Gas Fitter Practice Test

What is the result of increasing the size of a blower pulley?

1. Increases air flow

2. Decreases air flow

3. Increases current flow

4. Decreases temperature rise

The correct answer is: Decreases air flow

Increasing the size of a blower pulley directly affects the blower's performance by changing its speed. When the pulley size is increased, it leads to a slower rotation of the blower, which results in a decrease in air flow produced by the blower. This happens because the larger pulley requires more torque to drive the same blower motor, ultimately reducing the speed at which the blower operates. A slower blower speed means less air is moved through the system, making it essential for gas fitters to understand the implications of pulley sizes on air flow and system efficiency. Understanding blower operation is crucial because maintaining the correct air flow ensures optimal performance of heating systems, ventilation, and air conditioning applications. An increase in the size of a blower pulley will typically not lead to increased current flow or a reduction in temperature rise, as those factors rely more on the efficiency and heat distribution of the system rather than just the pulley size.