Question 56General Subjects - QMED
70% to passWhich of the valves listed for the device shown in illustration will be open while the unit is operating in the back flush mode? Illustration GS-0153
Avalve "4"
Bvalves "4" and "5"
Cvalves "4" and "14"
Dvalves "4", "5", and "14"
AI Explanation
The correct answer is C) valves "4" and "14". When operating in the back flush mode, valves 4 and 14 need to be open to allow water to flow through the system in the reverse direction for cleaning purposes. Valve 4 allows water to enter the system, while valve 14 provides the exit path for the back flushing flow. The other answer choices are incorrect because valve 5 would typically be closed during back flushing, and having all three valves 4, 5, and 14 open is not the correct configuration for the back flush mode of operation.
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