What are thyristors?

What will be an ideal response?


Thyristors make up the family of semiconductor devices used in high-power control and high-speed switching applications. The most common thyristors are the SCR, diac, and triac.

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Which of the following statements is true for commercial installations of glass block?

A. Longer walls or panels of glass should not be laid to a line in mortar. B. Larger installations require that they be divided into a series of individual panels. C. Masons use a margin trowel on large commercial installations. D. Prepackaged mixes are the least expensive option for commercial jobs.

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Which of the following does most to define the piston stroke dimension?

A. Crank throw dimension B. Connecting rod length C. Swept volume D. Clearance volume

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Which two compounds are necessary for the formation of photochemical smog?

A. nitrogen and oxygen B. NOx and HC C. sulfur and carbon dioxide D. H2O and SO2

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Why are thermostatic expansion valves often used as the outdoor metering device for the heating cycle?

A) TEVs can be adjusted in the field to match the heat pump performance with the climate it will be operating in B) TEVs are easier to install on the outdoor coil C) TEVs allow the system pressures to equalize on the off cycle, allowing the use of low starting torque compressors D) The TEV can modulate the refrigerant flow over the wide range of temperatures experienced in the heating mode

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