Elevator Mechanic Practice Exam

What is the purpose of a gear reduction unit on a geared machine?

1. Decrease speed

2. Increased lifting capacity

3. Reduce noise

4. Provide smoother operation

The correct answer is: Increased lifting capacity

The gear reduction unit on a geared machine primarily serves to decrease the speed of the output shaft while simultaneously increasing the torque. This is particularly important in applications such as elevators, where a controlled, reduced speed is essential for safe and efficient operation. By allowing the motor to run at higher speeds while the gear reduction unit slows down the output, the system is able to lift heavier loads more effectively—hence, enhancing lifting capacity. The other options address potential advantages that a gear reduction unit may contribute to a degree—such as smoother operation or reduced noise—but they do not encapsulate the core mechanical function of the unit as accurately as increasing lifting capacity through speed reduction and torque enhancement.