TDLR – Sign Electrician Examination
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a disconnecting means for an
electric sign?
A. To increase the sign's brightness
B. To reduce voltage to the sign
C. To provide overcurrent protection only
D. To allow the sign circuit to be safely disconnected from the power
source
Rationale: A disconnecting means allows the electrical supply to a sign
to be isolated so installation, maintenance, inspection, and servicing
can be performed safely. It is distinct from overcurrent protection,
which protects conductors and equipment from excessive current.
,2. Which component is commonly used to protect conductors from
excessive current?
A. Transformer
B. Photocell
C. Circuit breaker
D. Ballast
Rationale: A circuit breaker opens the circuit when current exceeds its
rated protective value for an appropriate period. Transformers,
photocells, and ballasts serve different functions and are not
substitutes for overcurrent protection.
3. Before beginning electrical work on an existing sign, what should be
done first?
A. Remove the sign face
B. Replace all lamps
C. De-energize the circuit and verify that it is de-energized
D. Disconnect the grounding conductor
Rationale: Electrical safety begins with controlling the energy source.
The circuit should be disconnected and the absence of voltage verified
with suitable test equipment before work begins.
4. What is the purpose of an equipment grounding conductor?
,A. To carry normal operating current
B. To increase circuit voltage
C. To reduce lamp wattage
D. To provide a low-impedance path for fault current
Rationale: The equipment grounding conductor helps fault current
return to the source so the overcurrent protective device can operate
and disconnect the faulted circuit. It normally does not carry load
current.
5. A sign cabinet is constructed of metal and contains electrical
equipment. What should generally be provided?
A. A plastic grounding conductor
B. A bonding connection to the equipment grounding system
C. A second neutral conductor
D. An additional photocell
Rationale: Accessible conductive metal parts associated with electrical
equipment should be bonded to the grounding system. Proper
bonding helps prevent dangerous voltage from remaining on the
metal cabinet during a fault.
6. What is the main function of a transformer used with a low-voltage
sign system?
, A. To increase conductor resistance
B. To convert AC into mechanical energy
C. To change the voltage supplied to the sign circuit
D. To provide circuit overcurrent protection
Rationale: A transformer transfers electrical energy between circuits
and changes voltage according to its turns ratio. It does not replace
the required overcurrent protective device.
7. What does a photocell typically do when installed on an outdoor
sign?
A. Measures conductor resistance
B. Automatically controls the sign based on ambient light conditions
C. Converts AC to DC
D. Provides grounding protection
Rationale: A photocell senses surrounding light levels and can switch a
sign on when it becomes dark and off when sufficient daylight returns.
This provides automatic lighting control.
8. Why are conductors inside a sign enclosure required to be properly
supported?
A. To increase electrical resistance
B. To make the sign brighter
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a disconnecting means for an
electric sign?
A. To increase the sign's brightness
B. To reduce voltage to the sign
C. To provide overcurrent protection only
D. To allow the sign circuit to be safely disconnected from the power
source
Rationale: A disconnecting means allows the electrical supply to a sign
to be isolated so installation, maintenance, inspection, and servicing
can be performed safely. It is distinct from overcurrent protection,
which protects conductors and equipment from excessive current.
,2. Which component is commonly used to protect conductors from
excessive current?
A. Transformer
B. Photocell
C. Circuit breaker
D. Ballast
Rationale: A circuit breaker opens the circuit when current exceeds its
rated protective value for an appropriate period. Transformers,
photocells, and ballasts serve different functions and are not
substitutes for overcurrent protection.
3. Before beginning electrical work on an existing sign, what should be
done first?
A. Remove the sign face
B. Replace all lamps
C. De-energize the circuit and verify that it is de-energized
D. Disconnect the grounding conductor
Rationale: Electrical safety begins with controlling the energy source.
The circuit should be disconnected and the absence of voltage verified
with suitable test equipment before work begins.
4. What is the purpose of an equipment grounding conductor?
,A. To carry normal operating current
B. To increase circuit voltage
C. To reduce lamp wattage
D. To provide a low-impedance path for fault current
Rationale: The equipment grounding conductor helps fault current
return to the source so the overcurrent protective device can operate
and disconnect the faulted circuit. It normally does not carry load
current.
5. A sign cabinet is constructed of metal and contains electrical
equipment. What should generally be provided?
A. A plastic grounding conductor
B. A bonding connection to the equipment grounding system
C. A second neutral conductor
D. An additional photocell
Rationale: Accessible conductive metal parts associated with electrical
equipment should be bonded to the grounding system. Proper
bonding helps prevent dangerous voltage from remaining on the
metal cabinet during a fault.
6. What is the main function of a transformer used with a low-voltage
sign system?
, A. To increase conductor resistance
B. To convert AC into mechanical energy
C. To change the voltage supplied to the sign circuit
D. To provide circuit overcurrent protection
Rationale: A transformer transfers electrical energy between circuits
and changes voltage according to its turns ratio. It does not replace
the required overcurrent protective device.
7. What does a photocell typically do when installed on an outdoor
sign?
A. Measures conductor resistance
B. Automatically controls the sign based on ambient light conditions
C. Converts AC to DC
D. Provides grounding protection
Rationale: A photocell senses surrounding light levels and can switch a
sign on when it becomes dark and off when sufficient daylight returns.
This provides automatic lighting control.
8. Why are conductors inside a sign enclosure required to be properly
supported?
A. To increase electrical resistance
B. To make the sign brighter
