Article: A Yagi-Uda array uses passive elements to greatly increase gain. It is built along a support boom that is pointed toward the signal, and thus sees no induced signal and does not contribute to the antenna's operation. The end closer to the source is referred to as the front. Near the rear is a single active element, typically a half-wave dipole or folded dipole. Passive elements are arranged in front (directors) and behind (reflectors) the active element along the boom. The Yagi has the inherent quality that it becomes increasingly directional, and thus has higher gain, as the number of elements increases. However, this also makes it increasingly sensitive to changes in frequency; if the signal frequency changes, not only does the active element receive less energy directly, but all of the passive elements adding to that signal also decrease their output as well and their signals no longer reach the active element in-phase.

Question: What can take advantage of these elements to add more gain?
Ans: Yagi-Uda array


Article: Melbourne has the largest Greek-speaking population outside of Europe, a population comparable to some larger Greek cities like Larissa and Volos. Thessaloniki is Melbourne's Greek sister city. The Vietnamese surname Nguyen is the second most common in Melbourne's phone book after Smith. The city also features substantial Indian, Sri Lankan, and Malaysian-born communities, in addition to recent South African and Sudanese influxes. The cultural diversity is reflected in the city's restaurants that serve international cuisines.

Question: What is the most common surname in Melbourne's phone book?
Ans: Smith


Article: The solution was automation, in the form of a mechanical computer, the Kerrison Predictor. Operators kept it pointed at the target, and the Predictor then calculated the proper aim point automatically and displayed it as a pointer mounted on the gun. The gun operators simply followed the pointer and loaded the shells. The Kerrison was fairly simple, but it pointed the way to future generations that incorporated radar, first for ranging and later for tracking. Similar predictor systems were introduced by Germany during the war, also adding radar ranging as the war progressed.

Question: What other country designed similar systems to the Predictor?
Ans: Germany


Article: Though the country's foreign relations, particularly with Western nations, have been strained, relations have thawed since the reforms following the 2010 elections. After years of diplomatic isolation and economic and military sanctions, the United States relaxed curbs on foreign aid to Myanmar in November 2011 and announced the resumption of diplomatic relations on 13 January 2012 The European Union has placed sanctions on Myanmar, including an arms embargo, cessation of trade preferences, and suspension of all aid with the exception of humanitarian aid.

Question: How have international relations developed due to the recent political changes in Burma ? 
Ans:
relations have thawed since the reforms following the 2010 elections.