Question

which of the following statements are true for fan hydraulic systems?

1. increasing current results in increasing fan speed
2. decreasing current results in decreasing fan speed
3. increasing current results in decreasing fan speed
4. decreasing current results in increasing fan speed

Explanation:

In fan hydraulic systems (often with electro - hydraulic control), the current is related to the control signal for the hydraulic pump or motor that drives the fan. Generally, an increase in current (which can be part of the electrical control to adjust the hydraulic power) leads to an increase in the power supplied to the fan - driving mechanism, thus increasing fan speed. Conversely, a decrease in current leads to a decrease in the power supplied, resulting in a decrease in fan speed. So statement 1 (Increasing current results in increasing fan speed) and statement 2 (Decreasing current results in decreasing fan speed) are true. Statement 3 says increasing current decreases fan speed, which is opposite to the expected relationship. Statement 4 says decreasing current increases fan speed, which is also opposite.

Answer:

1. Increasing current results in increasing fan speed, 2) Decreasing current results in decreasing fan speed