QUESTIONS AND A NEW UPDATED STUDY GUIDE COMPLETE
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APPROVED FINAL EXAM
What is the primary purpose of a governor on a traction elevator?
A. To control the acceleration rate
B. To limit the car speed and activate safeties if over speed occurs
C. To regulate door closing speed
D. To provide emergency lighting
CORRECT ANSWER: B
Rationale: The governor is a mechanical over speed safety device that senses car
speed. If the car exceeds a predetermined threshold (typically 115% of rated
speed), it mechanically trips the safety device on the car, stopping the elevator.
Which type of elevator machine is most commonly used in high-rise buildings for
medium to high speeds?
A. Hydraulic
B. Worm-gear traction
C. Gearless traction
D. Drum
CORRECT ANSWER: C
Rationale: Gearless traction machines have the sheave directly coupled to the
motor shaft, eliminating gear losses and allowing speeds up to 2000 FPM or more,
making them ideal for high-rise applications.
,In a hydraulic elevator, what component prevents the car from falling if the hoist
way valve fails to close?
A. Plunger gripper
B. Rupture valve
C. Relief valve
D. Check valve
CORRECT ANSWER: A
Rationale: A plunger gripper (or safety catch) mechanically locks the plunger in
place if uncontrolled descent occurs, typically due to a failed hoist way valve,
preventing a free fall.
According to ASME A17.1, the minimum illumination at the car floor level for an
elevator car shall be:
A. 5 lux
B. 10 lux
C. 50 lux
D. 100 lux
CORRECT ANSWER: C
Rationale: ASME A17.1 requires a minimum of 50 luces (approximately 5 foot-
candles) measured at the car floor level to ensure safe operation and emergency
egress.
What is the function of a phase reversal relay on an elevator controller?
A. To prevent the motor from running backwards due to incorrect phase sequence
B. To reverse the motor direction for down travel
C. To switch from normal to emergency power
D. To disconnect the battery charger
,CORRECT ANSWER: A
Rationale: A phase reversal relay monitors the incoming AC power phase
sequence. If phases are reversed, it prevents the controller from operating, avoiding
unsafe motor direction or brake operation.
What type of elevator door operator is most common for high-speed automatic
elevators?
A. Mechanical linear actuator
B. Hydraulic door operator
C. Electric motor with belt or chain drive and a clutch
D. Pneumatic cylinder
CORRECT ANSWER: C
Rationale: Electric door operators using a motor, belt/chain drive, and a clutch
mechanism provide precise speed and torque control, necessary for high-speed
automatic operation and door reopening features.
The buffer at the bottom of an elevator hoist way is designed to:
A. Level the car precisely at floors
B. Absorb the kinetic energy of the car or counterweight during an over speed or
over travel event
C. Guide the car rails
D. Reduce noise from the traveling cable
CORRECT ANSWER: B
Rationale: Buffers (oil or spring) are energy‑absorbing devices that safely stop the
car or counterweight if it overruns the normal stopping limits, protecting occupants
and equipment.
What does the term “plunger” refer to in a direct hydraulic elevator?
, A. The movable piston that extends into the cylinder to raise the car
B. The control valve that directs oil flow
C. The electric motor driving the pump
D. The cylinder head seal
CORRECT ANSWER: A
Rationale: In a direct hydraulic elevator, the plunger is the moving piston attached
to the car; oil pressure applied to the cylinder extends the plunger, raising the car.
Which code is the primary safety standard for elevators and escalators in the
United States?
A. NFPA 70 (NEC)
B. ASME A17.1/CSA B44
C. OSHA 1910
D. ICC IBC
CORRECT ANSWER: B
Rationale: ASME A17.1 (Safety Code for Elevators and Escalators), harmonized
with CSA B44, is the adopted standard across most U.S. jurisdictions regulating
elevator safety.
When troubleshooting a relay logic controller, a technician finds that the car runs
only in the up direction. The most likely cause is:
A. A defective down relay or contact
B. A faulty motor brake
C. Low oil in the hydraulic reservoir
D. A stuck door lock contact
CORRECT ANSWER: A