A low-head hydro system turns 920 W of water potential energy into 377.2 W of electricity. What is the efficiency of the system??
Fill in the blank(s) with the appropriate word(s).
41%
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____ additions are restricted to stainless steels because it is the primary cause of porosity in aluminum welds.
A. Nitrogen B. Helium C. Argon D. Hydrogen
Many of the callouts on the landing detail are a decimal number followed by a letter. That is the ____ symbol.
A. material B. master C. index D. keynote
A monostable 555 timer is designed using the following external components: RA = 1.8 k?, C = 400 pF. What is the pulse width (tw) of the output?
A) 3.1 ms B) 1.14 ?s C) 2.4 ?s D) 0.79 ?s A) 940 ?s B) 84 ?s C) 900 ?s D) 880 ns
When connecting a large electrolytic capacitor to a circuit with a 100 VDC source, place the negative end of the capacitor ________
A) in either position; the polarity is not important B) towards the positive side of the source C) towards the negative side of the source