QEI Traction Drive Systems and Wire Rope

Question 1

What is the minimum number of wire ropes or chains required for a traction elevator under ASME A17.1?

Accepted Answer

Two

Answer

One

Answer

Three

Answer

Four

Question 2

Which type of traction machine uses a worm gear to transmit power from the motor to the sheave?

Accepted Answer

Geared traction machine

Answer

Gearless traction machine

Answer

Hydraulic drive unit

Answer

Linear induction motor

Question 3

What condition requires the immediate removal of a wire rope from service according to ASME A17.1?

Accepted Answer

Six or more broken wires in one rope lay

Answer

Minor surface rust

Answer

One broken wire in the entire rope

Answer

Slight kinking near the hitch

Question 4

What is the purpose of the secondary sheave (deflector sheave) in a traction elevator roping system?

Accepted Answer

To redirect the ropes to achieve the correct geometry between the car and counterweight

Answer

To provide additional traction

Answer

To tension the governor rope

Answer

To absorb vibration from the drive motor

Question 5

In a 2:1 roping arrangement, how does the car speed compare to the rope speed at the drive sheave?

Accepted Answer

Car speed is half the rope speed

Answer

Car speed equals rope speed

Answer

Car speed is twice the rope speed

Answer

Car speed is four times the rope speed

Question 6

What is the function of the rope equalizer in a traction elevator?

Accepted Answer

To distribute load evenly among all hoist ropes

Answer

To measure rope tension electronically

Answer

To prevent rope oscillation during travel

Answer

To anchor the rope to the crosshead