-intensity is the inverse of energy-efficiency it drops as efficiency goes up. But most of this 43% decrease in energy-intensity also benefited diesel traction. The conversion of wheel bearings from plain to roller, increase of train weight, converting single track lines to double track (or partially double track), and the elimination of obsolete 2-axle freight cars increased the energy-efficiency of all types of traction: electric, diesel, and steam. However, there remained a 12–15% reduction of energy-intensity that only benefited electric traction (and not diesel). This was due to improvements in locomotives, more widespread use of regenerative braking (which in 1989 recycled 2.65% of the electric energy used for traction,) remote control of substations, better handling of the locomotive by the locomotive crew, and improvements in automation. Thus the overall efficiency of electric traction as compared to diesel more than doubled between 1950 and the mid-1970s in the Soviet Union. But after 1974 (thru 1980) there was no improvement in energy-intensity (wh/tonne-km) in part due to increasing speeds of passenger and freight trains.
Is there an answer to this question: The overall efficiency of electric traction tripled during what years?

Answer: unanswerable


Question: Executive authority is vested in the Queen, who is represented in the territory by the Governor of Saint Helena. As the Governor resides permanently in Saint Helena, an Administrator is appointed to represent the Governor in the islands. The Administrator is a career civil servant in the Foreign Office and is selected by London. Since 1998, each Administrator has served a single, three-year term (which begins in September, upon arrival of the supply ship from Cape Town.) The Administrator acts as the local head of government, and takes advice from the Tristan da Cunha Island Council. Alex Mitham was appointed Tristan da Cunha’s 22nd Administrator and arrived, with his wife Hasene, to take over from Sean Burns in September 2013. The Island Council is made up of eight elected and three appointed members, who serve a 3-year term which begins in February (or March).
Is there an answer to this question: When did Sean Burns arrive to takeover from Alex Mitham?

Answer: unanswerable


Question: As the capital of Uruguay, Montevideo is the economic and political centre of the country. Most of the largest and wealthiest businesses in Uruguay have their headquarters in the city. Since the 1990s the city has undergone rapid economic development and modernization, including two of Uruguay's most important buildings—the World Trade Center Montevideo (1998), and Telecommunications Tower (2000), the headquarters of Uruguay's government-owned telecommunications company ANTEL, increasing the city's integration into the global marketplace.
Is there an answer to this question: What year was the Telecommunications Tower constructed?

Answer: (2000


Question: The Russian Soviet Federative Socialist Republic (Russian SFSR or RSFSR; Russian: Российская Советская Федеративная Социалистическая Республика, tr. Rossiyskaya Sovetskaya Federativnaya Sotsialisticheskaya Respublika  listen (help·info)) commonly referred to as Soviet Russia or simply as Russia, was a sovereign state in 1917–22, the largest, most populous, and most economically developed republic of the Soviet Union in 1922–91 and a sovereign part of the Soviet Union with its own legislation in 1990–91. The Republic comprised sixteen autonomous republics, five autonomous oblasts, ten autonomous okrugs, six krais, and forty oblasts. Russians formed the largest ethnic group. To the west it bordered Finland, Norway and Poland; and to the south, China, Mongolia and North Korea whilst bordering the Arctic Ocean to the north, the Pacific Ocean to the east and the Black sea and Caspian Sea to the south. Within the USSR, it bordered the Baltic republics (Lithuania, Latvia and Estonia), the Byelorussian SSR and the Ukrainian SSR to the west. To the south it bordered the Georgian, Azerbaijan and Kazakh SSRs.
Is there an answer to this question: When did the RSFSR cease to be a part of the Soviet Union?

Answer:
91