For solar collectors, the absorptivity of the upper surface of the absorber plate should be as low as possible.

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


False

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The ____ is the distance that the piston moves from TDC to BDC.

A. oversquare B. crank throw C. foot-pound D. piston stroke

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A torsion pendulum with a tantalum wire has a pendulum frequency, v, of 0.82 Hz. When the logarithmic decrement, ?, is measured with this pendulum, the peak in the plot of ? versus 1/T occurs at 415.5 K.    Show by using Eq. 13.45, with T = 415.5 K, that this peak corresponds to the presence of oxygen in the tantalum.

What will be an ideal response?

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In some situations, the corrective action of a closed-loop system can be made when the error signal produced by the comparator remains unchanged.

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

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Spalling seen on a failed bearing is an indication that it has failed due to _____

a. normal fatigue b. vibration c. shock loads d. a broken cam

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