Deck 22: A Solid State Alarm With Battery Backup

Question 1

A 12-volt battery can be used to provide continued operation of 120 VAC until the AC power is restored.

Answer 1

True

Question 2

The fuse in an alarm circuit is used to protect against a ground fault.

Answer 2

False

Question 3

The arm switch is connected in parallel with the key switch, and located on the front panel of the alarm.

Answer 3

True

Question 4

The dotted line between two switches shows ____.

A) AC DC voltage
B) the mechanical connection
C) the filtered ripple
D) reverse bias

Question 5

Sensor switches used on doors and windows are normally _____ and form one continuous series circuit.

A) closed
B) open
C) blocked
D) marked

Question 6

In the accompanying figure, switch S1 is a single-pole switch.
 

Question 7

In the accompanying figure, diode D7 is an LED connected in ____ with the gate of the SCR.  

A) series
B) parallel
C) sequence
D) link

Question 8

The _____ is the real controller of an alarm circuit.

A) fuse
B) resistor
C) SCR
D) diode

Question 9

In the accompanying figure, the key switch is a ____ switch installed at an outer door of the building the alarm is to protect.  

A) blocked
B) manual
C) lateral
D) key-locked

Question 10

In the accompanying figure, fuse F1 is used to protect against under voltage.
 


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