One of the minor differences between troubleshooting a geothermal heat pump and an air-to-air heat pump is how to gain access to pressures and temperatures in the water or ground loop.
Answer the following statement true (T) or false (F)
True
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Aggregates are clusters of soil particles
Indicate whether the statement is true or false
Which of the following conditions places undue stress on the stifle muscle?
a. sickle hocks c. splayfooting b. post legs d. buck knees
PVC bends must be made so that the conduit remains undamaged and the internal diameter of the conduit is ____.
A. not reduced B. reduced by no more than one third C. reduced by no more than one half D. reduced by no more than two thirds
A periodic rectangular pulse train f(t) shown below has amplitude A = 1 V, pulse width ? = 0.35 ms, and period T0 = 1 ms. The pulse is centered at t = 0.
(a) Find the fundamental frequency f0 of this signal. (b) Find the duty cycle d of this signal. (c) Find the numerical values of a0, and an for 1 ? n ? 5. (d) Plot the one-sided magnitude spectrum for 0 ? f ? 5f0. (e) Plot the one-sided phase spectrum for 0 ? f ? 5f0. (f) Find the expression of approximation ˆ( ) f t consisting of the dc component, the fundamental component, the second harmonic component, and the third harmonic component of its trigonometric Fourier series (sum of cosines). The coefficients must be numbers.