When selecting a gas furnace, how is its heating capacity determined?
a. Its input rating must exactly match the calculated heat loss of the structure.
b. Its output rating must exactly match the calculated heat loss of the structure.
c. Its output rating can be up to 150 percent of the calculated heat loss of the structure.
d. Its output rating should be no less than 95 percent of the calculated heat loss of the structure.
d
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With the isometric method, the axes are projected onto the paper as if you were looking down ____.
A. a side of a cube B. the diagonal of a cube C. an edge of a pyramid D. a radius of a sphere
NEC Article 440, Part V covers _____.
a. requirements for motor compressor controllers b. the control and protection of fixed electric space heating equipment c. digital control systems d. resistors and reactors
Which coupling would you need for large shaft, heavy loads, allowing no end play?
A. rubbertire. B. flange. C. gear. D. spring.
A function g(t) has the following description. It is zero for t < ? 5. It has a slope of –2 in the range ? 5 < t < ?2. It has the shape of a sine wave of unit amplitude and with a frequency of 1/4 Hz plus a constant in the range ? 2 < t < 2. For t > 2 it decays exponentially toward zero with a time constant of 2 seconds. It is continuous everywhere.
(a) Write an exact mathematical description of this function. (b) Graph g(t) in the range ? 10 < t < 10. (c) Graph g(2t) in the range ? 10 < t < 10. (d) Graph 2g (3 ? t) in the range ? 10 < t < 10. (e) Graph ? 2g ( (t + 1) / 2) in the range ? 10 < t < 10.