Describe how a large concentrator array for a solar power tower converts sunlight to electricity
What will be an ideal response?
A receiver at the top of a tower is heated by heliostats which direct sunlight to the receiver. A heat transfer fluid is used to produce steam, driving a steam turbine and generator. Hot, molten salt can be stored to allow electricity to be generated when there is no sunlight available.
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Un sellado eficaz y permanente es uno de los métodos utilizado para evitar la entrada de polvo en los receptáculos mediante un sistema de conductos en una ubicación Clase II, División 2. Otra manera es:
a. un puente de conexión. b. un sistema de conductos horizontal no inferior a 10' (3,05 m) de longitud. c. un sistema de conductos vertical no inferior a 3' (0,60 m) de longitud. d. contratuercas doble.
The main overcurrent protective device that feeds a marina must have ground-fault protection of no more than _____.
a. 10mA b. 30mA c. 50mA d. 100mA
What post-transplant problems can affect young trees that have thin bark?
What will be an ideal response?
Piling foundations are used when conventional trenching equipment cannot be used safely or economically.
Answer the following statement true (T) or false (F)