The reason many installations utilize a straight main trunk line with flexible duct runs to the individual register boots is to ____.

A. eliminate the expense of custom-made duct sections
B. reduce excessive noise
C. speed up the installation process
D. all of the above


Answer: D

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PROBLEM 3.104The shaft AB is made of a material that is elastoplastic with ?Y ? 90 MPa and G ? 30 GPa. For the loading shown, determine (a) the radius of the elastic core of the shaft, (b) the angle of twist at end B

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The effect of soil organic matter on the amount of water available to plants is due to organic matter influence on total soil porosity as well as to the water-supplying power of the soil organic matter

Indicate whether the statement is true or false

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Axle windup is most often a problem with _________

A) Front-wheel drive vehicles B) Vehicles with a live rear axle C) Both A and B D) Neither A nor B

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Assume that an op-amp has a differential voltage gain of 1800 and a common-mode voltage gain of 0.02. The CMMR for the op-amp is

A) 18,000 B) 900,000 C) 90,000 D) 180,000

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