If air conditioning is to be added to an existing forced-air heating system, what must be taken into account?
A. duct size
B. fan speed
C. required air volume
D. all of the above
Answer: D
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The fall-of-potential method is used to measure _____.
a. induced currents b. step voltage c. earth resistance d. touch voltage
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Materials are usually quoted including taxes.
Answer the following statement true (T) or false (F)
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The subsequent problems deal with the circuit below:
NOTE: Assume the op amp is ideal.If Vin = 5 V, what is Vout?
A. ?5 V B. 2.5 V C. ?2.5 V D. 0 V E. 5 V
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Plumbing systems began to be developed in the United States in the
A. 1850s B. 1860s C. 1870s D. 1880s
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