Which of the following is determined by pi (?) times the radius squared?
a. circumference
b. radius
c. volume
d. area of a circle
ANSWER: d
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The posttensioning of elevated concrete floors reduces the slab and beam dimensions. This reduces the cost of concrete and reinforcing bars but is compensated for by the added cost of posttensioning steel and the use of more skilled (posttensioning) labor. So, why is posttensioning of concrete structures so popular.
What will be an ideal response?
Almost all of the food we eat is sold fresh
Indicate whether the statement is true or false
As shown in Fig. 12.72, a three-phase four-wire line with a phase voltage of 120 V rms, with a positive phase sequence, supplies a balanced motor load at 260 kVA at 0.85 pf lagging. The motor load is connected to the three main lines marked a, b, and c. In addition, incandescent lamps (unity pf) are connected as follows: 24 kW from line a to the neutral, 15 kW from line b to the neutral, and 9 kW from line c to the neutral.
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What are free electrons?
A) Electrons that flow without any energy input B) Electrons that are no longer bound to their atoms C) Electrons that escape from conductors into the surrounding air D) Electricity that the power company does not charge for