NYC Escalator Mechanic Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1.An escalator in a high-traffic transit station intermittently stops during peak
hours. The technician observes that the motor overheats and the thermal
overload trips after extended operation. Which of the following is the most
probable root cause that should be investigated first?
A. Excessive lubrication on step chains
B. Undersized motor ventilation or obstructed cooling fan airflow
C. Incorrect handrail color coding
D. Over-tensioned lighting circuit wiring
B
The most likely cause is insufficient motor cooling due to blocked airflow or
ventilation failure, which leads to overheating and activation of the
thermal overload protection.
2. During routine inspection of an escalator step chain assembly, a
mechanic notices uneven elongation between left and right chains.
What is the most appropriate corrective action?
A. Replace only the shorter chain
B. Adjust handrail tension to compensate
C. Replace both step chains as a matched set
D. Increase escalator speed to balance wear
,C
Step chains must always be replaced as matched pairs to maintain
synchronization and prevent uneven loading, misalignment, and
accelerated wear.
3. A safety brake on an escalator fails to engage during a power loss
simulation test. Which component should be inspected first?
A. Step tread lighting circuit
B. Electromechanical brake solenoid and linkage assembly
C. Escalator comb plate alignment
D. Handrail rubber composition
B
The electromechanical brake system is responsible for stopping the
escalator during power loss, so failure in the solenoid or linkage is the most
direct cause to inspect.
4. An escalator experiences excessive vibration at mid-span during
operation. Which condition is most likely responsible?
A. Loose or worn step rollers and track alignment issues
B. Overvoltage in building electrical supply
C. Incorrect signage placement near landing
D. Dirty handrail surface coating
A
Worn step rollers or misaligned tracks create instability in step movement,
leading to vibration particularly at mid-span where support stress is
highest.
5. A technician finds abnormal wear on the comb plates at both landings
of an escalator. What is the most likely contributing factor?
,A. Excessive handrail friction
B. Improper step-to-comb plate clearance
C. Over-lubrication of motor bearings
D. Incorrect emergency stop button color
B
Incorrect clearance between steps and comb plates leads to repeated
impact and scraping, causing premature wear and potential safety
hazards.
6. An escalator handrail intermittently slips even though the drive system
is functioning normally. What should be checked first?
A. Step chain tension only
B. Handrail drive roller pressure and wear condition
C. Lighting voltage in handrail system
D. Comb plate alignment
B
Handrail slippage is most commonly caused by worn drive rollers or
insufficient pressure in the handrail drive system.
7. A maintenance technician observes that an escalator runs in the wrong
direction after a control panel replacement. What is the most likely
cause?
A. Incorrect phase sequence in incoming power supply
B. Excess lubrication on step chains
C. Misaligned comb plate teeth
D. Damaged escalator balustrade glass
A
, Reversed phase sequence in a three-phase system will cause the motor to
rotate in the opposite direction, leading to reversed escalator travel.
8. During inspection, a burning smell is detected near the escalator
control cabinet. What is the most appropriate immediate action?
A. Increase escalator speed to clear load
B. Open cabinet and continue operation
C. Shut down escalator and isolate power supply
D. Adjust step chain lubrication
C
A burning smell indicates possible electrical fault or overheating, requiring
immediate shutdown and isolation to prevent fire or damage.
9. An escalator’s step chain tension is found to be too loose. What is the
primary risk?
A. Increased handrail friction
B. Step skipping or derailment from track
C. Reduced lighting efficiency
D. Increased comb plate alignment accuracy
B
Loose step chain tension can cause steps to misalign or derail from the
track system, creating a serious safety hazard.
10. What is the primary function of an escalator governor system?
A. Controls step lighting brightness
B. Monitors and limits escalator overspeed conditions
C. Adjusts handrail color coding
D. Lubricates step chains automatically
B
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1.An escalator in a high-traffic transit station intermittently stops during peak
hours. The technician observes that the motor overheats and the thermal
overload trips after extended operation. Which of the following is the most
probable root cause that should be investigated first?
A. Excessive lubrication on step chains
B. Undersized motor ventilation or obstructed cooling fan airflow
C. Incorrect handrail color coding
D. Over-tensioned lighting circuit wiring
B
The most likely cause is insufficient motor cooling due to blocked airflow or
ventilation failure, which leads to overheating and activation of the
thermal overload protection.
2. During routine inspection of an escalator step chain assembly, a
mechanic notices uneven elongation between left and right chains.
What is the most appropriate corrective action?
A. Replace only the shorter chain
B. Adjust handrail tension to compensate
C. Replace both step chains as a matched set
D. Increase escalator speed to balance wear
,C
Step chains must always be replaced as matched pairs to maintain
synchronization and prevent uneven loading, misalignment, and
accelerated wear.
3. A safety brake on an escalator fails to engage during a power loss
simulation test. Which component should be inspected first?
A. Step tread lighting circuit
B. Electromechanical brake solenoid and linkage assembly
C. Escalator comb plate alignment
D. Handrail rubber composition
B
The electromechanical brake system is responsible for stopping the
escalator during power loss, so failure in the solenoid or linkage is the most
direct cause to inspect.
4. An escalator experiences excessive vibration at mid-span during
operation. Which condition is most likely responsible?
A. Loose or worn step rollers and track alignment issues
B. Overvoltage in building electrical supply
C. Incorrect signage placement near landing
D. Dirty handrail surface coating
A
Worn step rollers or misaligned tracks create instability in step movement,
leading to vibration particularly at mid-span where support stress is
highest.
5. A technician finds abnormal wear on the comb plates at both landings
of an escalator. What is the most likely contributing factor?
,A. Excessive handrail friction
B. Improper step-to-comb plate clearance
C. Over-lubrication of motor bearings
D. Incorrect emergency stop button color
B
Incorrect clearance between steps and comb plates leads to repeated
impact and scraping, causing premature wear and potential safety
hazards.
6. An escalator handrail intermittently slips even though the drive system
is functioning normally. What should be checked first?
A. Step chain tension only
B. Handrail drive roller pressure and wear condition
C. Lighting voltage in handrail system
D. Comb plate alignment
B
Handrail slippage is most commonly caused by worn drive rollers or
insufficient pressure in the handrail drive system.
7. A maintenance technician observes that an escalator runs in the wrong
direction after a control panel replacement. What is the most likely
cause?
A. Incorrect phase sequence in incoming power supply
B. Excess lubrication on step chains
C. Misaligned comb plate teeth
D. Damaged escalator balustrade glass
A
, Reversed phase sequence in a three-phase system will cause the motor to
rotate in the opposite direction, leading to reversed escalator travel.
8. During inspection, a burning smell is detected near the escalator
control cabinet. What is the most appropriate immediate action?
A. Increase escalator speed to clear load
B. Open cabinet and continue operation
C. Shut down escalator and isolate power supply
D. Adjust step chain lubrication
C
A burning smell indicates possible electrical fault or overheating, requiring
immediate shutdown and isolation to prevent fire or damage.
9. An escalator’s step chain tension is found to be too loose. What is the
primary risk?
A. Increased handrail friction
B. Step skipping or derailment from track
C. Reduced lighting efficiency
D. Increased comb plate alignment accuracy
B
Loose step chain tension can cause steps to misalign or derail from the
track system, creating a serious safety hazard.
10. What is the primary function of an escalator governor system?
A. Controls step lighting brightness
B. Monitors and limits escalator overspeed conditions
C. Adjusts handrail color coding
D. Lubricates step chains automatically
B
