The SCR is a four-layer device.

Answer the following statement true (T) or false (F)


True

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In addition to heat and work flows, energy can be transferred as light, as in a photovoltaic device (solar cell). The energy content of light depends on both its wavelength (color) and its intensity. When sunlight impinges on a solar cell, some is reflected, some is absorbed and converted to electrical work, and some is absorbed and converted to heat. Consider an array of solar cells with an area of 3 m2. The power of sunlight impinging upon it is 1 kW? m?2. The array converts 17% of the incident power to electrical work, and it reflects 20% of the incident light. At steady state, what is the rate of heat removal from the solar cell array?

What will be an ideal response?

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To force air into an air spring on an electronic air suspension system, the compressor must be running and the air spring valve must be de-energized.

Answer the following statement true (T) or false (F)

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The sum of two numbers is 8 and the sum of the squares of the numbers is 40. What are the numbers?

Fill in the blank(s) with the appropriate word(s).

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The compressor in a system with an automatic pump-down control periodically operates for a short time even though the load temperature control is off. What could be a cause for this action?

What will be an ideal response?

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