Mechanic Verified Multiple Choice and
Conceptual Actual Emended Exam Questions
With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update
When retrofitting an old DC motor with an SCR drive, what should be done with
the interpoles?
ANSWER Leave the interpoles in place; they are still necessary for
commutation.
What is the maximum time allowed for a hydraulic buffer to return to full height
after a full-speed test?
ANSWER 90 seconds (per ASME A17.1)
What is the primary purpose of a hydraulic buffer in an elevator system?
ANSWER To absorb the kinetic energy of the car or counterweight during an
uncontrolled descent or overspeed event.
During a buffer test, you observe the buffer piston rising slowly after impact and
taking 120 seconds to reset. What’s the status?
ANSWER The buffer fails the code requirement and must be repaired or
replaced.
,What is the required relief valve setting for a hydraulic elevator system with a
working pressure of 450 PSI?
ANSWER 450 × 150% = 675 PSI
According to ASME A17.1, what pressure must the hydraulic system relief valve
not exceed?
ANSWER 150% of the system’s working pressure
What is the correct test procedure to verify buffer functionality during an
acceptance test?
ANSWER The car must be run at full speed into fully compressed buffers and
timing recorded for recovery.
What tool is used to verify the working pressure of a hydraulic system?
ANSWER Hydraulic pressure gauge attached to the main line or valve port.
The pressure gauge reads 400 PSI while the elevator is rising. What should the
relief valve be set to?
ANSWER No more than 600 PSI (400 × 1.5)
You are conducting a Category 1 test and must verify the relief valve. What do you
do?
ANSWER Manually override the valve to exceed working pressure and observe
the relief valve opening at the set limit.
, What component protects a hydraulic elevator from overpressure if the pump
continues running while the car is stalled?
ANSWER The relief valve
What happens if the hydraulic buffer is overfilled with oil?
ANSWER The buffer may fail to compress properly, increasing impact forces
and risking damage to the car or frame.
What is the typical PSI rating for a hydraulic test pump used during
commissioning?
ANSWER Between 500–3,000 PSI depending on the elevator’s system design
If the car speed exceeds the rated contract speed and compresses the buffer, what
must be done after the test?
ANSWER Record the reset time, inspect the buffer for leakage or deformation,
and document test results per code.
What happens if you remove the interpoles when installing an SCR drive on a DC
motor?
ANSWER Commutation will suffer, causing excessive arcing and brush wear.
When replacing an MG (motor-generator) set with an SCR drive, what component
is typically removed from the system?
ANSWER The generator and its associated series loop resistors.
Conceptual Actual Emended Exam Questions
With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update
When retrofitting an old DC motor with an SCR drive, what should be done with
the interpoles?
ANSWER Leave the interpoles in place; they are still necessary for
commutation.
What is the maximum time allowed for a hydraulic buffer to return to full height
after a full-speed test?
ANSWER 90 seconds (per ASME A17.1)
What is the primary purpose of a hydraulic buffer in an elevator system?
ANSWER To absorb the kinetic energy of the car or counterweight during an
uncontrolled descent or overspeed event.
During a buffer test, you observe the buffer piston rising slowly after impact and
taking 120 seconds to reset. What’s the status?
ANSWER The buffer fails the code requirement and must be repaired or
replaced.
,What is the required relief valve setting for a hydraulic elevator system with a
working pressure of 450 PSI?
ANSWER 450 × 150% = 675 PSI
According to ASME A17.1, what pressure must the hydraulic system relief valve
not exceed?
ANSWER 150% of the system’s working pressure
What is the correct test procedure to verify buffer functionality during an
acceptance test?
ANSWER The car must be run at full speed into fully compressed buffers and
timing recorded for recovery.
What tool is used to verify the working pressure of a hydraulic system?
ANSWER Hydraulic pressure gauge attached to the main line or valve port.
The pressure gauge reads 400 PSI while the elevator is rising. What should the
relief valve be set to?
ANSWER No more than 600 PSI (400 × 1.5)
You are conducting a Category 1 test and must verify the relief valve. What do you
do?
ANSWER Manually override the valve to exceed working pressure and observe
the relief valve opening at the set limit.
, What component protects a hydraulic elevator from overpressure if the pump
continues running while the car is stalled?
ANSWER The relief valve
What happens if the hydraulic buffer is overfilled with oil?
ANSWER The buffer may fail to compress properly, increasing impact forces
and risking damage to the car or frame.
What is the typical PSI rating for a hydraulic test pump used during
commissioning?
ANSWER Between 500–3,000 PSI depending on the elevator’s system design
If the car speed exceeds the rated contract speed and compresses the buffer, what
must be done after the test?
ANSWER Record the reset time, inspect the buffer for leakage or deformation,
and document test results per code.
What happens if you remove the interpoles when installing an SCR drive on a DC
motor?
ANSWER Commutation will suffer, causing excessive arcing and brush wear.
When replacing an MG (motor-generator) set with an SCR drive, what component
is typically removed from the system?
ANSWER The generator and its associated series loop resistors.
