CO Elevator Mechanic Contractor
Exam Practice Questions And Correct
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1. Which component is primarily responsible for preventing an
elevator car from exceeding its normal downward travel speed
when the governor detects an overspeed condition?
A. Counterweight sheave
B. Door operator
C. Safety gear
D. Traveling cable
Answer: C. Safety gear
The elevator safety gear is designed to engage the guide rails when an
overspeed condition is detected, helping stop or restrain the car and
protect occupants from uncontrolled descent.
2. What is the primary function of an elevator governor?
A. Control cab lighting
B. Detect overspeed and initiate the safety system
,C. Regulate hydraulic oil temperature
D. Operate the landing doors
Answer: B. Detect overspeed and initiate the safety system
The governor monitors elevator speed and, when the predetermined
tripping speed is reached, activates mechanisms that cause the car
safety system to engage.
3. In a traction elevator, what is the primary purpose of the
counterweight?
A. Increase door-opening speed
B. Balance a substantial portion of the car and load weight
C. Prevent the governor rope from moving
D. Provide emergency lighting power
Answer: B. Balance a substantial portion of the car and load weight
The counterweight reduces the amount of motor power required by
balancing the weight of the car plus a specified portion of its rated load.
4. Which component provides the frictional contact necessary to
transmit torque from the traction machine to the hoist ropes?
A. Deflector roller
B. Governor
C. Traction sheave
D. Guide shoe
Answer: C. Traction sheave
,The traction sheave has grooves that grip the hoist ropes sufficiently to
transfer motor torque and move the elevator car and counterweight.
5. What is the principal purpose of elevator guide rails?
A. Carry electrical power to the car
B. Guide the car and counterweight along a controlled vertical path
C. Lubricate the hoist ropes
D. Support the machine-room ventilation system
Answer: B. Guide the car and counterweight along a controlled vertical
path
Guide rails provide the rigid running surfaces that maintain the
alignment and controlled movement of the elevator car and
counterweight.
6. Which device normally prevents an elevator from moving unless the
hoistway doors and car door or gate are properly closed and locked?
A. Door interlock system
B. Governor sheave
C. Buffer switch
D. Counterweight frame
Answer: A. Door interlock system
Door interlocks are safety devices that establish the required electrical
and mechanical conditions before the elevator can operate with the
doors secured.
7. What is the primary purpose of an elevator buffer?
, A. Increase traction
B. Absorb energy if the car or counterweight travels into the pit beyond its
normal limits
C. Control door reopening
D. Prevent rope corrosion
Answer: B. Absorb energy if the car or counterweight travels into the pit
beyond its normal limits
Buffers are installed in the pit to absorb and dissipate energy during an
unintended overtravel condition involving the car or counterweight.
8. Which type of buffer generally uses a spring mechanism to absorb
impact energy?
A. Oil buffer
B. Hydraulic buffer
C. Spring buffer
D. Pneumatic governor
Answer: C. Spring buffer
Spring buffers use mechanical springs to absorb and dissipate impact
energy and are commonly associated with elevators within the speed
limitations established by the applicable code.
9. What is the principal function of a hydraulic elevator jack?
A. Rotate the traction sheave
B. Convert hydraulic pressure into linear movement of the elevator
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. Which component is primarily responsible for preventing an
elevator car from exceeding its normal downward travel speed
when the governor detects an overspeed condition?
A. Counterweight sheave
B. Door operator
C. Safety gear
D. Traveling cable
Answer: C. Safety gear
The elevator safety gear is designed to engage the guide rails when an
overspeed condition is detected, helping stop or restrain the car and
protect occupants from uncontrolled descent.
2. What is the primary function of an elevator governor?
A. Control cab lighting
B. Detect overspeed and initiate the safety system
,C. Regulate hydraulic oil temperature
D. Operate the landing doors
Answer: B. Detect overspeed and initiate the safety system
The governor monitors elevator speed and, when the predetermined
tripping speed is reached, activates mechanisms that cause the car
safety system to engage.
3. In a traction elevator, what is the primary purpose of the
counterweight?
A. Increase door-opening speed
B. Balance a substantial portion of the car and load weight
C. Prevent the governor rope from moving
D. Provide emergency lighting power
Answer: B. Balance a substantial portion of the car and load weight
The counterweight reduces the amount of motor power required by
balancing the weight of the car plus a specified portion of its rated load.
4. Which component provides the frictional contact necessary to
transmit torque from the traction machine to the hoist ropes?
A. Deflector roller
B. Governor
C. Traction sheave
D. Guide shoe
Answer: C. Traction sheave
,The traction sheave has grooves that grip the hoist ropes sufficiently to
transfer motor torque and move the elevator car and counterweight.
5. What is the principal purpose of elevator guide rails?
A. Carry electrical power to the car
B. Guide the car and counterweight along a controlled vertical path
C. Lubricate the hoist ropes
D. Support the machine-room ventilation system
Answer: B. Guide the car and counterweight along a controlled vertical
path
Guide rails provide the rigid running surfaces that maintain the
alignment and controlled movement of the elevator car and
counterweight.
6. Which device normally prevents an elevator from moving unless the
hoistway doors and car door or gate are properly closed and locked?
A. Door interlock system
B. Governor sheave
C. Buffer switch
D. Counterweight frame
Answer: A. Door interlock system
Door interlocks are safety devices that establish the required electrical
and mechanical conditions before the elevator can operate with the
doors secured.
7. What is the primary purpose of an elevator buffer?
, A. Increase traction
B. Absorb energy if the car or counterweight travels into the pit beyond its
normal limits
C. Control door reopening
D. Prevent rope corrosion
Answer: B. Absorb energy if the car or counterweight travels into the pit
beyond its normal limits
Buffers are installed in the pit to absorb and dissipate energy during an
unintended overtravel condition involving the car or counterweight.
8. Which type of buffer generally uses a spring mechanism to absorb
impact energy?
A. Oil buffer
B. Hydraulic buffer
C. Spring buffer
D. Pneumatic governor
Answer: C. Spring buffer
Spring buffers use mechanical springs to absorb and dissipate impact
energy and are commonly associated with elevators within the speed
limitations established by the applicable code.
9. What is the principal function of a hydraulic elevator jack?
A. Rotate the traction sheave
B. Convert hydraulic pressure into linear movement of the elevator
