QEI Traction Drive Systems and Wire Rope 2

Question 1

What parameter must a QEI inspector verify when checking drive sheave groove condition?

Accepted Answer

Groove wear and undercut depth relative to manufacturer limits

Answer

Inspectors must measure sheave groove wear and undercut to ensure ropes seat properly and traction is maintained within manufacturer and code limits.

Question 2

Which test verifies that the elevator braking system can hold the car with its rated load?

Accepted Answer

Brake torque test

Answer

The brake torque test confirms the elevator brake can hold the car stationary with full rated load applied, as required by ASME A17.1.

Question 3

What is the ASME A17.1 requirement for traction elevator counterweight balance relative to the car?

Accepted Answer

Counterweight equals car weight plus 40% to 50% of rated load

Answer

ASME A17.1 requires the counterweight to equal the empty car weight plus 40–50% of rated capacity to optimize traction and energy efficiency.

Question 4

What does a 'traction loss' condition occur when in a traction elevator?

Accepted Answer

The friction between the hoist ropes and drive sheave is insufficient to move the car

Answer

Traction loss occurs when the friction force between the hoist ropes and sheave grooves cannot overcome the load difference, causing the ropes to slip.

Question 5

Under ASME A17.1, what is the minimum factor of safety required for elevator hoist ropes?

Accepted Answer

10

Answer

ASME A17.1 specifies a minimum factor of safety of 10 for elevator wire ropes used in passenger and freight elevators.

QEI - Qualified Elevator Inspector Practice Test

QEI - Qualified Elevator Inspector Practice Test

QEI Traction Drive Systems and Wire Rope 2