CET Maintenance, Inspection & Troubleshooting 3

Question 1

A traction elevator's guide rails show excessive rust pitting. What is the PRIMARY concern with this condition?

Accepted Answer

Impaired safety engagement and car ride quality

Answer

Pitted rails can prevent the safety device from gripping uniformly, compromising emergency stopping performance and causing rough car movement.

Question 2

What does a negative or reverse phase relay protect against in an elevator system?

Accepted Answer

Incorrect motor rotation due to swapped power phases

Answer

A reverse phase relay detects incorrect phase sequence and prevents the motor from running in the wrong direction, which could cause the car to travel opposite the commanded direction.

Question 3

When performing a governor rope inspection, a technician finds broken wires in one strand. Per ASME A17.1, the rope must be replaced if broken wires exceed:

Accepted Answer

5% of the total wires in any rope lay

Answer

ASME A17.1 requires governor rope replacement when broken wires exceed the code-specified threshold, commonly 5% of total wires in one rope lay.

Question 4

An elevator's door operator motor runs but the doors do not move. The MOST likely cause is:

Accepted Answer

Broken or slipped door drive belt or chain

Answer

If the motor runs without moving the doors, the mechanical coupling (belt, chain, or coupler) between the motor and door mechanism has failed.

Question 5

A car position indicator shows the car at floor 4, but the car is physically between floors 3 and 4. This indicates a fault in the:

Accepted Answer

Position reference system or selector

Answer

A mismatch between displayed and actual position points to a fault in the position reference system, such as a missed vane, selector, or encoder pulse.

(CET) Certified Elevator Technician Practice Test

(CET) Certified Elevator Technician Practice Test

CET Maintenance, Inspection & Troubleshooting 3