QUES: Motors have very little room for electrical insulation so they generally have low voltage ratings. Because transformers (prior to the development of power electronics) cannot step down DC voltages, trains were supplied with a relatively low DC voltage that the motors can use directly. The most common DC voltages are listed in the previous section. Third (and fourth) rail systems almost always use voltages below 1 kV for safety reasons while overhead wires usually use higher voltages for efficiency. ("Low" voltage is relative; even 600 V can be instantly lethal when touched.)
Fifth (and sixth) railsystems use what voltages for safety reasons?

ANS: unanswerable

QUES: In the following year, Bell became professor of Vocal Physiology and Elocution at the Boston University School of Oratory. During this period, he alternated between Boston and Brantford, spending summers in his Canadian home. At Boston University, Bell was "swept up" by the excitement engendered by the many scientists and inventors residing in the city. He continued his research in sound and endeavored to find a way to transmit musical notes and articulate speech, but although absorbed by his experiments, he found it difficult to devote enough time to experimentation. While days and evenings were occupied by his teaching and private classes, Bell began to stay awake late into the night, running experiment after experiment in rented facilities at his boarding house. Keeping "night owl" hours, he worried that his work would be discovered and took great pains to lock up his notebooks and laboratory equipment. Bell had a specially made table where he could place his notes and equipment inside a locking cover. Worse still, his health deteriorated as he suffered severe headaches. Returning to Boston in fall 1873, Bell made a fateful decision to concentrate on his experiments in sound.
What did Bell do late at night?

ANS: experiments

QUES: Henry VIII's wine cellar at the Palace of Whitehall, built in 15141516 for Cardinal Wolsey, is in the basement of Main Building, and is used for entertainment. The entire vaulted brick structure of the cellar was encased in steel and concrete and relocated nine feet to the west and nearly 19 feet (5.8 m) deeper in 1949, when construction was resumed at the site after World War II. This was carried out without any significant damage to the structure.
Where is Henry VIII's wine cellar?

ANS: the basement of Main Building

QUES: Two days later, it was announced that Luis Enrique would return to Barcelona as head coach, after he agreed to a two-year deal. He was recommended by sporting director Andoni Zubizarreta, his former national teammate. Following Enrique's arrival, Barcelona broke their transfer record when they paid Liverpool F.C. between 81 to 94 million for striker Luis Suarez, who was serving a four-month ban from all football-related activity imposed by the FIFA Disciplinary Committee after biting Italian defender Giorgio Chiellini during his appearance for Uruguay in a World Cup group stage match.
How long did Enrique 's deal as coach run?

ANS:
two-year