NEW YORK SECURITY & FIRE ALARM INSTALLER
EXAMINATION COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR JUST RELEASED
1.
A security alarm circuit uses a 12-volt supply and has a resistance of 6 ohms. What
current should theoretically flow through the circuit?
A. 0.5 ampere
B. 2 amperes
C. 6 amperes
D. 72 amperes
Answer: B. 2 amperes
Rationale: Ohm’s law states that current equals voltage divided by resistance.
Dividing 12 volts by 6 ohms produces a theoretical current of 2 amperes.
2.
Which electrical quantity represents the opposition to current flow in a circuit?
A. Voltage
B. Resistance
C. Power
D. Frequency
Answer: B. Resistance
,Rationale: Resistance opposes the movement of electrical current through a
conductor and is measured in ohms. Higher resistance generally results in lower
current.
3.
An installer measures 24 volts across an energized alarm circuit. Which
instrument setting is most appropriate for measuring that voltage?
A. AC current
B. DC voltage
C. Resistance with power applied
D. Continuity without power
Answer: B. DC voltage
Rationale: Most conventional alarm control circuits use low-voltage DC power, so
the meter should be configured for DC voltage measurement.
4.
What is the primary purpose of an end-of-line resistor in a supervised alarm
circuit?
A. Increase battery capacity
B. Detect certain open-circuit wiring faults
C. Increase notification volume
D. Convert AC power into DC power
,Answer: B. Detect certain open-circuit wiring faults
Rationale: An end-of-line resistor establishes a known circuit condition that
allows the control panel to recognize wiring faults such as an open circuit.
5.
A technician accidentally measures resistance across a powered circuit. What is
the principal concern?
A. The meter automatically increases circuit voltage
B. The resistance reading becomes more accurate
C. The meter or circuit could be damaged
D. The alarm battery becomes fully charged
Answer: C. The meter or circuit could be damaged
Rationale: Resistance measurements require the circuit to be de-energized
because the meter supplies its own test current during measurement.
6.
Which statement best describes a normally closed alarm contact?
A. The circuit is open during normal conditions
B. The circuit is closed during normal conditions
C. The circuit always carries maximum current
D. The contact cannot detect opening
, Answer: B. The circuit is closed during normal conditions
Rationale: A normally closed contact maintains continuity under normal
conditions and opens when the monitored condition occurs.
7.
Why is voltage drop important when selecting conductors for alarm notification
appliances?
A. Excessive voltage drop can prevent devices from operating properly
B. Voltage drop always increases device sensitivity
C. Voltage drop eliminates the need for supervision
D. Voltage drop determines the alarm password
Answer: A. Excessive voltage drop can prevent devices from operating properly
Rationale: Long conductors and excessive current can produce voltage loss,
potentially leaving notification appliances below their required operating voltage.
8.
Two resistors are connected in series. What happens to their total resistance?
A. It becomes the difference between the resistors
B. It becomes the sum of their resistances
C. It becomes zero
D. It always equals the smaller resistor
EXAMINATION COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR JUST RELEASED
1.
A security alarm circuit uses a 12-volt supply and has a resistance of 6 ohms. What
current should theoretically flow through the circuit?
A. 0.5 ampere
B. 2 amperes
C. 6 amperes
D. 72 amperes
Answer: B. 2 amperes
Rationale: Ohm’s law states that current equals voltage divided by resistance.
Dividing 12 volts by 6 ohms produces a theoretical current of 2 amperes.
2.
Which electrical quantity represents the opposition to current flow in a circuit?
A. Voltage
B. Resistance
C. Power
D. Frequency
Answer: B. Resistance
,Rationale: Resistance opposes the movement of electrical current through a
conductor and is measured in ohms. Higher resistance generally results in lower
current.
3.
An installer measures 24 volts across an energized alarm circuit. Which
instrument setting is most appropriate for measuring that voltage?
A. AC current
B. DC voltage
C. Resistance with power applied
D. Continuity without power
Answer: B. DC voltage
Rationale: Most conventional alarm control circuits use low-voltage DC power, so
the meter should be configured for DC voltage measurement.
4.
What is the primary purpose of an end-of-line resistor in a supervised alarm
circuit?
A. Increase battery capacity
B. Detect certain open-circuit wiring faults
C. Increase notification volume
D. Convert AC power into DC power
,Answer: B. Detect certain open-circuit wiring faults
Rationale: An end-of-line resistor establishes a known circuit condition that
allows the control panel to recognize wiring faults such as an open circuit.
5.
A technician accidentally measures resistance across a powered circuit. What is
the principal concern?
A. The meter automatically increases circuit voltage
B. The resistance reading becomes more accurate
C. The meter or circuit could be damaged
D. The alarm battery becomes fully charged
Answer: C. The meter or circuit could be damaged
Rationale: Resistance measurements require the circuit to be de-energized
because the meter supplies its own test current during measurement.
6.
Which statement best describes a normally closed alarm contact?
A. The circuit is open during normal conditions
B. The circuit is closed during normal conditions
C. The circuit always carries maximum current
D. The contact cannot detect opening
, Answer: B. The circuit is closed during normal conditions
Rationale: A normally closed contact maintains continuity under normal
conditions and opens when the monitored condition occurs.
7.
Why is voltage drop important when selecting conductors for alarm notification
appliances?
A. Excessive voltage drop can prevent devices from operating properly
B. Voltage drop always increases device sensitivity
C. Voltage drop eliminates the need for supervision
D. Voltage drop determines the alarm password
Answer: A. Excessive voltage drop can prevent devices from operating properly
Rationale: Long conductors and excessive current can produce voltage loss,
potentially leaving notification appliances below their required operating voltage.
8.
Two resistors are connected in series. What happens to their total resistance?
A. It becomes the difference between the resistors
B. It becomes the sum of their resistances
C. It becomes zero
D. It always equals the smaller resistor
