Red Seal Plumbing Practice Exam

What device controls the intervals at which effluent is discharged to a gravity fed distribution field?

1. Electric Timer

2. Bell and siphon

3. Gravity Switch

4. Manual Valve

The correct answer is: Bell and siphon

The electric timer (A) is incorrect because it controls the time intervals at which a device or system is on or off, not the discharge of effluent. The gravity switch (C) is incorrect because it is a type of sensor that detects changes in gravitational forces, not a device that controls effluent discharge. The manual valve (D) is incorrect because it is a simple on/off valve that is operated manually, not a controlled system for regulating effluent discharge intervals. The bell and siphon (B) is the correct answer because it is a device that uses a siphon to control the flow of effluent and discharge it at specific intervals, making it ideal for use in a gravity-fed distribution field.