Question 1

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

Accepted Answer

A 12-volt battery cannot provide continued operation of 120 VAC.

Question 2

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

Accepted Answer

The fuse in an alarm circuit is primarily used to protect against overcurrent situations, not specifically for ground faults.

Question 3

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

Accepted Answer

The arm switch is connected in parallel with the key switch, which means that they are both connected to the same two points in the circuit. This means that when the arm switch is closed, the key switch will also be closed, and vice versa.

Question 4

The dotted line between two switches shows ____.
A) AC DC voltage
B) the mechanical connection
C) the filtered ripple
D) reverse bias

Accepted Answer

The dotted line between two switches typically indicates a mechanical connection, meaning that the operation of one switch is mechanically linked to the operation of the other.

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

Accepted Answer

Sensor switches on doors and windows are typically in a closed state when the door or window is shut, completing the circuit. This ensures that any opening breaks the circuit, triggering an alarm or notification.

Question 6

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

Accepted Answer

The answer of In the accompanying figure, switch S1 is...

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

Accepted Answer

The answer of In the accompanying figure, diode D7 is...

Question 8

The _____ is the real controller of an alarm circuit.
A) fuse
B) resistor
C) SCR
D) diode

Accepted Answer

The SCR (Silicon Controlled Rectifier) is the real controller in an alarm circuit because it can switch the alarm on or off based on the control signal it receives.

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

Accepted Answer

The answer of In the accompanying figure, the key switch...

Question 10

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

​ 
 ​ 
 ​

Accepted Answer

The answer of In the accompanying figure, fuse F1 is...

Quiz 22: A Solid State Alarm With Battery Backup

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

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

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

The dotted line between two switches shows ____.

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

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

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

The _____ is the real controller of an alarm circuit.

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

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

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