3.0—Home Security and Surveillance Systems
3.0—Home Security and Surveillance Systems
3.0—Home Security and Surveillance Systems
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156<br />
Chapter<br />
................................................<br />
3<br />
Question 5<br />
How many wires are normally required for connecting a passive sensor to the<br />
control panel?<br />
❍ A. 1<br />
❍ B. 4<br />
❍ C. 2<br />
❍ D. 3<br />
The correct answer is C. A passive sensor requires two wires because no<br />
power is applied to a passive security system sensor. An active sensor requires<br />
four wires because, by definition, an active sensor requires a power source.<br />
Answers A, B, <strong>and</strong> D are incorrect because they each represent the incorrect<br />
number of wires required to connect a passive sensor to a control panel.<br />
Question 6<br />
Which type of sensor is used for door installations?<br />
❍ A. PIR<br />
❍ B. Contact sensor<br />
❍ C. Active<br />
❍ D. Magnetic switch<br />
Answer D is the correct answer. Magnetic switches are used for doors<br />
because of their low cost <strong>and</strong> capability to be hidden.<br />
Question 7<br />
Which types of cable are used when installing video surveillance components?<br />
❍ A. RG-6 <strong>and</strong> RG-58<br />
❍ B. RG-8 <strong>and</strong> RG-59<br />
❍ C. RG-59 <strong>and</strong> RG-6<br />
❍ D. RG-59 <strong>and</strong> RG-58<br />
Answer C is correct. RG-6 <strong>and</strong> RG-59 are both 75-ohm types of cable.<br />
RG-6 is a higher grade used for low loss applications, whereas RG-59 is satisfactory<br />
for short runs. RG-8 <strong>and</strong> RG-58 are rated at 50 ohms of impedance
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