HTS superconductors may lead to larger and more effective use of ____________________ wind-generation systems.
Fill in the blank(s) with the appropriate word(s).
direct-drive
direct drive
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Needle valves are used for fine flow control because _____.
a. the shape provides a gradual increase or decrease in the size of the valve opening b. they are very inexpensive c. they are made of stainless steel d. they exhibit high head loss
Calculate the time for one cycle of an alternating wave if the frequency is measured at 120 Hz.
What will be an ideal response?
Mortar is the first material you use when laying any masonry unit.
Answer the following statement true (T) or false (F)
An element in an electric heating unit is connected to a 232-V power supply. The current flow through the element is 19 A. What is the resistance of the element?
A. 8 ? B. 10 ? C. 12 ? D. 14 ?