What are the advantages of using a ballast lamp instead of a typical series reactor coil in a fluorescent lamp?
What will be an ideal response?
By using the ballast lamp instead of the typical series reactor coil, a fluorescent lamp unit has the following advantages: lower cost, lightweight, no ballast noise, and high power factor value.
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Two common methods of framing the floor system are conventional joist and ____.
A. post-and-seam B. post-and-beam C. beam-and-seam D. beam-and-joist
Answer the following statements true (T) or false (F)
1. Insulating materials that contain HCFC gas within their cells have a higher R-value than those that contain air within their cells. 2. Insulating materials that contain HCFC gas within their cells have a higher R-value than those that contain air within their cells. 3. The use of aluminum foil in attics is more useful in warm climates than in cold climates. 4. A building assembly with a higher U-value is thermally more insulating than one with a lower U-value.
Which type of hammer is plastic coated, has a metal casing inside, and is filled with small lead balls?
A) Soft-blow hammer B) Plastic hammer C) Sledgehammer D) Dead-blow hammer
A positive edge-triggered J-K flip-flop is used to produce a two-phase clock. However, when the circuit is operated it produces erratic results. Close examination with an oscilloscope reveals the presence of glitches. What might be the source of these glitches?
A) A race condition exists between the Q and Q outputs to the AND gate. B) The PRESET and CLEAR terminals may have been left floating. C) A race condition exists between the J and K inputs. D) A race condition exists between the CLOCK and the outputs of the flip-flop feeding the AND gate.