1)The word Christmas originates from the words Christ's Mass. In old English (first recorded in 1038) it was referred to as Cristesmæsse, which literally means 'Christian Mass'. | ||||
2)A common figure known throughout the world and associated with Christmas is Santa Claus. Other popular Christmas figures include Christkind, Saint Nicholas, and Father Christmas. | ||||
3)Anglo-Saxons referred to the holiday as 'midwinter' or 'nativity'. 4)In order for Santa to visit all the homes on Christmas Eve he would have to visit 822 homes each second. 5)The tradition of hanging stockings comes from a Dutch custom. They would leave shoes full of food for St. Nicolas' donkeys and St. Nicholas would then leave small gifts in return.
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Single generator sets of over 600 MW are now used in the UK, though there are many smaller generators in use. A 600 MW generator can supplythe average needs of over 1 million UK households. Three or four such generators are typically installed in a single large coal-fired station which isoften sited close to a coal mine, away from the city dwellers who consume the electricity. Such generators are usually driven by a compound arrangement of highpressure, intermediate-pressure and low-pressure turbines, increasing in size as the pressure decreases. Modern turbines rotate in a speed range from 1500 to 3500 r.p.m., usually 3000 r.p.m. for the UK’s 50 Hz system. For large coal-fired plant the steam pressure could be 25 megapascals (MPa) with steam temperatures of 500–600 °C to improve the thermodynamic efficiency. In nuclear reactors, which operate under less demanding conditions, the steam is superheated to about 5 MPa and 300 °C. Modern water tube boilers are complex and have ...
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