1.11 Piping and Instrumentation

Which valve type is best suited for preventing backflow in a wastewater system?

• Butterfly valve

• Gate valve

• Check valve

• Diaphragm valve

Which check valve has a hinged disc that open to allow flow in one direction and closes to prevent backflow?

• Swing check valve

• Ball check valve

• Diaphragm check valve

• Spring check valve

What is the advantage of using a ball check valve in wastewater systems?

• Low pressure drop

• Tight seal under low pressure

• Minimal maintenance

• High flow capacity

What is the purpose of a modulating control valve in a wastewater system?

• To prevent backflow

• To provide emergency shut-off

• To regulate flow by adjusting position

• To release air pockets

Which control valve type is commonly used in wastewater systems to handle viscous fluids and slurries?

• Globe valve

• Ball valve

• Diaphragm valve

• Gate valve

What makes a solenoid valve or pneumatic actuator useful in automated wastewater systems?

• Remote operation

• Flow measurement

• Pressure regulation

• Corrosion resistance

What is the function of a foot valve in wastewater systems?

• To control flow rates

• To prevent siphoning

• To regulate pressure

• To reduce water hammer

What is the advantage of using an electrically actuated control valve in wastewater systems?

• Simple installation

• Manual control capability

• Quick response to control signals

• Resistance to corrosion

What is the primary function of a positioner in a control valve system?

• To provide emergency shut-off

• To monitor flow rates

• To prevent backflow

• To adjust the valve's opening

Which piping material is NOT recommended for use in areas with high UV exposure in wastewater operations?

• PVC

• FRP

• HDPE

• Ductile Iron