A delta-connected motor has _____.
a. 3 leads
b. 6 leads
c. 8 leads
d. 9 leads
d. 9 leads
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Answer the following statement(s) true (T) or false (F)
1. Solenoids are electromagnetic coils that use a movable plunger to translate electrical energy into straight-line motion. 2. A relay is an electromagnetic switch, almost always with a single switching contact, that may open or close when the relay coil is energized. 3. For the better part of this century, millions of relays have been used as controls for very strong currents or high voltages, with a relatively small voltage or current source. 4. This concept of relay ladder logic plays an important role in the solid-state devices known as programmable processors. 5. The electric bell (or buzzer) demonstrates the principle of modifying a relay circuit to produce vibratory motion.
What is the purpose of the heat exchanger?
A) To separate the combustion gas from the circulating air while transferring heat from the circulating air to the combustion gas B) To exchange the combustion gas for the circulating air in order to transfer heat into the house C) To mix the combustion gas and the circulating air to transfer heat from the combustion gas to the house D) To separate the combustion gas from the circulating air while transferring heat from the combustion gas to the circulating air
When a moment frame does not exceed 12 stories in height and the story height is at least 10 ft, the ASCE standard provides a simpler expression to compute the approximate fundamental period: T = 0.1N where N = number of stories. Recompute T with the above expression and compare it with that obtained from Problem P2.16. Which method produces a larger seismic base shear?
Problem 2.16
Consider the five-story building shown in Figure P2.10. The average weights of the floor and
roof are 90 lb/ft 2 and 70 lb/ft 2 , respectively. The values of S DS and S D1 are equal to 0.9g and 0.4g, respectively. Since steel moment frames are used in the north-south direction to resist the seismic forces, the value of R equals 8. Compute the seismic base shear V. Then distribute the base shear along the height of the building.
Discuss the concept of basic size.
What will be an ideal response?