ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
19th Edition
ISBN: 9781337116213
Author: MULLIN
Publisher: CENGAGE L
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Chapter 26, Problem 12R

An important but often overlooked requirement in the National Fire Alarm Code, NFPA 72 is that alarms must be replaced after being in service for (circle the correct answer)

  1. a. not more than 5 years.
  2. b. not more than 10 years.
  3. c. not more than 15 years.
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Please answer quickly.   17. The filament of incandescent lamp is usually made of:       a. copper       b. silver       c. aluminum       d. tungsten   18. A current measuring instrument can be modified to measure voltages by:       a. using thicker wire in the coil      b. using a high resistance shunt      c. adding resistance in series      d. adding resistance in parallel   21. "When two power sources are connected in a series-aiding configuration, the output voltage equals the _____________"        a. supply with the highest voltage        b. supply with the lowest voltage        c. difference of the two supplies       d. sum of the two supplies
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